Patent Application
20180016502
The present invention relates to optically anisotropic polymers having various optical properties, to polymerizable compositions useful for components of films, to optically anisotropic bodies, retardation films, optical compensation films, antireflective films, lenses, and lens sheets that are composed of the polymerizable compositions, and to liquid crystal display devices, organic light-emitting display devices, lighting devices, optical components, polarizing films, coloring agents, security markings, laser light-emitting components, printed materials, etc. that use the polymerizable compositions.
Compounds having polymerizable groups (polymerizable compounds) are used for various optical materials. For example, by aligning a polymerizable composition containing a polymerizable compound into a liquid crystal state and then polymerizing the resulting polymerizable composition, a polymer with uniform alignment can be produced. Such a polymer can be used for polarizing plates, retardation plates, etc. necessary for displays. In many cases, polymerizable compositions containing two or more polymerizable compounds are used in order to meet the required optical properties, polymerization rate, solubility, melting point, glass transition temperature, transparency of polymers, mechanical strength, surface hardness, heat resistance, and light fastness. It is necessary for the polymerizable compounds used to provide good physical properties to the polymerizable compositions without adversely affecting other characteristics.
To improve the viewing angle of liquid crystal displays, it is necessary for retardation films to show birefringence with weak or reverse wavelength dispersion. Various polymerizable liquid crystal compounds with reverse or weak wavelength dispersion have been developed as the materials of these retardation films. When these polymerizable compounds are added to polymerizable compositions, crystals are precipitated, so that the storage stability of the polymerizable compositions is insufficient (PTL 1).
Another problem with these polymerizable compounds is that when the polymerizable compositions are applied to substrates and polymerized, unevenness easily occurs (PTL 1 to PTL 3). When a polymerizable compound with poor solubility is used, it is very difficult to prevent uneven application because usable solvents are limited. When an uneven film is used for, for example, a display, a problem arises in that the quality of the display product deteriorates significantly because of unevenness in display brightness or unnatural color tone. There is therefore a need for the development of a polymerizable liquid crystal compound that is excellent in solubility, has reverse or weak wavelength dispersion, and can therefore solve the above problems. Moreover, an important technique when a polymerizable compound is applied to a film substrate is to select a solvent that causes less attack on the substrate, in order to obtain prescribed alignment.
PTL 1: Japanese Unexamined Patent Application Publication No. 2008-107767
PTL 2: Japanese Unexamined Patent Application Publication (Translation of PCT Application) No. 2010-522892
PTL 3: Japanese Unexamined Patent Application Publication (Translation of PCT Application) No. 2013-509458
An object of the present invention is to provide a polymerizable composition that is excellent in solubility, causes no precipitation of crystals, and has high storage stability. When the polymerizable composition provided is polymerized to produce a film-shaped polymerized product, uneven application is unlikely to occur. Other objects of the invention are to provide optically anisotropic bodies, retardation films, optical compensation films, antireflective films, lenses, and lens sheets that are composed of the polymerizable composition and to provide liquid crystal display devices, organic light-emitting display devices, lighting devices, optical components, coloring agents, security markings, laser light-emitting components, polarizing films, coloring materials, printed materials, etc. that use the polymerizable composition.
In the present invention, to achieve the above objects, extensive studies have been conducted with attention paid to polymerizable compositions that use a specific organic solvent and a specific polymerizable compound having one or two or more polymerizable groups. As a result of the extensive studies, the present invention is provided.
Accordingly, the present invention provides a polymerizable composition comprising:
a) a polymerizable compound having one or two or more polymerizable groups and satisfying formula (I)
Re(450 nm)/Re(550 nm)<1.0 (I)
(wherein Re(450 nm) is an in-plane retardation at a wavelength of 450 nm when the polymerizable compound having or two or more polymerizable groups is aligned on a substrate such that the direction of long axes of molecules of the polymerizable compound is substantially horizontal to the substrate, and Re(550 nm) is an in-plane retardation at a wavelength of 550 nm when the polymerizable compound having one or two or more polymerizable groups is aligned on the substrate such that the direction of the long axes of the molecules of the polymerizable compound is substantially horizontal to the substrate); and
b) an organic solvent having a solubility parameter (SP value) of 8.50 to 11.00 (cal/cm3)0.5, a boiling point of 75 to 180° C., and an evaporation rate index of 20 to 700.
Moreover, the present invention provides an optically anisotropic body, a retardation film, an optical compensation film, an antireflective film, a lens, and a lens sheet that are composed of the polymerizable composition and also provides a liquid crystal display device, an organic light-emitting display device, a lighting device, an optical component, a coloring agent, a security marking, a laser light-emitting component, a printed material, etc. that use the polymerizable composition.
The polymerizable composition of the present invention uses the specific polymerizable compound having one or two or more polymerizable groups simultaneously with the organic solvent having a solubility parameter (SP value) of 8.50 to 11.00 (cal/cm3)0.5, a boiling point of 75 to 180° C., and an evaporation rate index of 20 to 700. This allows the polymerizable composition obtained to have excellent solubility and excellent storage stability and also allows provision of polymers, optically anisotropic bodies, retardation films, etc. that have coating surfaces with small unevenness and have high productivity.
Best modes of the polymerizable composition according to the present invention will next be described. In the present invention, the “liquid crystalline compound” is intended to mean a compound having a mesogenic skeleton, and it is not necessary for the compound alone to exhibit liquid crystallinity. The polymerizable composition can be polymerized (formed into a film) through polymerization treatment by irradiation with light such as UV rays or heating.
The polymerizable compound having one or two or more polymerizable groups in the present invention is characterized in that the birefringence of the compound is lager on a long-wavelength side than on a short-wavelength side within the visible range. Specifically, it is only necessary that formula (I):
Re(450 nm)/Re(550 nm)<1.0 (I)
be satisfied (wherein Re(450 nm) is an in-plane retardation at a wavelength of 450 nm when the polymerizable compound having one or two or more polymerizable groups is aligned on a substrate such that the direction of the long axes of molecules of the polymerizable compound is substantially horizontal to the substrate, and Re(550 nm) is an in-plane retardation at a wavelength of 550 nm when the polymerizable compound having one or two or more polymerizable groups is aligned on the substrate such that the direction of the long axes of the molecules of the polymerizable compound is substantially horizontal to the substrate). It is not necessary that the birefringence be larger on the long-wavelength side than on the short-wavelength side within the ultraviolet and infrared ranges.
The above compound is preferably a liquid crystalline compound. In particular, it is preferable that the compound comprises at least one of liquid crystalline compounds represented by general formulas (1) to (7).
(In the above formulas, P11 to P74 each represent a polymerizable group; S11 to S72 each represent a spacer group or a single bond; when a plurality of S11s to S72s are present, they may be the same or different;
X11 to X72 each represent —O—, —S—, —OCH2—, —CH2O—, —CO—, —COO—, —OCO—, —CO—S—, —S—CO—, —O—CO—O—, —CO—NH—, —NH—CO—, —SCH2—, —CH2S—, —CF2O—, —OCF2—, —CF2S—, —SCF2—, —CH═CH—COO—, —CH═CH—OCO—, —COO—CH═CH—, —OCO—CH═CH—, —COO—CH2CH2—, —OCO—CH2CH2—, —CH2CH2—COO—, —CH2CH2—OCO—, —COO—CH2—, —OCO—CH2—, —CH2—COO—, —CH2—OCO—, —CH═CH—, —N═N—, —CH═N—N═CH—, —CF═CF—, —C≡C—, or a single bond (provided that each P—(S—X)— bond contains no —O—O—); when a plurality of X11s to X72s are present, they may be the same or different;
MG11 to MG71 each independently represent formula (a):
(wherein A11 and A12 each independently represent a 1,4-phenylene group, a 1,4-cyclohexylene group, a pyridine-2,5-diyl group, a pyrimidine-2,5-diyl group, a naphthalene-2,6-diyl group, a naphthalene-1,4-diyl group, a tetrahydronaphthalene-2,6-diyl group, a decahydronaphthalene-2,6-diyl group, or a 1,3-dioxane-2,5-diyl group, each of which may be unsubstituted or substituted by at least one L1; when a plurality of A11s and/or A12s are present, they may be the same or different;
Z11 and Z12 each independently represent —O—, —S—, —OCH2—, —CH2O—, —CH2CH2—, —CO—, —COO—, —OCO—, —CO—S—, —S—CO—, —O—CO—O—, —CO—NH—, —NH—CO—, —SCH2—, —CH2S—, —CF2O—, —OCF2—, —CF2S—, —SCF2—, —CH═CH—COO—, —CH═CH—OCO—, —COO—CH═CH—, —OCO—CH═CH—, —COO—CH2CH2—, —OCO—CH2CH2—, —CH2CH2—COO—, —CH2CH2—OCO—, —COO—CH2—, —OCO—CH2—, —CH2—COO—, —CH2—OCO—, —CH═CH—, —N═N—, —CH═N—, —N═CH—, —CH═N—N═CH—, —CF═CF—, —C≡C—, or a single bond; when a plurality of Z11s and/or Z12s are present, they may be the same or different;
M represents a group selected from formula (M-1) to formula (M-11) below:
the groups represented by formula (M-1) to formula (M-11) may be unsubstituted or substituted by at least one L1;
G is one of formula (G-1) to formula (G-6) below:
(wherein R3 represents a hydrogen atom or an alkyl group having 1 to 20 carbon atoms, the alkyl group being linear or branched, any hydrogen atom in the alkyl group being optionally replaced by a fluorine atom, one —CH2— group or two or more nonadjacent —CH2— groups in the alkyl group being each independently optionally replaced by —O—, —S—, —CO—, —COO—, —OCO—, —CO—S—, —S—CO—, —O—CO—O—, —CO—NH—, —NH—CO—, or —C≡C—;
W81 represents a group that has at least one aromatic group and has 5 to 30 carbon atoms and that may be unsubstituted or substituted by at least one L1;
W82 represents a hydrogen atom or an alkyl group having 1 to 20 carbon atoms, the alkyl group being linear or branched, any hydrogen atom in the alkyl group being optionally replaced by a fluorine atom, one —CH2— group or two or more nonadjacent —CH2— groups in the alkyl group being each independently optionally replaced by —O—, —S—, —CO—, —COO—, —OCO—, —CO—S—, —S—CO—, —O—CO—O—, —CO—NH—, —NH—CO—, —CH═CH—COO—, —CH═CH—OCO—, —COO—CH═CH—, —OCO—CH═CH—, —CH═CH—, —CF═CF—, or —C≡C—; the meaning of W82 may be the same as the meaning of W81; W81 and W82 may be bonded together to form a single ring structure; alternatively, W82 represents the following group:
(wherein the meaning of PW82 is the same as the meaning of P11; the meaning of SW82 is the same as the meaning of S11; the meaning of XW82 is the same as the meaning of X11; and the meaning of nW82 is the same as the meaning of m11);
W83 and W84 are each independently a halogen atom, a cyano group, a hydroxy group, a nitro group, a carboxyl group, a carbamoyloxy group, an amino group, a sulfamoyl group, a group having at least one aromatic group and having 5 to 30 carbon atoms, an alkyl group having 1 to 20 carbon atoms, a cycloalkyl group having 3 to 20 carbon atoms, an alkenyl group having 2 to 20 carbon atoms, a cycloalkenyl group having 3 to 20 carbon atoms, an alkoxy group having 1 to 20 carbon atoms, an acyloxy group having 2 to 20 carbon atoms, or an alkylcarbonyloxy group having 2 to 20 carbon atoms, one —CH2— group or two or more nonadjacent —CH2— groups in each of the alkyl group, the cycloalkyl group, the alkenyl group, the cycloalkenyl group, the alkoxy group, the acyloxy group, and the alkylcarbonyloxy group being each independently optionally replaced by —O—, —S—, —CO—, —COO—, —OCO—, —CO—S—, —S—CO—, —O—CO—O—, —CO—NH—, —NH—CO—, or —C≡C—; when M is selected from formula (M-1) to formula (M-10), G is selected from formula (G-1) to formula (G-5); when M represents formula (M-11), G represents formula (G-6);
L1 represents a fluorine atom, a chlorine atom, a bromine atom, an iodine atom, a pentafluorosulfuranyl group, a nitro group, an isocyano group, an amino group, a hydroxyl group, a mercapto group, a methylamino group, a dimethylamino group, a diethylamino group, a diisopropylamino group, a trimethylsilyl group, a dimethylsilyl group, a thioisocyano group, or an alkyl group having 1 to 20 carbon atoms, the alkyl group being linear or branched, any hydrogen atom in the alkyl group being optionally replaced by a fluorine atom, one —CH2— group or two or more nonadjacent —CH2— groups in the alkyl group being each independently optionally replaced by a group selected from —O—, —S—, —CO—, —COO—, —OCO—, —CO—S—, —S—CO—, —O—CO—O—, —CO—NH—, —NH—CO—, —CH═CH—COO—, —CH═CH—OCO—, —COO—CH═CH—, —OCO—CH═CH—, —CH═CH—, —CF═CF—, and —C≡C—; when a plurality of L1s are present in the compound, they may be the same or different;
j11 represents an integer from 1 to 5; and j12 represents an integer of 1 to 5 while j11+j12 is an integer from 2 to 5); R11 and R31 each represent a hydrogen atom, a fluorine atom, a chlorine atom, a bromine atom, an iodine atom, a pentafluorosulfuranyl group, a cyano group, a nitro group, an isocyano group, a thioisocyano group, or an alkyl group having 1 to 20 carbon atoms, the alkyl group being linear or branched, any hydrogen atom in the alkyl group being optionally replaced by a fluorine atom, one —CH2— group or two or more nonadjacent —CH2— groups in the alkyl group being each independently optionally replaced by —O—, —S—, —CO—, —COO—, —OCO—, —CO—S—, —S—CO—, —O—CO—O—, —CO—NH—, —NH—CO—, or —C≡C—; m11 represents an integer of 0 to 8; and m2 to m7, n2 to n7, 14 to 16, and k6 each independently represent an integer from 0 to 5.)
In general formula (1) to general formula (7), it is preferable that the polymerizable groups P11 to P74 each represent a group selected from formula (P-1) to formula (P-20) below:
These polymerizable groups are polymerized by radical polymerization, radical addition polymerization, cationic polymerization, or anionic polymerization. In particular, when the polymerization method is UV polymerization, formula (P-1), formula (P-2), formula (P-3), formula (P-4), formula (P-5), formula (P-7), formula (P-11), formula (P-13), formula (P-15), or formula (P-18) is preferable, and formula (P-1), formula (P-2), formula (P-7), formula (P-11), or formula (P-13) is more preferable. Formula (P-1), formula (P-2), or formula (P-3) is still more preferable, and formula (P-1) or formula (P-2) is particularly preferable.
In general formula (1) to general formula (7), S11 to S72 each represent a spacer group or a single bond. When a plurality of S11s to S72s are present, they may be the same or different. Preferably, the spacer group represents an alkylene group which has 1 to 20 carbon atoms and in which one —CH2— group or two or more nonadjacent —CH2— groups may be each independently replaced by —O—, —COO—, —OCO—, —OCO—O—, —CO—NH—, —NH—CO—, —CH═CH—, —C≡C—, or formula (S-1) below:
When a plurality of S's are present, they may be the same or different and more preferably each independently represent a single bond or an alkylene group which has 1 to 10 carbon atoms and in which one —CH2— group or two or more nonadjacent —CH2— groups may be each independently replaced by —O—, —COO—, or —OCO—, in terms of availability of raw materials and ease of synthesis. Still more preferably, S11 to S72 each independently represent a single bond or an alkylene group having 1 to 10 carbon atoms. When a plurality of S's are present, they may be the same or different and particularly preferably each independently represent an alkylene group having 1 to 8 carbon atoms.
In general formula (1) to general formula (7), X11 to X72 each represent —O—, —S—, —OCH2—, —CH2O—, —CO—, —COO—, —OCO—, —CO—S—, —S—CO—, —O—CO—O—, —CO—NH—, —NH—CO—, —SCH2—, —CH2S—, —CF2O—, —OCF2—, —CF2S—, —SCF2—, —CH═CH—COO—, —CH═CH—OCO—, —COO—CH═CH—, —OCO—CH═CH—, —COO—CH2CH2—, —OCO—CH2CH2—, —CH2CH2—COO—, —CH2CH2—OCO—, —COO—CH2—, —OCO—CH2—, —CH2—COO—, —CH2—OCO—, —CH═CH—, —N═N—, —CH═N—N═CH—, —CF═CF—, —C≡C—, or a single bond (provided that each P—(S—X)— bond contains no —O—O—). When a plurality of X11s to X7s are present, they may be the same or different. When a plurality of X11s to X72s are present, they may be the same or different, preferably each independently represent —O—, —S—, —OCH2—, —CH2O—, —COO—, —OCO—, —CO—S—, —S—CO—, —O—CO—O—, —CO—NH—, —NH—CO—, —COO—CH2CH2—, —OCO—CH2CH2—, —CH2CH2—COO—, —CH2CH2—OCO—, or a single bond, and more preferably each independently represent —O—, —OCH2—, —CH2O—, —COO—, —OCO—, —COO—CH2CH2—, —OCO—CH2CH2—, —CH2CH2—COO—, —CH2CH2—OCO—, or a single bond, in terms of availability of raw materials and ease of synthesis. When a plurality of X11s to X72s are present, they may be the same or different and particularly preferably each independently represent —O—, —COO—, —OCO—, or a single bond.
In general formula (1) to general formula (7), A11 and A12 each independently represent a 1,4-phenylene group, a 1,4-cyclohexylene group, a pyridine-2,5-diyl group, a pyrimidine-2,5-diyl group, a naphthalene-2,6-diyl group, a naphthalene-1,4-diyl group, a tetrahydronaphthalene-2,6-diyl group, a decahydronaphthalene-2,6-diyl group, or a 1,3-dioxane-2,5-diyl group, each of which may be unsubstituted or substituted by at least one L. When a plurality of A11s and/or A12s are present, they may be the same or different. In terms of availability of raw materials and ease of synthesis, A11 and A12 preferably each independently represent a 1,4-phenylene group, a 1,4-cyclohexylene group, or naphthalene-2,6-diyl, each of which may be unsubstituted or substituted by at least one L1, more preferably each independently represent a group selected from formula (A-1) to formula (A-11) below:
still more preferably each independently represent a group selected from formula (A-1) to formula (A-8), and particularly preferably each independently represent a group selected from formula (A-1) to formula (A-4).
In general formula (1) to general formula (7), Z11 and Z12 each independently represent —O—, —S—, —OCH2—, —CH2O—, —CH2CH2—, —CO—, —COO—, —OCO—, —CO—S—, —S—CO—, —O—CO—O—, —CO—NH—, —NH—CO—, —OCO—NH—, —NH—COO—, —NH—CO—NH—, —NH—O—, —O—NH—, —SCH2—, —CH2S—, —CF2O—, —OCF2—, —CF2S—, —SCF2—, —CH═CH—COO—, —CH═CH—OCO—, —COO—CH═CH—, —OCO—CH═CH—, —COO—CH2CH2—, —OCO—CH2CH2—, —CH2CH2—COO—, —CH2CH2—OCO—, —COO—CH2—, —OCO—CH2—, —CH2—COO—, —CH2—OCO—, —CH═CH—, —N═N—, —CH═N—, —N═CH—, —CH═N—N═CH—, —CF═CF—, —C≡C—, or a single bond. When a plurality of Z11s and/or Z12s are present, they may be the same or different. In terms of the liquid crystallinity of the compound, availability of raw materials, and ease of synthesis, Z11 and Z12 preferably each independently represent a single bond, —OCH2—, —CH2O—, —COO—, —OCO—, —CF2O—, —OCF2—, —CH2CH2—, —CF2CF2—, —CH═CH—COO—, —CH═CH—OCO—, —COO—CH═CH—, —OCO—CH═CH—, —COO—CH2CH2—, —OCO—CH2CH2—, —CH2CH2—COO—, —CH2CH2—OCO—, —CH═CH—, —CF═CF—, —C≡C—, or a single bond, more preferably each independently represent —OCH2—, —CH2O—, —CH2CH2—, —COO—, —OCO—, —COO—CH2CH2—, —OCO—CH2CH2—, —CH2CH2—COO—, —CH2CH2—OCO—, —CH═CH—, —C≡C—, or a single bond, still more preferably each independently represent —CH2CH2—, —COO—, —OCO—, —COO—CH2CH2—, —OCO—CH2CH2—, —CH2CH2—COO—, —CH2CH2—OCO—, or a single bond, and particularly preferably each independently represent —CH2CH2—, —COO—, —OCO—, or a single bond.
In general formula (1) to general formula (7), M represents a group selected from formula (M-1) to formula (M-11) below:
These groups may be unsubstituted or substituted by at least one L1. In terms of availability of raw materials and ease of synthesis, M preferably represents a group selected from formula (M-1) and formula (M-2) that may be each independently unsubstituted or substituted by at least one L1 and formula (M-3) to formula (M-6) that are unsubstituted, more preferably represents a group selected from formula (M-1) and formula (M-2) that may be unsubstituted or substituted by at least one L1, and particularly preferably represents a group selected from formula (M-1) and formula (M-2) that are unsubstituted.
In general formula (1) to general formula (7), R2 and R31 each represent a hydrogen atom, a fluorine atom, a chlorine atom, a bromine atom, an iodine atom, a pentafluorosulfuranyl group, a cyano group, a nitro group, an isocyano group, a thioisocyano group, or a linear or branched alkyl group which has 1 to 20 carbon atoms and in which one —CH2— group or two or more nonadjacent —CH2— groups may be each independently replaced by —O—, —S—, —CO—, —COO—, —OCO—, —CO—S—, —S—CO—, —O—CO—O—, —CO—NH—, —NH—CO—, or —C≡C—, and any hydrogen atom in the alkyl group may be replaced by a fluorine atom. In terms of liquid crystallinity and ease of synthesis, R1 preferably represents a hydrogen atom, a fluorine atom, a chlorine atom, a cyano group, or a linear or branched alkyl group which has 1 to 12 carbon atoms and in which one —CH2— group or two or more nonadjacent —CH2— groups may be each independently replaced by —O—, —COO—, —OCO—, or —O—CO—O—. R1 more preferably represents a hydrogen atom, a fluorine atom, a chlorine atom, a cyano group, a linear alkyl group having 1 to 12 carbon atoms, or a linear alkoxy group having 1 to 12 carbon atoms and particularly preferably represents a linear alkyl group having 1 to 12 carbon atoms or a linear alkoxy group having 1 to 12 carbon atoms.
In general formula (1) to general formula (7), G represents a group selected from formula (G-1) to formula (G-6):
In these formulas, R3 represents a hydrogen atom or an alkyl group having 1 to 20 carbon atoms. The alkyl group may be linear or branched, and any hydrogen atom in the alkyl group may be replaced by a fluorine atom. One —CH2— group or two or more nonadjacent —CH2— groups in the alkyl group may be each independently replaced by —O—, —S—, —CO—, —COO—, —OCO—, —CO—S—, —S—CO—, —O—CO—O—, —CO—NH—, —NH—CO—, or —C≡C—. W81 represents a group that has at least one aromatic group and has 5 to 30 carbon atoms and that may be unsubstituted or substituted by at least one L1. W82 represents a hydrogen atom or an alkyl group having 1 to 20 carbon atoms, and the alkyl group may be linear or branched. Any hydrogen atom in the alkyl group may be replaced by a fluorine atom, and one —CH2— group or two or more nonadjacent —CH2— group in the alkyl group may be each independently replaced by —O—, —S—, —CO—, —COO—, —OCO—, —CO—S—, —S—CO—, —O—CO—O—, —CO—NH—, —NH—CO—, —CH═CH—COO—, —CH═CH—OCO—, —COO—CH═CH—, —OCO—CH═CH—, —CH═CH—, —CF═CF—, or —C≡C—. The meaning of W82 may be the same as the meaning of W81, and W81 and W82 may together form a ring structure. Alternatively, W82 represents the following group:
(wherein the meaning of PW82 is the same as the meaning of P11; the meaning of SW82 is the same as the meaning of S11; the meaning of XW82 is the same as the meaning of X11; and the meaning of nW82 is the same as the meaning of m11).
The aromatic group included in W81 may be an aromatic hydrocarbon group or a heteroaromatic group, and W81 may include both of them. These aromatic groups may be bonded through a single bond or a linking group (—OCO—, —COO—, —CO—, or —O—) or may form a condensed ring. W81 may include, in addition to the aromatic group, an acyclic structure and/or a cyclic structure other than the aromatic group. In terms of availability of raw materials and ease of synthesis, the aromatic group included in W81 is one of formula (W-1) to formula (W-19) below that may be unsubstituted or substituted by at least one L1:
(In the above formulas, these groups may have a bond at any position, and any two or more aromatic groups selected from these groups may form a group connected through a single bond. Q: represents —O—, —S—, or —NR4— (wherein R4 represents a hydrogen atom or an alkyl group having 1 to 8 carbon atoms), or —CO—. In these aromatic groups, —CH═ groups may be each independently replaced by —N═, and —CH2— groups may be each independently replaced by —O—, —S—, —NR4— (wherein R4 represents a hydrogen atom or an alkyl group having 1 to 8 carbon atoms) or —CO—. However, these groups include no —O—O— bond. The group represented by formula (W-1) is preferably a group selected from formula (W-1-1) to formula (W-1-8) below that may be unsubstituted or substituted by at least one L1:
(wherein these groups may have a bond at any position). The group represented by formula (W-7) is preferably a group selected from formula (W-7-1) to formula (W-7-7) below that may be unsubstituted or substituted by at least one L1:
(wherein these groups may have a bond at any position). The group represented by formula (W-10) is preferably a group selected from formula (W-10-1) to formula (W-10-8) below that may be unsubstituted or substituted by at least one L1:
(wherein these groups may have a bond at any position, and R6 represents a hydrogen atom or an alkyl group having 1 to 8 carbon atoms). The group represented by formula (W-11) is preferably a group selected from formula (W-11-1) to formula (W-11-13) below that may be unsubstituted or substituted by at least one L1:
(wherein these groups may have a bond at any position, and R6 represents a hydrogen atom or an alkyl group having 1 to 8 carbon atoms). The group represented by formula (W-12) is preferably a group selected from formula (W-12-1) to formula (W-12-19) below that may be unsubstituted or substituted by at least one L1:
(wherein these groups may have a bond at any position; R6 represents a hydrogen atom or an alkyl group having 1 to 8 carbon atoms; and, when a plurality of R6s are present, they may be the same or different). The group represented by formula (W-13) is preferably a group selected from formula (W-13-1) to formula (W-13-10) below that may be unsubstituted or substituted by at least one L1:
(wherein these groups may have a bond at any position; R6 represents a hydrogen atom or an alkyl group having 1 to 8 carbon atoms; and, when a plurality of R6s are present, they may be the same or different). The group represented by formula (W-14) is preferably a group selected from formula (W-14-1) to formula (W-14-4) below that may be unsubstituted or substituted by at least one L1:
(wherein these groups may have a bond at any position, and R6 represents a hydrogen atom or an alkyl group having 1 to 8 carbon atoms). The group represented by formula (W-15) is preferably a group selected from formula (W-15-1) to formula (W-15-18) below that may be unsubstituted or substituted by at least one L1:
(wherein these groups may have a bond at any position, and R6 represents a hydrogen atom or an alkyl group having 1 to 8 carbon atoms). The group represented by formula (W-16) is preferably a group selected from formula (W-16-1) to formula (W-16-4) below that may be unsubstituted or substituted by at least one L1:
(wherein these groups may have a bond at any position, and R6 represents a hydrogen atom or an alkyl group having 1 to 8 carbon atoms). The group represented by formula (W-17) is preferably a group selected from formula (W-17-1) to formula (W-17-6) below that may be unsubstituted or substituted by at least one L1:
(wherein these groups may have a bond at any position, and R6 represents a hydrogen atom or an alkyl group having 1 to 8 carbon atoms). The group represented by formula (W-18) is preferably a group selected from formula (W-18-1) to formula (W-18-6) below that may be unsubstituted or substituted by at least one L1:
(wherein these groups may have a bond at any position; R6 represents a hydrogen atom or an alkyl group having 1 to 8 carbon atoms; and, when a plurality of R6s are present, they may be the same or different). The group represented by formula (W-19) is preferably a group selected from formula (W-19-1) to formula (W-19-9) below that may be unsubstituted or substituted by at least one L1:
(wherein these groups may have a bond at any position; R6 represents a hydrogen atom or an alkyl group having 1 to 8 carbon atoms; and, when a plurality of R6s are present, they may be the same or different). The aromatic group included in W81 is more preferably a group selected from formula (W-1-1), formula (W-7-1), formula (W-7-2), formula (W-7-7), formula (W-8), formula (W-10-6), formula (W-10-7), formula (W-10-8), formula (W-11-8), formula (W-11-9), formula (W-11-10), formula (W-11-11), formula (W-11-12), and formula (W-11-13) that may be unsubstituted or substituted by at least one L1 and is particularly preferably a group selected from formula (W-1-1), formula (W-7-1), formula (W-7-2), formula (W-7-7), formula (W-10-6), formula (W-10-7), and formula (W-10-8) that may be unsubstituted or substituted by at least one L1. Particularly preferably, W81 is a group selected from formula (W-a-1) to formula (W-a-6) below:
(wherein r represents an integer from 0 to 5; s represents an integer from 0 to 4; and t represents an integer from 0 to 3).
W82 represents a hydrogen atom or a linear or branched alkyl group which has 1 to 20 carbon atoms and in which one —CH2— group or two or more nonadjacent —CH2— groups may be each independently replaced by —O—, —S—, —CO—, —COO—, —OCO—, —CO—S—, —S—CO—, —O—CO—O—, —CO—NH—, —NH—CO—, —CH═CH—COO—, —CH═CH—OCO—, —COO—CH═CH—, —OCO—CH═CH—, —CH═CH—, —CF═CF—, or —C≡C—, and any hydrogen atom in the alkyl group may be replaced by a fluorine atom. The meaning of W82 may be the same as the meaning of W81, and W81 and W82 may together form a ring structure. Alternatively, W82 represents the following group:
(wherein the meaning of PW82 is the same as the meaning of P11; the meaning of SW82 is the same as the meaning of S11; the meaning of XW82 is the same as the meaning of X11; and the meaning of nW82 is the same as the meaning of m11).
In terms of availability of raw materials and ease of synthesis, W82 preferably represents a hydrogen atom or a linear or branched alkyl group which has 1 to 20 carbon atoms, in which any hydrogen atom in the alkyl group may be replaced by a fluorine atom, and in which one —CH2— group or two or more nonadjacent —CH2— groups in the alkyl group may be each independently replaced by —O—, —CO—, —COO—, —OCO—, —CH═CH—COO—, —OCO—CH═CH—, —CH═CH—, —CF═CF—, or —C≡C—, more preferably represents a hydrogen atom or a linear or branched alkyl group having 1 to 20 carbon atoms, and particularly preferably represents a hydrogen atom or a linear alkyl group having 1 to 12 carbon atoms. When the meaning of W82 is the same as the meaning of W81, W82 and W81 may be the same or different, and preferred groups for W82 are the same as those described for W81. When W81 and W82 together form a ring structure, a ring group represented by —NW81W82 is preferably a group selected from formula (W-b-1) to formula (W-b-42) below that may be unsubstituted or substituted by at least one L1:
(wherein R6 represents a hydrogen atom or an alkyl group having 1 to 8 carbon atoms). In terms of availability of raw materials and ease of synthesis, the ring group represented by —NW81W82 is particularly preferably a group selected from formula (W-b-20), formula (W-b-21), formula (W-b-22), formula (W-b-23), formula (W-b-24), formula (W-b-25), and formula (W-b-33) that may be unsubstituted or substituted by at least one L1.
A ring group represented by ═CW81W82 is preferably a group selected from formula (W-c-1) to formula (W-c-81) below that may be unsubstituted or substituted by at least one L1:
(wherein R6 represents a hydrogen atom or an alkyl group having 1 to 8 carbon atoms, and, when a plurality of R6s are present, they may be the same or different). In terms of availability of raw materials and ease of synthesis, the ring group represented by ═CW81W82 is particularly preferably a group selected from formula (W-c-11), formula (W-c-12), formula (W-c-13), formula (W-c-14), formula (W-c-53), formula (W-c-54), formula (W-c-55), formula (W-c-56), formula (W-c-57), and formula (W-c-78) that may be unsubstituted or substituted by at least one L.
When W82 represents the following group:
preferred groups for PW82 are the same as those described for P11, and preferred groups for SW82 are the same as those described for S11. Preferred groups for XW82 are the same as those described for X11, and preferred nW82 is the same as that described for m11.
The total number of π electrons contained in W81 and W82 is preferably 4 to 24, in terms of wavelength dispersion properties, storage stability, liquid crystallinity, and ease of synthesis. W83 and W84 each independently represent a halogen atom, a cyano group, a hydroxy group, a nitro group, a carboxyl group, a carbamoyloxy group, an amino group, a sulfamoyl group, a group having at least one aromatic group and having 5 to 30 carbon atoms, an alkyl group having 1 to 20 carbon atoms, a cycloalkyl group having 3 to 20 carbon atoms, an alkenyl group having 2 to 20 carbon atoms, a cycloalkenyl group having 3 to 20 carbon atoms, an alkoxy group having 1 to 20 carbon atoms, an acyloxy group having 2 to 20 carbon atoms, or an alkylcarbonyloxy group having 2 to 20 carbon atoms. In the alkyl group, the cycloalkyl group, the alkenyl group, the cycloalkenyl group, the alkoxy group, the acyloxy group, and the alkylcarbonyloxy group, one —CH2— group or two or more nonadjacent —CH2— groups may be each independently replaced by —O—, —S—, —CO—, —COO—, —OCO—, —CO—S—, —S—CO—, —O—CO—O—, —CO—NH—, —NH—CO—, or —C≡C—. W83 is more preferably a group selected from a cyano group, a nitro group, a carboxyl group, and alkyl, alkenyl, acyloxy, and alkylcarbonyloxy groups which have 1 to 20 carbon atoms and in which one —CH2— group or two or more nonadjacent —CH2— groups may be each independently replaced by —O—, —S—, —CO—, —COO—, —OCO—, —CO—S—, —S—CO—, —O—CO—O—, —CO—NH—, —NH—CO—, or —C≡C—. W83 is particularly preferably a group selected from a cyano group, a carboxyl group, and alkyl, alkenyl, acyloxy, and alkylcarbonyloxy groups which have 1 to 20 carbon atoms and in which one —CH2— group or two or more nonadjacent —CH2— groups may be each independently replaced by —CO—, —COO—, —OCO—, —O—CO—O—, —CO—NH—, —NH—CO—, or —C≡C—. W84 is more preferably a group selected from a cyano group, a nitro group, a carboxyl group, and alkyl, alkenyl, acyloxy, and alkylcarbonyloxy groups which have 1 to 20 carbon atoms and in which one —CH2— group or two or more nonadjacent —CH2— groups may be each independently replaced by —O—, —S—, —CO—, —COO—, —OCO—, —CO—S—, —S—CO—, —O—CO—O—, —CO—NH—, —NH—CO—, or —C≡C—. W84 is particularly preferably a group selected from a cyano group, a carboxyl group, and alkyl, alkenyl, acyloxy, and alkylcarbonyloxy groups which have 1 to 20 carbon atoms and in which one —CH2— group or two or more nonadjacent —CH2— groups may be each independently replaced by —CO—, —COO—, —OCO—, —O—CO—O—, —CO—NH—, —NH—CO—, or —C≡C—.
L1 represents a fluorine atom, a chlorine atom, a bromine atom, an iodine atom, a pentafluorosulfuranyl group, a nitro group, an isocyano group, an amino group, a hydroxyl group, a mercapto group, a methylamino group, a dimethylamino group, a diethylamino group, a diisopropylamino group, a trimethylsilyl group, a dimethylsilyl group, a thioisocyano group, or a linear or branched alkyl group which has 1 to 20 carbon atoms and in which one —CH2— group or two or more nonadjacent —CH2— groups may be each independently replaced by —O—, —S—, —CO—, —COO—, —OCO—, —CO—S—, —S—CO—, —O—CO—O—, —CO—NH—, —NH—CO—, —CH═CH—COO—, —CH═CH—OCO—, —COO—CH═CH—, —OCO—CH═CH—, —CH═CH—, —CF═CF—, or —C≡C—, and any hydrogen atom in the alkyl group may be replaced by a fluorine atom. In terms of liquid crystallinity and ease of synthesis, L1 preferably represents a fluorine atom, a chlorine atom, a pentafluorosulfuranyl group, a nitro group, a methylamino group, a dimethylamino group, a diethylamino group, a diisopropylamino group, or a linear or branched alkyl group which has 1 to 20 carbon atoms, in which any hydrogen atom may be replaced by a fluorine atom, and in which one —CH2— group or two or more nonadjacent —CH2— groups may be each independently replaced by a group selected from —O—, —S—, —CO—, —COO—, —OCO—, —O—CO—O—, —CH═CH—, —CF═CF—, and —C≡C—. L1 more preferably represents a fluorine atom, a chlorine atom, or a linear or branched alkyl group which has 1 to 12 carbon atoms, in which any hydrogen atom may be replaced by a fluorine atom, and in which one —CH2— group or two or more nonadjacent —CH2— groups may be each independently replaced by a group selected from —O—, —COO—, and —OCO—. L1 still more preferably represents a fluorine atom, a chlorine atom, or a linear or branched alkyl or alkoxy group which has 1 to 12 carbon atoms and in which any hydrogen atom may be replaced by a fluorine atom. L1 particularly preferably represents a fluorine atom, a chlorine atom, or a linear alkyl or alkoxy group having 1 to 8 carbon atoms.
In general formula (1), m11 represents an integer of 0 to 8. In terms of liquid crystallinity, availability of raw materials, and ease of synthesis, m11 represents preferably an integer from 0 to 4, more preferably an integer from 0 to 2, still more preferably 0 or 1, and particularly preferably 1.
In general formula (2) to general formula (7), m2 to m7 each represent an integer from 0 to 5. In terms of liquid crystallinity, availability of raw materials, and ease of synthesis, m2 to m7 each represent preferably an integer from 0 to 4, more preferably an integer from 0 to 2, still more preferably 0 or 1, and particularly preferably 1.
In general formula (a), j11 and j12 each independently represent an integer from 1 to 5 while j11+j12 represents an integer from 2 to 5. In terms of liquid crystallinity, ease of synthesis, and storage stability, j11 and j12 each independently represent preferably an integer from 1 to 4, more preferably an integer from 1 to 3, and particularly preferably 1 or 2. Preferably, j11+j12 represents an integer from 2 to 4.
Specifically, the compound represented by general formula (1) is preferably compounds represented by the following formula (1-a-1) to formula (1-a-105):
(in the above formulas, each m11 independently represents an integer of 1 to 10, and m and n each represent an integer of 0 to 10). These liquid crystalline compounds may be used alone or as a mixture of two or more.
Specifically, the compound represented by general formula (2) is preferably compounds represented by the following formula (2-a-1) to formula (2-a-61):
(in the above formulas, each n independently represents an integer of 1 to 10). These liquid crystalline compounds may be used alone or as a mixture of two or more.
Specifically, the compound represented by general formula (3) is preferably compounds represented by the following formula (3-a-1) to formula (3-a-17):
These liquid crystalline compounds may be used alone or as a mixture of two or more.
In general formula (4), the group represented by P43 (S43—X43)14— is bonded to A11 or A12 in general formula (a).
Specifically, the compound represented by general formula (4) is preferably compounds represented by the following formula (4-a-1) to formula (4-a-26):
(in the above formulas, m and n each independently represent an integer of 1 to 10). These liquid crystalline compounds may be used alone or as a mixture of two or more.
Specifically, the compound represented by general formula (5) is preferably compounds represented by the following formula (5-a-1) to formula (5-a-29):
(in these formulas, each n independently represents an integer of 1 to 10). These liquid crystalline compounds may be used alone or as a mixture of two or more.
In general formula (6), the group represented by P63—(S63—X63)16— and the group represented by P64—(S64—X64)k6— are bonded to A11 or A12 in general formula (a).
Specifically, the compound represented by general formula (6) is preferably compounds represented by the following formula (6-a-1) to formula (6-a-25):
(in the above formulas, k, l, m, and n each independently represent an integer of 1 to 10). These liquid crystalline compounds may be used alone or as a mixture of two or more.
Specifically, the compound represented by general formula (7) is preferably compounds represented by the following formula (7-a-1) to formula (7-a-26):
These liquid crystalline compounds may be used alone or as a mixture of two or more.
The total content of polymerizable compounds having one or two or more polymerizable groups is preferably 60 to 100% by mass, more preferably 65 to 98% by mass, and particularly preferably 70 to 95% by mass with respect to the total mass of polymerizable compounds used for the polymerizable composition.
The polymerizable composition of the present invention contains an organic solvent having a solubility parameter (SP value) of 8.50 to 11.00 (cal/cm3)0.5, a boiling point of 75 to 180° C., and an evaporation rate index of 20 to 700.
The polymerizable composition of the present invention uses the above-described organic solvent. Therefore, when an optically anisotropic body is formed using the polymerizable composition, the organic solvent causes less attack on the substrate used, so that uneven application can be improved while good alignment is maintained.
The solubility parameter (SP value) of the organic solvent is 8.50 to 11.00 (cal/cm3)0.5 and is preferably 8.50 to 10.80 and more preferably 8.50 to 10.60. The boiling point of the organic solvent is 75 to 180° C. and is preferably 75 to 170° C. and more preferably 75 to 160° C. The evaporation rate index of the organic solvent is 20 to 700 and is preferably 20 to 650 and more preferably 20 to 600. When the polymerizable composition contains the above organic solvent, both the solubility of the polymerizable compounds and the controllability of the volatilization rate of the organic solvent can be achieved simultaneously in the polymerizable composition, and a coating film with less unevenness can be formed. The SP value (solubility parameter/unit: ((cal/cm3)0.5) in the present invention is computed by the Fedors method. The evaporation rate index is an index representing the evaporation rate of the solvent with the evaporation rate of butyl acetate set to 100 and is based on the description in Section “13.2 Evaporativity of solvents” on page 294 and Appendix B “Properties of solvents” in “Paint Flow and Pigment Dispersion” (Translation supervised by Kenji Ueki, KYORITSU SHUPPAN CO., LTD., published on May 1, Showa 46).
Examples of the organic solvent include ketone-based organic solvents, acetate-based organic solvents, aromatic hydrocarbon-based organic solvents, and glycol ether-based organic solvents.
Examples of the ketone-based organic solvents include diisobutyl ketone, methyl isobutyl ketone, methyl propyl ketone, methyl ethyl ketone, cyclohexanone, and cyclopentanone.
Examples of the acetate-based organic solvents include isopropyl acetate, isobutyl acetate, butyl acetate, ethyl acetate, and γ-butyrolactone.
Examples of the aromatic hydrocarbon-based organic solvents include toluene and xylene.
Examples of the glycol ether-based organic solvents include propylene glycol monomethyl ether.
Of these, the ketone-based organic solvents, the acetate-based organic solvents, and the aromatic hydrocarbon-based organic solvents are preferred.
In particular, in terms of attack on the substrate and the volatilization rate of the solvent, methyl ethyl ketone, methyl isobutyl ketone, cyclohexanone, cyclopentanone, ethyl acetate, and toluene are particularly preferably used.
The polymerizable composition used in the present invention is generally used for coating. No particular limitation is imposed on the ratio of the organic solvent used so long as the coated state is not significantly impaired. The ratio of the total mass of polymerizable compounds in the polymerizable composition is preferably 0.1 to 99% by mass, more preferably 5 to 60% by mass, and particularly preferably 10 to 50% by mass.
Preferably, the organic solvent includes at least one selected from group (I) including organic solvents having boiling points of 75 to 105° C. and at least one selected from group (II) including organic solvents having boiling points of 106 to 180° C. In this case, the organic solvents in group (I) have boiling points of preferably 75 to 100° C. and more preferably 75 to 95° C., and the organic solvents in group (II) have boiling points of preferably 108 to 170° C. and more preferably 110 to 160° C. The ratio of group (I) to group (II), i.e., (I)/(II), is preferably 8/2 to 2/8, more preferably 7/3 to 3/7, and particularly preferably 6/4 to 4/6.
When the polymerizable compounds are dissolved in the organic solvent, it is preferable to dissolve the compounds under heating and stirring in order to dissolve them uniformly. The heating temperature during the heating and stirring may be appropriately controlled in consideration of the solubility of the polymerizable compounds used in the organic solvent. In terms of productivity, the heating temperature is preferably 15° C. to 130° C., more preferably 30° C. to 110° C., and particularly preferably 50° C. to 100° C.
The polymerizable liquid crystal composition used in the present invention may optionally contain an initiator. he polymerization initiator used for the polymerizable composition of the present invention is used for polymerization of the polymerizable composition of the present invention. No particular limitation is imposed on the photopolymerization initiator used when the polymerizable composition is polymerized by irradiation with light. A commonly used photopolymerization initiator may be used so long as the aligned state of the polymerizable compound is not inhibited.
Examples of the photopolymerization initiator include: 1-hydroxycyclohexyl phenyl ketone “IRGACURE 184,” 1-(4-isopropylphenyl)-2-hydroxy-2-methylpropan-1-one “DAROCUR 1116,” 2-methyl-1-[(methylthio)phenyl]-2-morpholinopropan-1 “IRGACURE 907,” 2,2-dimethoxy-1,2-diphenylethan-1-one “IRGACURE 651,” 2-benzyl-2-dimethylamino-1-(4-morpholinophenyl)-butanone “IRGACURE 369”), 2-dimethylamino-2-(4-methylbenzyl)-1-(4-morpholino-phenyl)butan-1-one “IRGACURE 379,” 2,2-dimethoxy-1,2-diphenylethan-1-one, bis(2,4,6-trimethylbenzoyl)-diphenylphosphine oxide “LUCIRIN TPO,” 2,4,6-trimethylbenzoyl-phenyl-phosphine oxide “IRGACURE 819,” 1,2-octanedione, 1-[4-(phenylthio)-,2-(O-benzoyloxime)], ethanone “IRGACURE OXE 01”), and 1-[9-ethyl-6-(2-methylbenzoyl)-9H-carbazole-3-yl]-,1-(O-acetyloxime) “IRGACURE OXE 02” (these are manufactured by BASF.; a mixture of 2,4-diethylthioxanthone (“KAYACURE DETX” manufactured by Nippon Kayaku Co., Ltd.) and p-dimethylaminobenzoic acid ethyl ester (“KAYACURE EPA” manufactured by Nippon Kayaku Co., Ltd.); a mixture of isopropylthioxanthone (“QUANTACURE-ITX” manufactured by Ward Blenkinsop) and p-dimethylaminobenzoic acid ethyl ester; “Esacure ONE,” “Esacure KIP150,” “Esacure KIP160,” “Esacure 1001M,” “Esacure A198,” “Esacure KIP IT,” “Esacure KTO46,” and “Esacure TZT” (manufactured by Lamberti); and “Speedcure BMS,” “Speedcure PBZ,” and “Benzophenone” from LAMBSON. A photo-acid generator may be used as a photo-cationic initiator. Examples of the photo-acid generator include diazodisulfone-based compounds, triphenylsulfonium-based compounds, phenylsulfone-based compounds, sulfonylpyridine-based compounds, triazine-based compounds, and diphenyliodonium compounds.
The content of the photopolymerization initiator is preferably 0.1 to 10% by mass and particularly preferably 1 to 6% by mass with respect to the total mass of the polymerizable compounds contained in the polymerizable composition. One photopolymerization initiator may be used, or a mixture of two or more may be used.
A commonly used thermal polymerization initiator may be used for thermal polymerization. Examples of the thermal polymerization initiator that can be used include: organic peroxides such as methyl acetoacetate peroxide, cumene hydroperoxide, benzoyl peroxide, bis(4-t-butylcyclohexyl)peroxydicarbonate, t-butylperoxybenzoate, methyl ethyl ketone peroxide, 1,1-bis(t-hexylperoxy)3,3,5-trimethylcyclohexane, p-pentahydroperoxide, t-butyl hydroperoxide, dicumyl peroxide, isobutyl peroxide, di(3-methyl-3-methoxybutyl)peroxydicarbonate, and 1,1-bis(t-butylperoxy)cyclohexane; azonitrile compounds such as 2,2′-azobisisobutyronitrile and 2,2′-azobis(2,4-dimethylvaleronitrile); azoamidine compounds such as 2,2′-azobis(2-methyl-N-phenylpropione-amidine)dihydrochloride; azoamide compounds such as 2,2′azobis(2-methyl-N-[1,1-bis(hydroxymethyl)-2-hydroxyethyl]propionamide); and alkylazo compounds such as 2,2′azobis(2,4,4-trimethylpentane). The content of the thermal polymerization initiator is preferably 0.1 to 10 mass and particularly preferably 1 to 6% by mass. These may be used alone or as a mixture of two or more.
In the polymerizable composition used in the present invention, general-purpose additives may be used according to the intended purpose. For example, additives such as a polymerization inhibitor, an antioxidant, an ultraviolet absorber, a leveling agent, an alignment controlling agent, a chain transfer agent, an infrared absorber, a thixotropic agent, an antistatic agent, a pigment, a filler, a chiral compound, a non-liquid crystalline compound having a polymerizable group, other liquid crystal compounds, and an alignment material may be added so long as the alignment of the liquid crystal is not significantly impaired.
The polymerizable composition used in the present invention may optionally contain a polymerization inhibitor. No particular limitation is imposed on the polymerization inhibitor used, and a commonly used polymerization inhibitor may be used.
Examples of the polymerization inhibitor include: phenol-based compounds such as p-methoxyphenol, cresol, t-butylcatechol, 3.5-di-t-butyl-4-hydroxytoluene, 2.2′-methylene bis(4-methyl-6-t-butylphenol), 2.2′-methylene bis(4-ethyl-6-t-butylphenol), 4.4′-thio bis(3-methyl-6-t-butylphenol), 4-methoxy-1-naphthol, and 4,4′-dialkoxy-2,2′-bi-1-naphthol; quinone-based compounds such as hydroquinone, methylhydroquinone, tert-butylhydroquinone, p-benzoquinone, methyl-p-benzoquinone, tert-butyl-p-benzoquinone, 2,5-diphenylbenzoquinone, 2-hydroxy-1,4-naphthoquinone, 1,4-naphthoquinone, 2,3-dichloro-1,4-naphthoquinone, anthraquinone, and diphenoquinone; amine-based compounds such as p-phenylenediamine, 4-aminodiphenylamine, N.N′-diphenyl-p-phenylenediamine, N-1-propyl-N′-phenyl-p-phenylenediamine, N-(1.3-dimethylbutyl)-N′-phenyl-p-phenylenediamine, N.N′-di-2-naphthyl-p-phenylenediamine, diphenylamine, N-phenyl-β-naphthylamine, 4.4′-dicumyl-diphenylamine, and 4.4′-dioctyl-diphenylamine; thioether-based compounds such as phenothiazine and distearyl thiodipropionate; and nitroso-based compounds such as N-nitrosodiphenylamine, N-nitrosophenylnaphthylamine, N-nitrosodinaphthylamine, p-nitrosophenol, nitrosobenzene, p-nitrosodiphenylamine, α-nitroso-β-naphthol, etc., N,N-dimethyl-p-nitrosoaniline, p-nitrosodiphenylamine, p-nitrosodimethylamine, p-nitroso-N,N-diethylamine, N-nitrosoethanolamine, N-nitrosodi-n-butylamine, N-nitroso-N-n-butyl-4-butanolamine, N-nitroso-diisopropanolamine, N-nitroso-N-ethyl-4-butanolamine, 5-nitroso-8-hydroxyquinoline, N-nitrosomorpholine, N-nitroso-N-phenylhydroxylamine ammonium salt, nitrosobenzene, 2,4.6-tri-tert-butylnitrosobenzene, N-nitroso-N-methyl-p-toluenesulfonamide, N-nitroso-N-ethylurethane, N-nitroso-N-n-propylurethane, 1-nitroso-2-naphthol, 2-nitroso-1-naphthol, sodium 1-nitroso-2-naphthol-3,6-sulfonate, sodium 2-nitroso-1-naphthol-4-sulfonate, 2-nitroso-5-methylaminophenol hydrochloride, and 2-nitroso-5-methylaminophenol hydrochloride.
The amount of the polymerization inhibitor added is preferably 0.01 to 1.0% by mass and more preferably 0.05 to 0.5% by mass with respect to the total mass of the polymerizable compounds contained in the polymerizable composition.
The polymerizable composition used in the present invention may optionally contain an antioxidant etc. Examples of such compounds include hydroquinone derivatives, nitrosoamine-based polymerization inhibitors, and hindered phenol-based antioxidants. More specific examples of such compounds include: tert-butylhydroquinone; “Q-1300” and “Q-1301” available from Wako Pure Chemical Industries, Ltd.; pentaerythritol tetrakis[3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate “IRGANOX 1010,” thiodiethylene bis[3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate “IRGANOX 1035,” octadecyl-3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate “IRGANOX 1076,” “IRGANOX 1135,” “IRGANOX 1330,” 4,6-bis(octylthiomethyl)-o-cresol “IRGANOX 1520L,” “IRGANOX 1726,” “IRGANOX 245,” “IRGANOX 259,” “IRGANOX 3114,” “IRGANOX 3790,” “IRGANOX 5057,” and “IRGANOX 565” (these are manufactured by BASF); ADEKA STAB AO-20, AO-30, AO-40, AO-50, AO-60, and AO-80 manufactured by ADEKA CORPORATION; and SUMILIZER BHT, SUMILIZER BBM-S, and SUMILIZER GA-80 available from Sumitomo Chemical Co., Ltd.
The amount of the antioxidant added is preferably 0.01 to 2.0% by mass and more preferably 0.05 to 1.0% by mass with respect to the total mass of the polymerizable compounds contained in the polymerizable composition.
The polymerizable composition used in the present invention may optionally contain an ultraviolet absorber and a light stabilizer. No particular limitation is imposed on the ultraviolet absorber used and the light stabilizer used. It is preferable to use an ultraviolet absorber and a light stabilizer that can improve the light fastness of optically anisotropic bodies, optical films, etc.
Examples of the ultraviolet absorber include: 2-(2-hydroxy-5-t-butylphenyl)-2H-benzotriazole “TINUVIN PS,” “TINUVIN 99-2,” “TINUVIN 109,” “TINUVIN 213,” “TINUVIN 234,” “TINUVIN 326,” “TINUVIN 328,” “TINUVIN 329,” “TINUVIN 384-2,” “TINUVIN 571,” 2-(2H-benzotriazol-2-yl)-4,6-bis(1-methyl-1-phenylethyl)phenol “TINUVIN 900,” 2-(2H-benzotriazol-2-yl)-6-(1-methyl-1-phenylethyl)-4-(1,1,3,3-tetramethylbutyl)phenol “TINUVIN 928,” “TINUVIN 1130,” “TINUVIN 400,” “TINUVIN 405,” 2,4-bis[2-hydroxy-4-butoxyphenyl]-6-(2,4-dibutoxyphenyl)-1,3,5-triazine “TINUVIN 460,” “TINUVIN 479,” and “TINUVIN 5236” (these are manufactured by BASF); and “ADEKA STAB LA-32,” “ADEKA STAB LA-34,” “ADEKA STAB LA-36,” “ADEKA STAB LA-31,” “ADEKA STAB 1413,” and “ADEKA STAB LA-51” (these are manufactured by ADEKA CORPORATION).
Examples of the light stabilizer include: “TINUVIN 111FDL,” “TINUVIN 123,” “TINUVIN 144,” “TINUVIN 152,” “TINUVIN 292,” “TINUVIN 622,” “TINUVIN 770,” “TINUVIN 765,” “TINUVIN 780,” “TINUVIN 905,” “TINUVIN 5100,” “TINUVIN 5050,” “TINUVIN 5060,” “TINUVIN 5151,” “CHIMASSORB 119FL,” “CHIMASSORB 944FL,” and “CHIMASSORB 944LD” (these are manufactured by BASF); and “ADEKA STAB LA-52,” “ADEKA STAB LA-57,” “ADEKA STAB LA-62,” “ADEKA STAB LA-67,” “ADEKA STAB LA-63P,” “ADEKA STAB LA-68LD,” “ADEKA STAB LA-77,” “ADEKA STAB LA-82,” and “ADEKA STAB LA-87” (these are manufactured by ADEKA CORPORATION).
The polymerizable composition of the present invention may optionally contain a leveling agent. No particular limitation is imposed on the leveling agent used. Preferably, the leveling agent used can reduce unevenness in the thickness of a thin film to be formed such as an optically anisotropic body or an optical film. Examples of the leveling agent include alkyl carboxylates, alkyl phosphates, alkyl sulfonates, fluoroalkyl carboxylates, fluoroalkyl phosphates, fluoroalkyl sulfonates, polyoxyethylene derivatives, fluoroalkyl ethylene oxide derivatives, polyethylene glycol derivatives, alkyl ammonium salts, and fluoroalkyl ammonium salts.
Specific examples of the leveling agent include: “MEGAFACE F-114,” “MEGAFACE F-251,” “MEGAFACE F-281,” “MEGAFACE F-410,” “MEGAFACE F-430,” “MEGAFACE F-444,” “MEGAFACE F-472SF,” “MEGAFACE F-477,” “MEGAFACE F-510,” “MEGAFACE F-511,” “MEGAFACE F-552,” “MEGAFACE F-553,” “MEGAFACE F-554,” “MEGAFACE F-555,” “MEGAFACE F-556,” “MEGAFACE F-557,” “MEGAFACE F-558,” “MEGAFACE F-559,” “MEGAFACE F-560,” “MEGAFACE F-561,” “MEGAFACE F-562,” “MEGAFACE F-563,” “MEGAFACE F-565,” “MEGAFACE F-567,” “MEGAFACE F-568,” “MEGAFACE F-569,” “MEGAFACE F-570,” “MEGAFACE F-571,” “MEGAFACE R-40,” “MEGAFACE R-41,” “MEGAFACE R-43,” “MEGAFACE R-94,” “MEGAFACE RS-72-K,” “MEGAFACE RS-75,” “MEGAFACE RS-76-E,” “MEGAFACE RS-76-NS,” “MEGAFACE RS-90,” “MEGAFACE EXP.TF-1367,” “MEGAFACE EXP.TF1437,” “MEGAFACE EXP.TF1537,” and “MEGAFACE EXP.TF-2066” (manufactured by DIC Corporation); “FTERGENT 100,” “FTERGENT 100C,” “FTERGENT 110,” “FTERGENT 150,” “FTERGENT 150CH,” “FTERGENT 100A-K,” “FTERGENT 300,” “FTERGENT 310,” “FTERGENT 320,” “FTERGENT 400SW,” “FTERGENT 251,” “FTERGENT 215M,” “FTERGENT 212M,” “FTERGENT 215M,” “FTERGENT 250,” “FTERGENT 222F,” “FTERGENT 212D,” “FTX-218,” “FTERGENT 209F,” “FTERGENT 245F,” “FTERGENT 208G,” “FTERGENT 240G,” “FTERGENT 212P,” “FTERGENT 220P,” “FTERGENT 228P,” “DFX-18,” “FTERGENT 601AD,” “FTERGENT 602A,” “FTERGENT 650A,” “FTERGENT 750FM,” “FTX-730FM,” “FTERGENT 730FL,” “FTERGENT 710FS,” “FTERGENT 710FM,” “FTERGENT 710FL,” “FTERGENT 750LL,” “FTX-730LS,” and “FTERGENT 730LM” (manufactured by NEOS Company Limited); “BYK-300,” “BYK-302,” “BYK-306,” “BYK-307,” “BYK-310,” “BYK-315,” “BYK-320,” “BYK-322,” “BYK-323,” “BYK-325,” “BYK-330,” “BYK-331,” “BYK-333,” “BYK-337,” “BYK-340,” “BYK-344,” “BYK-370,” “BYK-375,” “BYK-377,” “BYK-350,” “BYK-352,” “BYK-354,” “BYK-355,” “BYK-356,” “BYK-358N,” “BYK-361N,” “BYK-357,” “BYK-390,” “BYK-392,” “BYK-UV3500,” “BYK-UV3510,” “BYK-UV3570,” and “BYK-Silclean 3700” (manufactured by BYK Japan KK); “TEGO Rad 2100,” “TEGO Rad 2011,” “TEGO Rad 2200N,” “TEGO Rad 2250,” “TEGO Rad 2300,” “TEGO Rad 2500,” “TEGO Rad 2600,” “TEGO Rad 2650,” “TEGO Rad 2700,” “TEGO Flow 300,” “TEGO Flow 370,” “TEGO Flow 425,” “TEGO Flow ATF2,” “TEGO Flow ZFS460,” “TEGO Glide 100,” “TEGO Glide 110,” “TEGO Glide 130,” “TEGO Glide 410,” “TEGO Glide 411,” “TEGO Glide 415,” “TEGO Glide 432,” “TEGO Glide 440,” “TEGO Glide 450,” “TEGO Glide 482,” “TEGO Glide A115,” “TEGO Glide B1484,” “TEGO Glide ZG400,” “TEGO Twin 4000,” “TEGO Twin 4100,” “TEGO Twin 4200,” “TEGO Wet 240,” “TEGO Wet 250,” “TEGO Wet 260,” “TEGO Wet 265,” “TEGO Wet 270,” “TEGO Wet 280,” “TEGO Wet 500,” “TEGO Wet 505,” “TEGO Wet 510,” “TEGO Wet 520,” and “TEGO Wet KL245” (manufactured by Evonik Industries); “FC-4430” and “FC-4432” (manufactured by 3M Japan Limited); “UNIDYNE NS” (manufactured by DAIKIN INDUSTRIES, Ltd.); “SURFLON S-241,” “SURFLON S-242,” “SURFLON S-243,” “SURFLON S-420,” “SURFLON S-611,” “SURFLON S-651,” and “SURFLON S-386” (manufactured by AGC SEIMI CHEMICAL Co., Ltd.); “DISPARLON OX-880EF,” “DISPARLON OX-881,” “DISPARLON OX-883,” “DISPARLON OX-77EF,” “DISPARLON OX-710,” “DISPARLON 1922,” “DISPARLON 1927,” “DISPARLON 1958,” “DISPARLON P-410EF,” “DISPARLON P-420,” “DISPARLON P-425,” “DISPARLON PD-7,” “DISPARLON 1970,” “DISPARLON 230,” “DISPARLON LF-1980,” “DISPARLON LF-1982,” “DISPARLON LF-1983,” “DISPARLON LF-1084,” “DISPARLON LF-1985,” “DISPARLON LHP-90,” “DISPARLON LHP-91,” “DISPARLON LHP-95,” “DISPARLON LHP-96,” “DISPARLON OX-715,” “DISPARLON 1930N,” “DISPARLON 1931,” “DISPARLON 1933,” “DISPARLON 1934,” “DISPARLON 1711EF,” “DISPARLON 1751N,” “DISPARLON 1761,” “DISPARLON LS-009,” “DISPARLON LS-001,” and “DISPARLON LS-050” (manufactured by Kusumoto Chemicals, Ltd.); “PF-151N,” “PF-636,” “PF-6320,” “PF-656,” “PF-6520,” “PF-652-NF,” and “PF-3320” (manufactured by OMNOVA SOLUTIONS); “POLYFLOW No. 7,” “POLYFLOW No. 50E,” “POLYFLOW No. 50EHF,” “POLYFLOW No. 54N,” “POLYFLOW No. 75,” “POLYFLOW No. 77,” “POLYFLOW No. 85,” “POLYFLOW No. 85HF,” “POLYFLOW No. 90,” “POLYFLOW No. 90D-50,” “POLYFLOW No. 95,” “POLYFLOW No. 99C,” “POLYFLOW KL-400K,” “POLYFLOW KL-400HF,” “POLYFLOW KL-401,” “POLYFLOW KL-402,” “POLYFLOW KL-403,” “POLYFLOW KL-404,” “POLYFLOW KL-100,” “POLYFLOW LE-604,” “POLYFLOW KL-700,” “FLOWLEN AC-300,” “FLOWLEN AC-303,” “FLOWLEN AC-324,” “FLOWLEN AC-326F,” “FLOWLEN AC-530,” “FLOWLEN AC-903,” “FLOWLEN AC-903HF,” “FLOWLEN AC-1160,” “FLOWLEN AC-1190,” “FLOWLEN AC-2000,” “FLOWLEN AC-2300C,” “FLOWLEN AO-82,” “FLOWLEN AO-98,” and “FLOWLEN AO-108” (manufactured by KYOEISHA CHEMICAL Co., Ltd.); and “L-7001,” “L-7002,” “8032 ADDITIVE,” “57 ADDITIVE,” “L-7064,” “FZ-2110,” “FZ-2105,” “67 ADDITIVE,” and “8616 ADDITIVE” (manufactured by Toray Dow Silicone Co., Ltd.).
The amount of the leveling agent added is preferably 0.01 to 2% by mass and more preferably 0.05 to 0.5% by mass with respect to the total mass of the polymerizable compounds used in the polymerizable composition of the present invention.
When the polymerizable composition of the present invention that uses the leveling agent is formed into an optically anisotropic body, the tilt angle of the optically anisotropic body at its air interface may be effectively reduced.
The polymerizable composition used in the present invention may contain an alignment controlling agent in order to control the alignment state of the polymerizable compounds. Examples of the alignment controlling agent used include those that allow the liquid crystalline compound to align in a substantially horizontal manner, a substantially vertical manner, and a substantially hybrid manner with respect to a substrate. Examples of the alignment controlling agent used when a chiral compound is added include those that allow the liquid crystalline compound to align in a substantially planar manner. As described above, the surfactant may induce horizontal alignment or planar alignment. However, no particular limitation is imposed on the alignment controlling agent so long as the intended alignment state is induced, and a commonly used alignment controlling agent may be used.
Examples of such an alignment controlling agent include a compound having a repeating unit represented by general formula (8) below, having a weight average molecular weight of from 100 to 1,000,000 inclusive, and having the effect of effectively reducing the tilt angle of an optically anisotropic body to be formed at its air interface:
[Chem. 106]
CR11R12—CR13R14 (8)
(wherein R11, R12, R13, and R14 each independently represent a hydrogen atom, a halogen atom, or a hydrocarbon group having 1 to 20 carbon atoms, and at least one hydrogen atom in the hydrocarbon group may be replaced by a halogen atom).
Other examples of the alignment controlling agent include rod-shaped liquid crystalline compounds modified with fluoroalkyl groups, disk-shaped liquid crystalline compounds, and polymerizable compounds having long-chain aliphatic alkyl groups optionally having a branch structure.
Examples of the compound having the effect of effectively increasing the tilt angle of an optically anisotropic body to be formed at its air interface include cellulose nitrate, cellulose acetate, cellulose propionate, cellulose butyrate, rod-shaped liquid crystalline compounds modified with heteroaromatic ring salts, and rod-shaped liquid crystalline compounds modified with cyano groups and cyanoalkyl groups.
The polymerizable composition used in the present invention may contain a chain transfer agent in order to further improve adhesion of the polymer or the optically anisotropic body to a substrate. Examples of the chain transfer agent include: aromatic hydrocarbons; halogenated hydrocarbons such as chloroform, carbon tetrachloride, carbon tetrabromide, and bromotrichloromethane; mercaptan compounds such as octyl mercaptan, n-butyl mercaptan, n-pentyl mercaptan, n-hexadecyl mercaptan, n-tetradecyl mercaptan, n-dodecyl mercaptan, t-tetradecyl mercaptan, and t-dodecyl mercaptan; thiol compounds such as hexanedithiol, decanedithiol, 1,4-butanediol bisthiopropionate, 1,4-butanediol bisthioglycolate, ethylene glycol bisthioglycolate, ethylene glycol bisthiopropionate, trimethylolpropane tristhioglycolate, trimethylolpropane tristhiopropionate, trimethylolpropane tris(3-mercaptobutyrate), pentaerythritol tetrakisthioglycolate, pentaerythritol tetrakisthiopropionate, trimercaptopropionic acid tris(2-hydroxyethyl)isocyanurate, 1,4-dimethylmercaptobenzene, 2,4,6-trimercapto-s-triazine, and 2-(N,N-dibutylamino)-4,6-dimercapto-s-triazine; sulfide compounds such as dimethylxanthogen disulfide, diethylxanthogen disulfide, diisopropylxanthogen disulfide, tetramethylthiuram disulfide, tetraethylthiuram disulfide, and tetrabutylthiuram disulfide; N,N-dimethylaniline; N,N-divinylaniline; pentaphenylethane; an α-methylstyrene dimer; acrolein; allyl alcohol; terpinolene; α-terpinene; γ-terpinene; and dipentene. Of these, 2,4-diphenyl-4-methyl-1-pentene and thiol compounds are more preferred.
Specifically, compounds represented by general formulas (9-1) to (9-12) below are preferred:
In these formulas, R95 represents an alkyl group having 2 to 18 carbon atoms. The alkyl group may be linear or branched, and at least one methylene group in the alkyl group is optionally replaced by an oxygen atom, a sulfur atom, —CO—, —OCO—, —COO—, or —CH═CH—, provided that no oxygen atom is bonded directly to a sulfur atom. R96 represents an alkylene group having 2 to 18 carbon atoms, and at least one methylene group in the alkylene group is optionally replaced by an oxygen atom, a sulfur atom, —CO—, —OCO—, —COO—, or —CH═CH—, provided that no oxygen atom is bonded directly to a sulfur atom.
Preferably, the chain transfer agent is added in the step of mixing the polymerizable compounds with the organic solvent under heating and stirring to prepare a polymerizable solution. However, the chain transfer agent may be added in the subsequent step of mixing the polymerization initiator with the polymerizable solution or in both the steps.
The amount of the chain transfer agent added is preferably 0.5 to 10% by mass and more preferably 1.0 to 5.0% by mass with respect to the total mass of the polymerizable compounds contained in the polymerizable composition.
To control physical properties, a non-polymerizable liquid crystal compound etc. may also be added optionally. Preferably, the non-liquid crystalline polymerizable compound is added in the step of mixing the polymerizable compounds with the organic solvent under heating and stirring to prepare a polymerizable solution. However, the non-polymerizable liquid crystal compound etc. may be added in the subsequent step of mixing the polymerization initiator with the polymerizable solution or in both the steps. The amount of these compounds added is preferably 20% by mass or less, more preferably 10% by mass or less, and still more preferably 5% by mass or less with respect to the mass of the polymerizable composition.
The polymerizable composition used in the present invention may optionally contain an infrared absorber. No particular limitation is imposed on the infrared absorber used, and a commonly used infrared absorber may be contained so long as the alignment is not disturbed.
Examples of the infrared absorber include cyanine compounds, phthalocyanine compounds, naphthoquinone compounds, dithiol compounds, diimmonium compounds, azo compounds, and aluminum salts.
Specific examples include: a diimmonium salt-type infrared absorber “NIR-IM1” and an aluminum salt-type infrared absorber “NIR-AM1” (manufactured by Nagase ChemteX Corporation); “Karenz IR-T” and “Karenz IR-13F” (manufactured by Showa Denko K.K.); “YKR-2200” and “YKR-2100” (manufactured by Yamamoto Chemicals, Inc.); and “IRA 908,” “IRA 931,” “IRA 955,” and “IRA 1034” (INDECO).
The polymerizable composition used in the present invention may optionally contain an antistatic agent. No particular limitation is imposed on the antistatic agent used, and a commonly used antistatic agent may be contained so long as the alignment is not disturbed.
Examples of the antistatic agent include macromolecular compounds having at least one sulfonate group or phosphate group in their molecule, compounds including a quaternary ammonium salt, and surfactants having a polymerizable group.
Of these, surfactants having a polymerizable group are preferred. Examples of anionic surfactants having a polymerizable group include: alkyl ether-based surfactants such as “Antox SAD,” “Antox MS-2N” (manufactured by Nippon Nyukazai Co., Ltd.), “AQUALON KH-05,” “AQUALON KH-10,” “AQUALON KH-20,” “AQUALON KH-0530,” “AQUALON KH-1025” (manufactured by DAI-ICHI KOGYO SEIYAKU Co., Ltd.), “ADEKA REASOAP SR-10N,” “ADEKA REASOAP SR-20N” (manufactured by ADEKA CORPORATION), and “LATEMUL PD-104” (manufactured by Kao Corporation); sulfosuccinate-based surfactants such as “LATEMUL S-120,” “LATEMUL S-120A,” “LATEMUL S-180P,” “LATEMUL S-180A” (manufactured by Kao Corporation), and “ELEMINOL JS-2” (manufactured by Sanyo Chemical Industries, Ltd.); alkyl phenyl ether- and alkyl phenyl ester-based surfactants such as “AQUALON H-2855A,” “AQUALON H-3855B,” “AQUALON H-3855C,” “AQUALON H-3856,” “AQUALON HS-05,” “AQUALON HS-10,” “AQUALON HS-20,” “AQUALON HS-30,” “AQUALON HS-1025,” “AQUALON BC-05,” “AQUALON BC-10,” “AQUALON BC-20,” “AQUALON BC-1025,” “AQUALON BC-2020” (manufactured by DAI-ICHI KOGYO SEIYAKU Co., Ltd.) “ADEKA REASOAP SDX-222,” “ADEKA REASOAP SDX-223,” “ADEKA REASOAP SDX-232,” “ADEKA REASOAP SDX-233,” “ADEKA REASOAP SDX-259,” “ADEKA REASOAP SE-10N,” and “ADEKA REASOAP SE-20N” (manufactured by ADEKA CORPORATION); (meth)acrylate sulfate-based surfactants such as “Antox MS-60,” “Antox MS-2N” (manufactured by Nippon Nyukazai Co., Ltd.), and “ELEMINOL RS-30” (manufactured by Sanyo Chemical Industries, Ltd.); and phosphate-based surfactants such as “H-3330P” (manufactured by DAI-ICHI KOGYO SEIYAKU Co., Ltd.) and “ADEKA REASOAP PP-70” (manufactured by ADEKA CORPORATION).
Examples of nonionic surfactants having a polymerizable group include: alkyl ether-based surfactants such as “Antox LMA-20,” “Antox LMA-27,” “Antox EMH-20,” “Antox LMH-20, “Antox SMH-20” (manufactured by Nippon Nyukazai Co., Ltd.), “ADEKA REASOAP ER-10,” “ADEKA REASOAP ER-20,” “ADEKA REASOAP ER-30,” “ADEKA REASOAP ER-40” (manufactured by ADEKA CORPORATION), “LATEMUL PD-420,” “LATEMUL PD-430,” and “LATEMUL PD-450” (manufactured by Kao Corporation); alkyl phenyl ether- and alkyl phenyl ester-based surfactants such as “AQUALON RN-10,” “AQUALON RN-20,” “AQUALON RN-30,” “AQUALON RN-50,” “AQUALON RN-2025” (manufactured by DAI-ICHI KOGYO SEIYAKU Co., Ltd.), “ADEKA REASOAP NE-10,” “ADEKA REASOAP NE-20,” “ADEKA REASOAP NE-30,” and “ADEKA REASOAP NE-40” (manufactured by ADEKA CORPORATION); and (meth)acrylate sulfate-based surfactants such as “RMA-564,” “RMA-568,” and “RMA-1114” (manufactured by Nippon Nyukazai Co., Ltd.).
Other examples of the antistatic agent include polyethylene glycol (meth)acrylate, methoxypolyethylene glycol (meth)acrylate, ethoxypolyethylene glycol (meth)acrylate, propoxypolyethylene glycol (meth)acrylate, n-butoxypolyethylene glycol (meth)acrylate, n-pentoxypolyethylene glycol (meth)acrylate, phenoxypolyethylene glycol (meth)acrylate, polypropylene glycol (meth)acrylate, methoxypolypropylene glycol (meth)acrylate, ethoxypolypropylene glycol (meth)acrylate, propoxypolypropylene glycol (meth)acrylate, n-butoxypolypropylene glycol (meth)acrylate, n-pentoxypolypropylene glycol (meth)acrylate, phenoxypolypropylene glycol (meth)acrylate, polytetramethylene glycol (meth)acrylate, methoxypolytetramethylene glycol (meth)acrylate, phenoxytetraethylene glycol (meth)acrylate, hexaethylene glycol (meth)acrylate, and methoxyhexaethylene glycol (meth)acrylate.
Only one antistatic agent may be used, or a combination of two or more antistatic agents may be used. The amount of the antistatic agent added is preferably 0.001 to 10% by weight and more preferably 0.01 to 5% by weight with respect to the total weight of the polymerizable compounds contained in the polymerizable composition.
The polymerizable composition used in the present invention may optionally contain a pigment. No particular limitation is imposed on the pigment used, and a commonly used pigment may be used so long as the alignment is not disturbed.
Examples of the pigment include dichroic pigments and fluorescent pigments. Examples of the dichroic and fluorescent pigments include polyazo pigments, anthraquinone pigments, cyanine pigments, phthalocyanine pigments, perylene pigments, perinone pigments, and squarylium pigments. From the viewpoint of addition, the pigment is preferably a pigment having liquid crystallinity.
Examples of the pigment that can be used include pigments described in U.S. Pat. No. 2,400,877, pigments described in Dreyer J. F., Phys. and Colloid Chem., 1948, 52, 808., “The Fixing of Molecular Orientation,” pigments described in Dreyer J. F., Journal de Physique, 1969, 4, 114., “Light Polarization from Films of Lyotropic Nematic Liquid Crystals,” pigments described in J. Lydon, “Chromonics” in “Handbook of Liquid Crystals Vol. 2B: Low Molecular Weight Liquid Crystals II,” D. Demus, J. Goodby, G. W. Gray, H. W. Spiessm, V. Vill ed., Willey-VCH, P. 981-1007 (1998), pigments described in Dichroic Dyes for Liquid Crystal Display, A. V. Ivashchenko, CRC Press, 1994, and pigments described in “Novel Development of Functional Pigment Market,” Chapter 1, p. 1, 1994, CMC Publishing Co., Ltd.
Examples of the dichroic pigments include formula (d-1) to formula (d-8) below:
The amount of the pigment such as the dichroic pigment added is preferably 0.001 to 10% by weight and more preferably 0.01 to 5% by weight with respect to the total weight of the polymerizable compounds contained in the polymerizable composition.
The polymerizable composition used in the present invention may optionally contain a filler. No particular limitation is imposed on the filler used, and a commonly used filler may be used so long as the thermal conductivity of the polymer to be obtained is not impaired.
Examples of the filler include: inorganic fillers such as alumina, titanium white, aluminum hydroxide, talc, clay, mica, barium titanate, zinc oxide, and glass fibers; metal powders such as silver powder and copper powder; thermal conductive fillers such as aluminum nitride, boron nitride, silicon nitride, gallium nitride, silicon carbide, magnesia (aluminum oxide), alumina (aluminum oxide), crystalline silica (silicon oxide), and fused silica (silicon oxide); and silver nanoparticles.
The polymerizable composition of the present invention may contain a chiral compound for the purpose of obtaining a chiral nematic phase. It is unnecessary for the chiral compound itself to exhibit liquid crystallinity, and the chiral compound may or may not have a polymerizable group. The helical direction of the chiral compound may be appropriately selected according to the application purpose of the polymer.
No particular limitation is imposed on the chiral compound having a polymerizable group. A commonly used chiral compound may be used, but a chiral compound having a large helical twisting power (HTP) is preferred. The polymerizable group is preferably a vinyl group, a vinyloxy group, an allyl group, an allyloxy group, an acryloyloxy group, a methacryloyloxy group, a glycidyl group, or an oxetanyl group and particularly preferably an acryloyloxy group, a glycidyl group, or an oxetanyl group.
The amount of the chiral compound added must be appropriately controlled according to the helical twisting power of the compound. The amount of the chiral compound contained is preferably 0.5 to 80% by mass, more preferably 3 to 50% by mass, and particularly preferably 5 to 30% by mass with respect to the total mass of the chiral compound and the liquid crystalline compounds having a polymerizable group.
Specific examples of the chiral compound include compounds represented by general formula (10-1) to formula (10-4) below, but the chiral compound is not limited to the compounds represented by the general formulas below:
In the above formulas, Sp5a and Sp5b each independently represent an alkylene group having 0 to 18 carbon atoms, and the alkylene group may be substituted by at least one halogen atom, a CN group, or an alkyl group having 1 to 8 carbon atoms and having a polymerizable functional group. One CH2 group or two or more nonadjacent CH2 groups in the alkyl group may be each independently replaced by —O—, —S—, —NH—, —N(CH3)—, —CO—, —COO—, —OCO—, —OCOO—, —SCO—, —COS—, or —C≡C—, provided that no oxygen atoms are mutually bonded. A1, A2, A3, A4, A5, and A6 each independently represent a 1,4-phenylene group, a 1,4-cyclohexylene group, a 1,4-cyclohexenyl group, a tetrahydropyran-2,5-diyl group, a 1,3-dioxane-2,5-diyl group, a tetrahydrothiopyran-2,5-diyl group, a 1,4-bicyclo(2,2,2)octylene group, a decahydronaphthalene-2,6-diyl group, a pyridine-2,5-diyl group, a pyrimidine-2,5-diyl group, a pyrazine-2,5-diyl group, a thiophene-2,5-diyl group-, a 1,2,3,4-tetrahydronaphthalene-2,6-diyl group, a 2,6-naphthylene group, a phenanthrene-2,7-diyl group, a 9,10-dihydrophenanthrene-2,7-diyl group, a 1,2,3,4,4a,9,10a-octahydrophenanthrene-2,7-diyl group, a 1,4-naphthylene group, a benzo[1,2-b:4,5-b′]dithiophene-2,6-diyl group, a benzo[1,2-b:4,5-b′]diselenophene-2,6-diyl group, a [1]benzothieno[3,2-b]thiophene-2,7-diyl group, a [1]benzoselenopheno[3,2-b]selenophen-2,7-diyl group, or a fluorene-2,7-diyl group. n, l, and k each independently represent 0 or 1, provided that 0≦n+1+k≦3. m5 represents 0 or 1, and Z0, Z1, Z2, Z3, Z4, Z5, and Z6 each independently represent —COO—, —OCO—, —CH2 CH2—, —OCH2—, —CH2O—, —CH═CH—, —C≡C—, —CH═CHCOO—, —OCOCH═CH—, —CH2CH2COO—, —CH2CH2OCO—, —COOCH2CH2—, —OCOCH2CH2—, —CONH—, —NHCO—, an alkyl group having 2 to 10 carbon atoms and optionally having a halogen atom, or a single bond. R5a and R5b each represent a hydrogen atom, a halogen atom, a cyano group, or an alkyl group having 1 to 18 carbon atoms, and the alkyl group may be substituted by at least one halogen atom or CN. One CH2 group or two or more nonadjacent CH2 groups in the alkyl group may be each independently replaced by —O—, —S—, —NH—, —N(CH3)—, —CO—, —COO—, —OCO—, —OCOO—, —SCO—, —COS—, or —C≡C—, provided that no oxygen atoms are mutually bonded. Alternatively, R5a and R5b each represent general formula (10-a):
[Chem. 112]
—P5a (10-a)
(wherein P5a represents a polymerizable group, and the meaning of Sp5a is the same as the meaning of Sp1).
P5a represents a substituent selected from polymerizable groups represented by formula (P-1) to formula (P-20) below:
Other specific examples of the chiral compound include compounds represented by general formula (10-5) to formula (10-39) below:
In the above formulas, m and n each independently represent an integer of 1 to 10, and R represents a hydrogen atom, an alkyl group having 1 to 10 carbon atoms, or a fluorine atom. When a plurality of Rs are present, they may be the same or different.
Specific examples of the chiral compound having no polymerizable group include: cholesterol pelargonate and cholesterol stearate that have a cholesteryl group as a chiral group; “CB-15” and “C-15” manufactured by BDH, “S-1082” manufactured by Merck, and “CM-19,” “CM-20,” and “CM” manufactured by Chisso Corporation, each of which has a 2-methylbutyl group as a chiral group; and “S-811” manufactured by Merck and “CM-21” and “CM-22” manufactured by Chisso Corporation, each of which has a 1-methylheptyl group as a chiral group.
When the chiral compound is added, the amount of the chiral compound added is controlled such that a value obtained by dividing the thickness (d) of the polymer to be obtained by the helix pitch (P) of the polymer, i.e., (d/P), is in the range of preferably 0.1 to 100 and more preferably 0.1 to 20, but this depends on the intended purpose of the polymer of the polymerizable composition of the present invention.
A compound that has a polymerizable group but is not a liquid crystal compound may be added to the polymerizable composition of the present invention. No particular limitation is imposed on the above compound, so long as the compound used is commonly recognized as a polymerizable monomer or a polymerizable oligomer in the present technical field. When the non-liquid crystalline compound is added, its amount is preferably 15% by mass or less and more preferably 10% by mass or less with respect to the total amount of the polymerizable compounds used in the polymerizable composition of the present invention.
Specific examples include: mono(meth)acrylates such as methyl (meth)acrylate, ethyl (meth)acrylate, 2-hydroxyethyl acrylate, propyl (meth)acrylate, 2-hydroxypropyl (meth)acrylate, butyl (meth)acrylate, isobutyl (meth)acrylate, 4-hydroxybutyl (meth)acrylate, 2-hydroxybutyl (meth)acrylate, octyl (meth)acrylate, 2-ethylhexyl (meth)acrylate, dodecyl (meth)acrylate, stearyl (meth)acrylate, cyclohexyl (meth)acrylate, dicyclopentanyloxylethyl (meth)acrylate, isobornyloxylethyl (meth)acrylate, isobornyl (meth)acrylate, adamantyl (meth)acrylate, dimethyladamantyl (meth)acrylate, dicyclopentanyl (meth)acrylate, dicyclopentenyl (meth)acrylate, methoxyethyl (meth)acrylate, ethylcarbitol (meth)acrylate, tetrahydrofurfuryl (meth)acrylate, benzyl (meth)acrylate, phenoxyethyl (meth)acrylate, 2-phenoxydiethylene glycol (meth)acrylate, 2-hydroxy-3-phenoxyethyl (meth)acrylate, (2-methyl-2-ethyl-1,3-dioxolan-4-yl)methyl (meth)acrylate, (3-ethyloxetan-3-yl)methyl (meth)acrylate, o-phenylphenolethoxy (meth)acrylate, dimethylamino (meth)acrylate, diethylamino (meth)acrylate, 2,2,3,3,3-pentafluoropropyl (meth)acrylate, 2,2,3,4,4,4-hexafluorobutyl (meth)acrylate, 2,2,3,3,4,4,4-heptafluorobutyl (meth)acrylate, 2-(perfluorobutyl)ethyl (meth)acrylate, 2-(perfluorohexyl)ethyl (meth)acrylate, 1H, 1H, 3H-tetrafluoropropyl (meth)acrylate, 1H,1H,5H-octafluoropentyl (meth)acrylate, 1H,1H,7H-dodecafluoroheptyl (meth)acrylate, 1H-1-(trifluoromethyl)trifluoroethyl (meth)acrylate, 1H,1H,3H-hexafluorobutyl (meth)acrylate, 1,2,2,2-tetrafluoro-1-(trifluoromethyl)ethyl (meth)acrylate, 1H,1H-pentadecafluorooctyl (meth)acrylate, 1H, H,2H,2H-tridecafluorooctyl (meth)acrylate, 2-(meth)acryloyloxyethyl phthalate, 2-(meth)acryloyloxyethylhexahydro phthalate, glycidyl (meth)acrylate, 2-(meth)acryloyloxyethyl phosphate, acryloylmorpholine, dimethylacrylamide, dimethylaminopropylacrylamide, isopropylacrylamide, diethylacrylamide, hydroxyethylacrylamide, and N-acryloyloxyethylhexahydrophthalimide; diacrylates such as 1,4-butanediol di(meth)acrylate, 1,6-hexanediol di(meth)acrylate, 1,9-nonanediol di(meth)acrylate, neopentyldiol di(meth)acrylate, tripropylene glycol di(meth)acrylate, ethylene glycol di(meth)acrylate, diethylene glycol di(meth)acrylate, triethylene glycol di(meth)acrylate, ethylene oxide-modified bisphenol A di(meth)acrylate, tricyclodecanedimethanol di(meth)acrylate, 9,9-bis[4-(2-acryloyloxyethoxy)phenyl]fluorene, glycerin di(meth)acrylate, 2-hydroxy-3-acryloyloxypropyl methacrylate, an acrylic acid adduct of 1,6-hexanediol diglycidyl ether, and an acrylic acid adduct of 1,4-butanediol diglycidyl ether; tri(meth)acrylates such as trimethylolpropane tri(meth)acrylate, ethoxylated isocyanuric acid triacrylate, pentaerythritol tri(meth)acrylate, and ε-caprolactone-modified tris-(2-acryloyloxyethyl)isocyanurate; tetra(meth)acrylates such as pentaerythritol tetra(meth)acrylate and ditrimethylolpropane tetra(meth)acrylate; dipentaerythritol hexa(meth)acrylate; oligomer-type (meth)acrylates; various urethane acrylates; various macromonomers; epoxy compounds such as ethylene glycol diglycidyl ether, diethylene glycol diglycidyl ether, propylene glycol diglycidyl ether, neopentyl glycol diglycidyl ether, 1,6-hexanediol diglycidyl ether, glycerin diglycidyl ether, and bisphenol A diglycidyl ether; and maleimide. These may be used alone or may be used as a mixture of two or more.
The polymerizable composition used in the present invention may contain a liquid crystalline compound having at least one polymerizable group other than the liquid crystalline compounds of general formula (1) to general formula (7). If the amount of such a liquid crystalline compound added is excessively large, the retardation ratio of a retardation plate prepared using the polymerizable composition may become large. Therefore, when the above liquid crystalline compound is added, its amount is preferably 30% by mass or less, more preferably 10% by mass or less, and particularly preferably 5% by mass or less with respect to the total mass of the polymerizable compounds used in the polymerizable composition of the present invention.
Examples of the above liquid crystal compound include liquid crystal compounds represented by general formula (1-b) to general formula (7-b):
(wherein P11 to P74 each represent a polymerizable group; S11 to S72 each represent a spacer group or a single bond; when a plurality of S11s to S72s are present, they may be the same or different; X11 to X72 each represent —O—, —S—, —OCH2—, —CH2O—, —CO—, —COO—, —OCO—, —CO—S—, —S—CO—, —O—CO—O—, —CO—NH—, —NH—CO—, —SCH2—, —CH2S—, —CF2O—, —OCF2—, —CF2S—, —SCF2—, —CH═CH—COO—, —CH═CH—OCO—, —COO—CH═CH—, —OCO—CH═CH—, —COO-CH2CH2—, —OCO—CH2CH2—, —CH2CH—COO—, —CH2CH2—OCO—, —COO—CH2—, —OCO—CH2—, —CH2—COO—, —CH2—OCO—, —CH═CH—, —N═N—, —CH═N—N═CH—, —CF═CF—, —C≡C—, or a single bond (provided that each P—(S—X)— bond contains no —O—O—); when a plurality of X11s to X72s are present, they may be the same or different; MG11 to MG71 each independently represent formula (b):
(wherein A83 and A84 each independently represent a 1,4-phenylene group, a 1,4-cyclohexylene group, a pyridine-2,5-diyl group, a pyrimidine-2,5-diyl group, a naphthalene-2,6-diyl group, a naphthalene-1,4-diyl group, a tetrahydronaphthalene-2,6-diyl group, a decahydronaphthalene-2,6-diyl group, or a 1,3-dioxane-2,5-diyl group, each of which may be unsubstituted or substituted by at least one L2; when a plurality of A83s and/or A84s are present, they may be the same or different;
Z83 and Z84 each independently represent —O—, —S—, —OCH2—, —CH2O—, —CH2CH2—, —CO—, —COO—, —OCO—, —CO—S—, —S—CO—, —O—CO—O—, —CO—NH—, —NH—CO—, —SCH2—, —CH2S—, —CF2O—, —OCF2—, —CF2S—, —SCF2—, —CH═CH—COO—, —CH═CH—OCO—, —COO—CH═CH—, —OCO—CH═CH—, —COO—CH2CH2—, —OCO—CH2CH2—, —CH2CH2—COO—, —CH2CH2—OCO—, —COO—CH2—, —OCO—CH2—, —CH2—COO—, —CH2—OCO—, —CH═CH—, —N═N—, —CH═N—, —N═CH—, —CH═N—N═CH—, —CF═CF—, —C≡C—, or a single bond; when a plurality of Z33s and/or Z84s are present, they may be the same or different;
M81 is a group selected from a 1,4-phenylene group, a 1,4-cyclohexylene group, a 1,4-cyclohexenyl group, a tetrahydropyran-2,5-diyl group, a 1,3-dioxane-2,5-diyl group, a tetrahydrothiopyran-2,5-diyl group, a 1,4-bicyclo(2,2,2)octylene group, a decahydronaphthalene-2,6-diyl group, a pyridine-2,5-diyl group, a pyrimidine-2,5-diyl group, a pyrazine-2,5-diyl group, a thiophene-2,5-diyl group-, a 1,2,3,4-tetrahydronaphthalene-2,6-diyl group, a naphthylene-1,4-diyl group, a naphthylene-1,5-diyl group, a naphthylene-1,6-diyl group, a naphthylene-2,6-diyl group, a phenanthrene-2,7-diyl group, a 9,10-dihydrophenanthrene-2,7-diyl group, a 1,2,3,4,4a,9,10a-octahydrophenanthrene-2,7-diyl group, a benzo[1,2-b:4,5-b′]dithiophene-2,6-diyl group, a benzo[1,2-b:4,5-b′]diselenophen-2,6-diyl group, a [1]benzothieno[3,2-b]thiophene-2,7-diyl group, a [1]benzoselenopheno[3,2-b]selenophen-2,7-diyl group, and a fluorene-2,7-diyl group, each of which may be unsubstituted or substituted by at least one L2;
L2 represents a fluorine atom, a chlorine atom, a bromine atom, an iodine atom, a pentafluorosulfuranyl group, a nitro group, an isocyano group, an amino group, a hydroxyl group, a mercapto group, a methylamino group, a dimethylamino group, a diethylamino group, a diisopropylamino group, a trimethylsilyl group, a dimethylsilyl group, a thioisocyano group, or an alkyl group having 1 to 20 carbon atoms, the alkyl group being linear or branched, any hydrogen atom in the alkyl group being optionally replaced by a fluorine atom, one —CH2— group or two or more nonadjacent —CH2— groups in the alkyl group being each independently optionally replaced by a group selected from —O—, —S—, —CO—, —COO—, —OCO—, —CO—S—, —S—CO—, —O—CO—O—, —CO—NH—, —NH—CO—, —CH═CH—COO—, —CH═CH—OCO—, —COO—CH═CH—, —OCO—CH═CH—, —CH═CH—, —CF═CF—, and —C≡C—; when a plurality of L2s are present in the compound, they may be the same or different; m represents an integer from 0 to 8; and j83 and j84 each independently represent an integer from 0 to 5 while j83+j84 represents an integer from 1 to 5); R11 and R31 each represent a hydrogen atom, a fluorine atom, a chlorine atom, a bromine atom, an iodine atom, a pentafluorosulfuranyl group, a cyano group, a nitro group, an isocyano group, a thioisocyano group, or an alkyl group having 1 to 20 carbon atoms, the alkyl group being linear or branched, any hydrogen atom in the alkyl group being optionally replaced by a fluorine atom, one —CH2— group or two or more nonadjacent —CH2— groups in the alkyl group being each independently optionally replaced by —O—, —S—, —CO—, —COO—, —OCO—, —CO—S—, —S—CO—, —O—CO—O—, —CO—NH—, —NH—CO—, or —C≡C—; m11 represents an integer of 0 to 8; m2 to m7, n2 to n7, 14 to 16, and k6 each independently represent an integer from 0 to 5; but general formula (1) to general formula (7) are excluded).
Specific examples of the compound represented by general formula (1-b) include compounds represented by formula (1-b-1) to formula (1-b-39) below:
(wherein m11 and n11 each independently represent an integer of 1 to 10; R111 and R112 each independently represent a hydrogen atom, an alkyl group having 1 to 10 carbon atoms, or a fluorine atom; R113 represents a hydrogen atom, a fluorine atom, a chlorine atom, a bromine atom, an iodine atom, a pentafluorosulfuranyl group, a cyano group, a nitro group, an isocyano group, a thioisocyano group, or a linear or branched alkyl group which has 1 to 20 carbon atoms and in which one —CH2— group or two or more nonadjacent —CH2— groups may be each independently replaced by —O—, —S—, —CO—, —COO—, —OCO—, —CO—S—, —S—CO—, —O—CO—O—, —CO—NH—, —NH—CO—, or —C≡C—; and any hydrogen atom in the alkyl group may be replaced by a fluorine atom). These liquid crystal compounds may be used alone or may be used as a mixture of two or more.
Specific examples of the compound represented by general formula (2-b) include compounds represented by formula (2-b-1) to formula (2-b-33) below:
(wherein m and n each independently represent an integer of 1 to 18, and R represents a hydrogen atom, a halogen atom, an alkyl group having 1 to 6 carbon atoms, an alkoxy group having 1 to 6 carbon atoms, or a cyano group. When R is an alkyl group having 1 to 6 carbon atoms or an alkoxy group having 1 to 6 carbon atoms, R may be unsubstituted or substituted by one or at least two halogen atoms). These liquid crystal compounds may be used alone or may be used as a mixture of two or more.
Specific examples of the compound represented by general formula (3-b) include compounds represented by formula (3-b-1) to formula (3-b-16) below:
These liquid crystalline compounds may be used alone or as a mixture of two or more.
Specific examples of the compound represented by general formula (4-b) include compounds represented by formula (4-b-1) to formula (4-b-29) below:
(wherein m and n each independently represent an integer of 1 to 10. R represents a hydrogen atom, a halogen atom, an alkyl group having 1 to 6 carbon atoms, an alkoxy group having 1 to 6 carbon atoms, or a cyano group. When R is an alkyl group having 1 to 6 carbon atoms or an alkoxy group having 1 to 6 carbon atoms, R may be unsubstituted or substituted by one or at least two halogen atoms). These liquid crystalline compounds may be used alone or as a mixture of two or more.
Specific examples of the compound represented by general formula (5-b) include compounds represented by formula (5-b-1) to formula (5-b-26) below:
(wherein each n independently represents an integer of 1 to 10. R represents a hydrogen atom, a halogen atom, an alkyl group having 1 to 6 carbon atoms, an alkoxy group having 1 to 6 carbon atoms, or a cyano group. When R is an alkyl group having 1 to 6 carbon atoms or an alkoxy group having 1 to 6 carbon atoms, R may be unsubstituted or substituted by one or at least two halogen atoms). These liquid crystalline compounds may be used alone or may be used as a mixture of two or more.
Specific examples of the compound represented by general formula (6-b) include compounds represented by formula (6-b-1) to formula (6-b-23) below:
(wherein k, L, m, and n each independently represent an integer of 1 to 10. R represents a hydrogen atom, a halogen atom, an alkyl group having 1 to 6 carbon atoms, an alkoxy group having 1 to 6 carbon atoms, or a cyano group. When R is an alkyl group having 1 to 6 carbon atoms or an alkoxy group having 1 to 6 carbon atoms, R may be unsubstituted or substituted by one or at least two halogen atoms). These liquid crystalline compounds may be used alone or may be used as a mixture of two or more.
Specific examples of the compound represented by general formula (7-b) include compounds represented by formula (7-b-1) to formula (7-b-25) below:
(wherein R represents a hydrogen atom, a halogen atom, an alkyl group having 1 to 6 carbon atoms, an alkoxy group having 1 to 6 carbon atoms, or a cyano group. When R is an alkyl group having 1 to 6 carbon atoms or an alkoxy group having 1 to 6 carbon atoms, R may be unsubstituted or substituted by one or at least two halogen atoms). These liquid crystalline compounds may be used alone or may be used as a mixture of two or more.
The polymerizable composition of the present invention may contain an alignment material that improves alignment, for the purpose of improving the alignment. The alignment material used may be any commonly used alignment material so long as it is soluble in a solvent that can dissolve the liquid crystalline compounds having a polymerizable group and used in the polymerizable composition of the present invention. The alignment material may be added in such an amount that the alignment is not significantly impaired. Specifically, the amount of the alignment material is preferably 0.05 to 30% by weight, more preferably 0.5 to 15% by weight, and particularly preferably 1 to 10% by weight with respect to the total weight of the polymerizable liquid crystalline compounds contained in the polymerizable liquid crystal composition.
Specific examples of the alignment material include photoisomerizable or photodimerizable compounds such as polyimides, polyamides, BCB (benzocyclobutene polymers), polyvinyl alcohols, polycarbonates, polystyrenes, polyphenylene ethers, polyarylates, polyethylene terephthalates, polyethersulfones, epoxy resins, epoxy acrylate resins, acrylic resins, coumarin compounds, chalcone compounds, cinnamate compounds, fulgide compounds, anthraquinone compounds, azo compounds, and arylethene compounds. Of these, materials aligned by UV irradiation or visible light irradiation (photo-alignment materials) are preferred.
Examples of the photo-alignment material include polyimides having cyclic alkanes, wholly aromatic polyarylates, polyvinyl cinnamate and a polyvinyl ester of p-methoxycinnamic acid shown in Japanese Unexamined Patent Application Publication No. 5-232473, cinnamate derivatives shown in Japanese Unexamined Patent Application Publications Nos. 6-287453 and 6-289374, and maleimide derivatives shown in Japanese Unexamined Patent Application Publication No. 2002-265541. Preferred specific examples include compounds represented by formula (12-1) to formula (12-7) below:
(wherein R represents a hydrogen atom, a halogen atom, an alkyl group having 1 to 3 carbon atoms, an alkoxy group, or a nitro group; R′ represents a hydrogen atom or an alkyl group having 1 to 10 carbon atoms, the alkyl group being linear or branched, any hydrogen atom in the alkyl group being optionally replaced by a fluorine atom, one —CH2— group or two or more nonadjacent —CH2— groups in the alkyl group being each independently optionally replaced by —O—, —S—, —CO—, —COO—, —OCO—, —CO—S—, —S—CO—, —O—CO—O—, —CO—NH—, —NH—CO—, or —C≡C—; and a terminal CH3 may be replaced by CF3, CCl3, a cyano group, a nitro group, an isocyano group, or a thioisocyano group. n represents 4 to 100,000, and m represents an integer of 1 to 10).
The polymer of the present invention is obtained by polymerizing the polymerizable composition of the present invention with the initiator contained in the polymerizable composition. The polymer of the present invention is used for optically anisotropic bodies, retardation films, lenses, coloring agents, printed materials, etc.
The optically anisotropic body of the present invention is obtained by applying the polymerizable composition of the present invention to a substrate or a substrate having an alignment function, aligning liquid crystal molecules in the polymerizable liquid crystal composition of the present invention uniformly while a nematic phase or a smectic phase is maintained, and then polymerizing the polymerizable liquid crystal composition.
No particular limitation is imposed on the substrate used for the optically anisotropic body of the present invention, so long as the substrate is commonly used for liquid crystal display devices, organic light-emitting display devices, other display devices, optical components, coloring agents, markings, printed materials, and optical films and formed of a heat resistant material that can resist heat during drying after application of a solution of the polymerizable composition of the present invention. Examples of such a substrate include glass substrates, metal substrates, ceramic substrates, and organic materials such as plastic substrate and paper. In particular, when the substrate is formed of an organic material, examples of the organic material include cellulose derivatives, polyolefins, polyesters, polyolefins, polycarbonates, polyacrylates, polyarylates, polyethersulfones, polyimides, polyphenylene sulfides, polyphenylene ethers, nylon, and polystyrenes. Of these, plastic substrates such as polyesters, polystyrenes, polyolefins, cellulose derivatives, polyarylates, and polycarbonates are preferred. The shape of the substrate may be a flat plate shape and may also be a shape with a curved surface. If necessary, the substrate may include an electrode layer and have an antireflective function or a reflecting function.
To improve the ease of application of the polymerizable composition of the present invention and to improve its adhesion to the polymer, the substrate may be subjected to surface treatment. Examples of the surface treatment include ozone treatment, plasma treatment, corona treatment, and silane coupling treatment. To control light transmittance and light reflectance, an organic thin film, an inorganic oxide thin film, a metal thin film, etc. may be provided on the surface of the substrate by, for example, vapor deposition. To give optical added value, the substrate may be a pickup lens, a rod lens, an optical disk, a retardation film, a light diffusion film, a color filter, etc. In particular, a pickup lens, a retardation film, a light diffusion film, and a color filter are preferable because of higher added value.
To allow the polymerizable composition of the present invention to be aligned after the polymerizable composition is applied and dried, the substrate has generally been subjected to alignment treatment, or an alignment film may be disposed on the substrate. Examples of the alignment treatment include stretching treatment, rubbing treatment, polarized UV-visible light irradiation treatment, ion beam treatment, and oblique deposition of SiO2 on the substrate. The alignment film used may be a commonly used alignment film. Examples of such an alignment film include: compounds such as polyimides, polysiloxanes, polyamides, polyvinyl alcohols, polycarbonates, polystyrenes, polyphenylene ethers, polyarylates, polyethylene terephthalates, polyethersulfones, epoxy resins, epoxy acrylate resins, acrylic resins, azo compounds, coumarin compounds, chalcone compounds, cinnamate compounds, fulgide compounds, anthraquinone compounds, azo compounds, and arylethene compounds; and polymers and copolymers of these compounds. When rubbing is used for the alignment treatment of a compound, it is preferable that the crystallization of the compound is facilitated by the alignment treatment or a heating process performed after the alignment treatment. When the alignment treatment performed is other than rubbing, the compound used is preferably a photo-alignment material.
Generally, when a liquid crystal composition is brought into contact with a substrate having an alignment function, liquid crystal molecules located near the substrate are aligned in a direction of the alignment treatment performed on the substrate. Whether the liquid crystal molecules are aligned horizontally, inclined, or perpendicularly to the substrate is largely affected by the method of the alignment treatment performed on the substrate. For example, when an alignment film with a very small pretilt angle that is used for in-plane switching (IPS) liquid crystal display devices is disposed on the substrate, a polymerizable liquid crystal layer aligned substantially horizontally is obtained.
When an alignment film used for TN liquid crystal display devices is disposed on the substrate, a polymerizable liquid crystal layer with slightly inclined alignment is obtained. When an alignment film used for STN liquid crystal display devices is used, a polymerizable liquid crystal layer with largely inclined alignment is obtained.
A commonly used coating method may be used to obtain the optically anisotropic body of the present invention, and examples of the coating method include an applicator method, a bar coating method, a spin coating method, a roll coating method, a direct gravure coating method, a reverse gravure coating method, a flexographic coating method, an inkjet method, a die coating method, a cap coating method, a dip coating method, a slit coating method, and a spray coating method. After the polymerizable composition is applied, the composition is dried.
It is preferable that, after the application of the polymerizable composition of the present invention, the liquid crystal molecules in the composition are uniformly aligned while a smectic phase or a nematic phase is maintained. One example of the alignment method is a heat treatment method. Specifically, after the polymerizable composition of the present invention is applied to the substrate, the polymerizable composition is heated to a temperature equal to or higher than the N (nematic phase)-I (isotropic liquid phase) transition temperature (hereinafter abbreviated as the N-I transition temperature) of the liquid crystal composition to bring the liquid crystal composition into the isotropic liquid state. Then, if necessary, the liquid crystal composition is gradually cooled, and the nematic phase thereby appears. In this case, it is preferable that the temperature is temporarily held at the temperature at which the liquid crystal phase appears. This allows liquid crystal phase domains to grow sufficiently, so that a monodomain is formed. Alternatively, after the polymerizable composition of the present invention is applied to the substrate, heat treatment is performed such that the temperature is held constant for a certain time within the temperature range in which the nematic phase of the polymerizable composition of the present invention appears.
If the heating temperature is excessively high, the polymerizable liquid crystal compound may undergo a non-preferable polymerization reaction and thereby deteriorate. If the polymerizable composition is cooled excessively, the polymerizable composition may undergo phase separation. In this case, crystals may precipitate, or a higher-order liquid crystal phase such as a smectic phase may appear, and it may be impossible to complete the alignment treatment.
With the above heat treatment, the optically anisotropic body produced is more uniform and has less alignment defects than optically anisotropic bodies produced by a simple application method.
After the uniform alignment treatment is performed as described above, the polymerizable composition may be cooled to the lowest possible temperature at which the liquid crystal phase does not undergo phase separation, i.e., until the polymerizable composition is supercooled. By polymerizing the polymerizable liquid crystalline compound at this temperature with the liquid crystal phase aligned, an optically anisotropic body with high alignment order and excellent transparency can be obtained.
The dried polymerizable composition uniformly aligned is subjected to polymerization treatment generally by irradiation with visible-UV light or heating. Specifically, when light irradiation is used for the polymerization, irradiation with visible-UV light of 420 nm or less is preferable, and irradiation with UV light having a wavelength of 250 to 370 nm is most preferable. If the polymerizable composition is, for example, decomposed under the visible-UV light of 420 nm or less, it is sometimes preferable to perform the polymerization treatment with visible-UV light of 420 nm or more.
Examples of the method for polymerizing the polymerizable composition of the present invention include an active energy ray irradiation method and a thermal polymerization method. The active energy ray irradiation method is preferred because the reaction proceeds at room temperature without heating. In particular, a method including irradiation with light such as UV light is preferable because of its simple procedure. The temperature during irradiation is set such that the polymerizable composition of the present invention can maintain its liquid crystal phase. It is preferable, if at all possible, to hold the temperature at 30° C. or lower, in order to avoid induction of thermal polymerization of the polymerizable composition. Generally, in the course of heating, the polymerizable liquid crystal composition is in the liquid crystal phase within the range of from C (solid)-N(nematic) transition temperature (hereinafter abbreviated as the C-N transition temperature) to the N-I transition temperature. However, in the course of cooling, the polymerizable liquid crystal composition is in a thermodynamically non-equilibrium state, and thus the liquid crystal state may be maintained without solidification even at the C-N transition temperature or lower. This state is referred to as a supercooled state. In the present invention, the supercooled state of the liquid crystal composition is also regarded as the state in which the liquid crystal phase is maintained. Specifically, irradiation with UV light of 390 nm or less is preferable, and irradiation with light having a wavelength of 250 to 370 nm is most preferable. However, if the polymerizable composition is, for example, decomposed under UV light of 390 nm or less, it is sometimes preferable to perform the polymerization treatment with UV light of 390 nm or more. Preferably, the light used is diffused light and is unpolarized light. The irradiation intensity of the UV light is preferably within the range of 0.05 kW/m2 to 10 kW/m2. The irradiation intensity of the UV light is particularly preferably within the range of 0.2 kW/m2 to 2 kW/m2. If the intensity of the UV light is less than 0.05 kW/m2, a considerable time is required to complete the polymerization. If the intensity exceeds 2 kW/m2, the liquid crystal molecules in the polymerizable composition tend to undergo photo-decomposition, and a large amount of polymerization heat is generated. In this case, the temperature during polymerization increases, and the order parameter of the polymerizable liquid crystal varies, so that the retardation of the film after polymerization may deviate from the intended retardation.
An optically anisotropic body having a plurality of regions with different alignment directions may be obtained by polymerizing only specific potions under UV irradiation using a mask, changing the alignment state of the unpolymerized portions by application of an electric field, a magnetic field, temperature, etc., and then polymerizing the unpolymerized portions.
When only the specific portions are polymerized under UV irradiation using the mask, an electric field, a magnetic field, temperature, etc. may be applied in advance to the unpolymerized polymerizable liquid crystal composition to control alignment, and the polymerizable liquid crystal composition in this state may be irradiated with light through the mask to polymerize the polymerizable composition. An optically anisotropic body having a plurality of regions with different alignment directions may also be obtained in the manner described above.
The optically anisotropic body obtained by polymerization of the polymerizable liquid crystal composition of the present invention may be separated from the substrate, and the separated optically anisotropic body may be used alone. The optically anisotropic body may not be separated from the substrate, and the optically anisotropic body with the substrate may be used. In particular, since the optically anisotropic body is unlikely to contaminate other members, the optically anisotropic body is useful for a substrate for deposition and is also useful when another substrate is laminated onto the optically anisotropic body.
The retardation film of the present invention includes the optically anisotropic body described above. The liquid crystalline compound forms a continuous uniform alignment state on the substrate, and the retardation film has in-plane or out-of-plane (with respect to the substrate) biaxiality or both in-plane biaxiality and out-of-plane biaxiality or has in-plane biaxiality. An adhesive or an adhesive layer, a bonding agent or a bonding layer, a protective film, a polarizing film, etc. may be stacked.
Examples of the alignment mode applicable to the above retardation film include a positive-A plate in which a rod-shaped liquid crystalline compound is aligned substantially horizontally with respect to substrates, a negative A-plate in which a uniaxially arranged disk-shaped liquid crystalline compound is aligned vertically to substrates, a positive C-plate in which a rod-shaped liquid crystalline compound is aligned substantially vertically to substrates, a negative C-plate in which a rod-shaped liquid crystalline compound is aligned in cholesteric alignment with respect to substrates or a uniaxially arranged disk-shaped liquid crystalline compound is aligned horizontally to substrates, a biaxial plate, a positive O-plate in which a rod-shaped liquid crystalline compound is aligned in hybrid alignment with respect to substrates, and a negative O-plate in which a disk-shaped liquid crystalline compound is aligned in hybrid alignment with respect to substrates. When the retardation film is used for a liquid crystal display device, no particular limitation is imposed on the alignment mode so long as viewing angle dependence is improved, and any of various modes can be applied.
For example, the alignment mode applied may be the positive A-plate, the negative A-plate, the positive C-plate, the negative C-plate, the biaxial plate, the positive O-plate, or the negative O-plate. Of these, the positive A-plate and the negative C-plate are preferably used. It is more preferable to stack the positive A-plate and the negative C-plate.
The positive A-plate means an optically anisotropic body in which a polymerizable liquid crystal composition is homogeneously aligned. The negative C-plate means an optically anisotropic body in which a polymerizable liquid crystal composition is aligned in cholesteric alignment.
In a liquid crystal cell using a retardation film, it is preferable to use a positive A-plate as a first retardation layer, in order to compensate for viewing angle dependence of polarizing axis orthogonality to thereby increase the viewing angle. In the positive A-plate, the relation “nx>ny=nz” holds, where nx is the refractive index in the direction of an in-plane slow axis of the film, ny is the refractive index in the direction of an in-plane fast axis of the film, and nz is the refractive index in the direction of the thickness of the film. Preferably, the in-plane retardation value of the positive A-plate at a wavelength of 550 nm is within the range of 30 to 500 nm. No particular limitation is imposed on the retardation value in the thickness direction. Preferably, an Nz coefficient is within the range of 0.9 to 1.1.
To eliminate the birefringence of the liquid crystal molecules themselves, it is preferable to use, as a second retardation layer, a so-called negative C-plate having negative refractive index anisotropy. The negative C-plate may be stacked on the positive A-plate.
The negative C-plate is a retardation layer satisfying the relation “nx=ny>nz,” where nx is the refractive index of the retardation layer in the direction of its in-plane slow axis, ny is the refractive index of the retardation layer in the direction of its in-plane fast axis, and nz is the refractive index of the retardation layer in its thickness direction. Preferably, the retardation value of the negative C-plate in the direction of its thickness is within the range of 20 to 400 nm.
The refractive index anisotropy in the thickness direction is represented by a retardation value Rth in the thickness direction represented by formula (2) below. The retardation value Rth in the thickness direction can be computed as follows. nx, ny, and nz are determined by numerical computation from formulas (1) and (4) to (7) using an in-plane retardation value R0, a retardation value R50 measured at an inclination of 50° with the slow axis serving as an inclination axis, the thickness d of the film, and the average refractive index n0 of the film. Then the nx, ny, and nz determined are substituted into formula (2). The Nz coefficient can be computed from formula (3). The same applies to the rest of the present description.
R
0=(nx−ny)×d (1)
Rth=[(nx+ny)/2−nz]×d (2)
Nz coefficient=(nx−nz)/(nx−ny) (3)
R
50=(nx−ny′)×d/cos(φ) (4)
(nx+ny+nz)/3=n0 (5)
Here,
φ=sin−1[ sin(50°)/n0] (6)
ny′=ny×nz/[ny
2×sin2(φ)+nz2×cos2(φ)]1/2 (7)
In many commercial retardation measurement devices, the above numerical computation is performed automatically in the devices, and the in-plane retardation value R0, the retardation value Rth in the thickness direction, etc. are automatically displayed. Examples of such a measurement device include RETS-100 (manufactured by Otsuka Chemical Co., Ltd.).
The polymerizable composition of the present invention can be used for the lens of the present invention. Specifically, the polymerizable composition is applied to a substrate or a substrate having the alignment function or injected into a lens-shaped die, aligned uniformly while the nematic phase or the smectic phase is maintained, and then polymerized. Examples of the shape of the lens include simple cell shapes, prism shapes, and lenticular shapes.
The polymerizable composition of the present invention can be used for the liquid crystal display device of the present invention. Specifically, the polymerizable composition is applied to a substrate or a substrate having the alignment function, aligned uniformly while the nematic phase or the smectic phase is maintained, and then polymerized. The polymerizable composition may be used in the form of, for example, an optical compensation film, a patterned retardation film for liquid crystal stereoscopic display devices, a retardation correction layer for color filters, an overcoat layer, or an alignment film for liquid crystal mediums. In a liquid crystal display device, at least a liquid crystal medium layer, a TFT driving circuit, a black matrix layer, a color filter layer, a spacer, and an electrode circuit suitable for the liquid crystal medium layer are held between at least two substrates. An optical compensation layer, a polarizing plate layer, and a touch panel layer are generally disposed outside the two substrates. However, the optical compensation layer, an overcoat layer, the polarizing plate layer, and an electrode layer for the touch panel may be held between the two substrates.
Examples of the alignment mode of the liquid crystal display device include a TN mode, a VA mode, an IPS mode, an FFS mode, and an OCB mode. When the polymerizable composition is used for an optical compensation film or an optical compensation layer, a film having a retardation suitable for the alignment mode can be produced. When the polymerizable composition is used for a patterned retardation film, it is only necessary that the liquid crystalline compound in the polymerizable composition be aligned substantially horizontally to the substrate. When the polymerizable composition is used for an overcoat layer, it is only necessary that a liquid crystalline compound having a larger number of polymerizable groups per molecule be thermally polymerized. When the polymerizable composition is used for an alignment film for liquid crystal mediums, it is preferable to use a polymerizable composition prepared by mixing an alignment material and a liquid crystalline compound having a polymerizable group. The polymerizable composition may be mixed into a liquid crystal medium, and the effect of improving various properties such as response speed, contrast, etc. is obtained by controlling the ratio of the liquid crystal medium and the liquid crystalline compound.
The polymerizable composition of the present invention can be used for an organic light-emitting display device. Specifically, the polymerizable composition is applied to a substrate or a substrate having the alignment function, aligned uniformly while the nematic phase or the smectic phase is maintained, and then polymerized. The retardation film obtained by the polymerization may be combined with a polarizing plate and used in the form of an antireflective film of the organic light-emitting display device. When the polymerizable composition is used for the antireflective film, it is preferable that the angle between the polarizing axis of the polarizing plate and the slow axis of the retardation film is about 45°. The polarizing plate and the retardation film may be laminated with an adhesive, a bonding agent, etc. The polymerizable composition may be directly deposited on a polarizing plate subjected to rubbing treatment or alignment treatment using a photo-alignment film stacked on the polarizing plate. The polarizing plate used in this case may be a film-shaped polarizing plate doped with a pigment or a metallic polarizing plate such as a wire grid.
A polymer obtained by aligning the polymerizable composition of the present invention having the nematic phase or the smectic phase on a substrate having the alignment function and then polymerizing the polymerizable composition can be used as a heat dissipation material for lighting devices, particularly light-emitting diode devices. The heat dissipation material is preferably in the form of a prepreg, a polymer sheet, an adhesive, a sheet with a metallic foil, etc.
The polymerizable composition of the present invention can be used for the optical component of the present invention. Specifically, the polymerizable composition is polymerized while the nematic phase or the smectic phase is maintained, or the polymerizable composition combined with an alignment material is polymerized.
By adding a coloring agent such as a dye or an organic pigment to the polymerizable composition of the present invention, the resulting polymerizable composition can be used as a coloring agent.
By combining the polymerizable composition of the present invention with a dichroic pigment, a lyotropic liquid crystal, a chromonic liquid crystal, etc. or adding the polymerizable composition thereto, the resulting polymerizable composition can be used for a polarizing film.
The present invention will next be described by way of Examples and Comparative Examples. However, the present invention is not limited thereto. “Parts” and “%” are based on mass, unless otherwise specified.
50 Parts of the compound represented by formula (1-a-6), 25 parts of the compound represented by formula (1-a-2), 25 parts of the compound represented by formula (2-a-1) with n=6, and 0.1 parts of p-methoxyphenol (MEHQ) were added to 400 parts of methyl ethyl ketone (MEK), heated to 60° C., and stirred to dissolve. After dissolution was complete, the mixture was returned to room temperature. Then 3 parts of IRGACURE 907 (Irg 907: manufactured by BASF Japan Ltd.) and 0.2 parts of MEGAFACE F-554 (F-554: manufactured by DIC Corporation) were added, and the resulting mixture was further stirred to thereby obtain a solution. The solution was clear and uniform. The solution obtained was filtered through a 0.20 μm membrane filter to thereby obtain a polymerizable composition (1) in Example 1.
Polymerizable compositions (2) to (51) in Examples 2 to 51 and polymerizable compositions (C1) to (C3) in Comparative Examples 1 to 3 were obtained under the same conditions as in the preparation of the polymerizable composition (1) in Example 1 except that ratios of compounds shown in tables below were changed as shown in the tables.
Specific compositions of the polymerizable compositions (1) to (51) in Examples 1 to 51 of the present invention and the polymerizable compositions (C1) to (C3) in Comparative Examples 1 to 3 are shown in Tables 1 to 6 below. Table 7 shows the SP value, the boiling point, and the evaporation rate index of each of the organic solvents used for the polymerizable compositions (1) to (51) and the polymerizable compositions (C1) to (C3) for comparison.
Chloroform (CLF)
N-Methylpyrrolidone (NMP)
Cyclopentanone (CPN)
Cyclohexanone (ANN)
Toluene (TOL)
Acetone (ACT)
Methyl ethyl ketone (MEK)
Ethyl acetate (EA)
Propylene glycol monomethyl ether acetate (PGMEA)
Methyl isobutyl ketone (MIBK)
The value of Re(450 nm)/Re(550 nm) of each of the compounds represented by the above formulas is shown in the following table.
The solubility in each of Examples 1 to 50 and Comparative Examples 1 to 5 was evaluated as follows.
A: After preparation, the clear and uniform state can be visually observed.
B: The clear and uniform state can be visually observed after heating and stirring, but precipitates of compounds are found when the mixture is returned to room temperature.
C: Compounds cannot be uniformly dissolved even after heating and stirring.
For each of Examples 1 to 50 and Comparative Examples 1 to 5, the state after the polymerizable composition was left to stand at room temperature for 1 week was visually checked. The storage stability of the polymerizable composition was evaluated as follows.
A: The clear and uniform state is maintained even after the polymerizable composition is left to stand at room temperature for 3 days.
B: The clear and uniform state is maintained even after the polymerizable composition is left to stand at room temperature for 1 day.
C: Precipitates of compounds are found after the polymerizable composition is left to stand at room temperature for 1 hour.
The results obtained are shown in the following tables.
A non-stretched 40 μm-thick cycloolefin polymer film “ZEONOR” (manufactured by ZEON CORPORATION) was subjected to rubbing treatment using a commercial rubbing device, and the polymerizable composition (1) of the present invention was applied by bar coating and dried at 80° C. for 2 minutes. The coating film obtained was cooled to room temperature and irradiated with UV rays at a conveying speed of 6 m/min using a UV conveyer device (manufactured by GS Yuasa Corporation) to thereby obtain an optically anisotropic body in Example 51 serving as a positive A-plate. The optically anisotropic body obtained was subjected to alignment evaluation, retardation ratio, and uneven application evaluation according to the following criteria.
AA: No defects are found at all by visual inspection, and no defects are found at all also by polarizing microscope observation.
A: No defects are found by visual inspection, but non-aligned portions are found in some parts by polarizing microscope observation.
B: No defects are found by visual inspection, but non-aligned portions are found over the entire region by polarizing microscope observation.
C: Defects are found in some parts by visual inspection, and non-aligned portions are found over the entire region by polarizing microscope observation.
The retardation of the optically anisotropic body produced above as an evaluation sample was measured using a retardation film-optical material inspection device RETS-100 (manufactured by Otsuka Electronics Co., Ltd.), and the in-plane retardation (Re(550)) at a wavelength of 550 nm was 121 nm. The ratio of the in-plane retardation (Re(450)) at a wavelength of 450 nm to Re(550), i.e., Re(450)/Re(550), was 0.807, and the retardation film obtained had high uniformity.
The degree of uneven application in the optically anisotropic body produced above as the evaluation sample was checked visually under crossed Nicols.
AA: No unevenness is found at all in the coating film.
A: Very slight unevenness is found in the coating film.
B: Slight unevenness is found in the coating film.
C: Obvious unevenness is found in the coating film.
Optically anisotropic bodies in Examples 52 to 68 and optically anisotropic bodies in Comparative Examples 1 to 3 each serving as a positive A-plate were obtained under the same conditions as in Example 51 except that the polymerizable composition used was changed to one of the polymerizable compositions (2) to (18) of the present invention and the polymerizable compositions (C1) to (C3) for comparison. The optically anisotropic bodies obtained were subjected to alignment evaluation, retardation ratio, and uneven alignment evaluation in the same manner as in Example 51.
The results obtained are shown in the following table.
A uniaxially stretched 50 μm-thick PET film was subjected to rubbing treatment using a commercial rubbing device, and the polymerizable composition (19) of the present invention was applied by bar coating and dried at 80° C. for 2 minutes. The coating film obtained was cooled to room temperature and irradiated with UV rays at a conveying speed of 6 m/min using a UV conveyer device (manufactured by GS Yuasa Corporation) to thereby obtain an optically anisotropic body in Example 69 serving as a positive A-plate. The optically anisotropic body obtained was subjected to alignment evaluation, retardation ratio, and uneven alignment evaluation in the same manner as in Example 51.
Optically anisotropic bodies in Examples 70 to 98 and Comparative Example 4 each serving as a positive A-plate were obtained under the same conditions as in Example 69 except that the polymerizable composition used was changed to one of the polymerizable compositions (20) to (48) of the present invention and the polymerizable composition (C4) for comparison. The optically anisotropic bodies obtained were subjected to alignment evaluation, retardation ratio, and uneven alignment evaluation in the same manner as in Example 51. The results obtained are shown in the following table.
5 Parts of a photo-alignment material represented by formula (12-4) below was dissolved in 95 parts of cyclopentanone to obtain a solution. The solution obtained was filtered through a 0.45 μm membrane filter to thereby obtain a photo-alignment solution (1). Next, the solution obtained was applied to a 0.7 mm-thick glass substrate by spin coating, dried at 80° C. for 2 minutes, and then irradiated with linearly polarized light of 313 nm at an intensity of 10 mW/cm2 for 20 seconds to thereby obtain a photo-alignment film (1). The polymerizable composition (49) was applied by spin coating to the photo-alignment film obtained and dried at 100° C. for 2 minutes. The coating film obtained was cooled to room temperature and irradiated with UV rays at an intensity of 30 mW/cm2 for 30 seconds using a high-pressure mercury lamp to thereby obtain an optically anisotropic body in Example 103. The optically anisotropic body obtained was subjected to alignment evaluation, retardation ratio, and uneven alignment evaluation in the same manner as in Example 51. The results of the alignment evaluation showed that no defects were found at all by visual inspection and that no defects were found at all also by polarizing microscope observation. The retardation of the optically anisotropic body obtained was measured using the RETS-100 (manufactured by Otsuka Electronics Co., Ltd.). The in-plane retardation (Re(550)) at a wavelength of 550 nm was 125 nm, and the retardation film obtained had high uniformity.
5 Parts of a photo-alignment material represented by formula (12-9) below was dissolved in 95 parts of N-methyl-2-pyrrolidone, and the solution obtained was filtered through a 0.45 μm membrane filter to thereby obtain a photo-alignment solution (2). Next, the solution obtained was applied to a 0.7 mm-thick glass substrate by spin coating, dried at 100° C. for 5 minutes, further dried at 130° C. for 10 minutes, and then irradiated with linearly polarized light of 313 nm at an intensity of 10 mW/cm2 for 1 minute to thereby obtain a photo-alignment film (2). The polymerizable composition (49) was applied by spin coating to the photo-alignment film obtained and dried at 100° C. for 2 minutes. The coating film obtained was cooled to room temperature and irradiated with UV rays at an intensity of 30 mW/cmz for 30 seconds using a high-pressure mercury lamp to thereby obtain an optically anisotropic body in Example 100. The optically anisotropic body obtained was subjected to alignment evaluation, retardation ratio, and uneven alignment evaluation in the same manner as in Example 51. The results of the alignment evaluation showed that no defects were found at all by visual inspection and that no defects were found at all also by polarizing microscope observation. The retardation of the optically anisotropic body obtained was measured using the RETS-100 (manufactured by Otsuka Electronics Co., Ltd.). The in-plane retardation (Re(550)) at a wavelength of 550 nm was 120 nm, and the retardation film obtained had high uniformity.
1 Part of a photo-alignment material represented by formula (12-8) above was dissolved in 50 parts of (2-ethoxyethoxy)ethanol and 49 parts of 2-butoxyethanol, and the solution obtained was filtered through a 0.45 μm membrane filter to thereby obtain a photo-alignment solution (3). Next, the solution obtained was applied to an 80 μm-thick polymethyl methacrylate (PMMA) film by bar coating, dried at 80° C. for 2 minutes, and irradiated with linearly polarized light of 365 nm at an intensity of 10 mW/cm2 for 50 seconds to thereby obtain a photo-alignment film (3). The polymerizable composition (49) was applied by spin coating to the photo-alignment film obtained and dried at 100° C. for 2 minutes. The coating film obtained was cooled to room temperature and irradiated with UV rays at an intensity of 30 mW/cm2 for 30 seconds using a high-pressure mercury lamp to thereby obtain an optically anisotropic body in Example 101. The optically anisotropic body obtained was subjected to alignment evaluation, retardation ratio, and uneven alignment evaluation in the same manner as in Example 51. The results of the alignment evaluation showed that no defects were found at all by visual inspection and that no defects were found at all also by polarizing microscope observation. The retardation of the optically anisotropic body obtained was measured using the RETS-100 (manufactured by Otsuka Electronics Co., Ltd.). The in-plane retardation (Re(550)) at a wavelength of 550 nm was 137 nm, and the retardation film obtained had high uniformity.
An optically anisotropic body in Comparative Example 5 was obtained under the same conditions as in Example 99 except that the polymerizable composition (C5) for comparison was used. An optically anisotropic body in Comparative Example 6 was obtained under the same conditions as in Example 100 except that the polymerizable composition (C5) for comparison was used. An optically anisotropic body in Comparative Example 7 was obtained under the same conditions as in Example 101 except that the polymerizable composition (C5) for comparison was used. The optically anisotropic bodies obtained were subjected to alignment evaluation, retardation ratio, and uneven alignment evaluation in the same manner as in Example 51. The results of the alignment evaluation showed that no defects were found by visual inspection, but non-aligned portions were found over the entire region by polarizing microscope observation. Each of the optically anisotropic bodies (5) to (7) for comparison was subjected to uneven application evaluation under crossed Nicols, and slight unevenness was found in the coating film.
A 180 μm-thick PET film was subjected to rubbing treatment using a commercial rubbing device, and the polymerizable composition (50) of the present invention was applied by bar coating and dried at 80° C. for 2 minutes. The coating film obtained was cooled to room temperature and irradiated with UV rays at a conveying speed of 5 m/min using a UV conveyer device (manufactured by GS Yuasa Corporation) with a lamp power of 2 kW to thereby obtain an optically anisotropic body. The optically anisotropic body obtained was subjected to alignment evaluation, retardation ratio, and uneven alignment evaluation in the same manner as in Example 51.
The retardation Re(550) of the optically anisotropic body obtained was 137 nm, and the ratio of the in-plane retardation (Re(450)) at a wavelength of 450 nm to Re(550), i.e., Re(450)/Re(550), was 0.871. The retardation film obtained had high uniformity. The degree of cissing in the optically anisotropic body (102) obtained was checked visually. No unevenness was found at all in the coating film.
Next, a 75 μm-thick polyvinyl alcohol film with an average polymerization degree of about 2,400 and a saponification degree of 99.9 mol % or more was uniaxially stretched by a factor of about 5.5 under dry conditions. While the stretched state was maintained, the film was immersed in pure water at 60° C. for 60 seconds and then immersed in an aqueous solution with an iodine/potassium iodide/water ratio of 0.05/5/100 by weight at 28° C. for 20 seconds. The resulting film was immersed in an aqueous solution with a potassium iodide/boric acid/water ratio of 8.5/8.5/100 by weight at 72° C. for 300 seconds. Then the resulting film was washed with pure water at 26° C. for 20 seconds and dried at 65° C. to thereby obtain a polarizing film in which iodine was adsorbed and aligned on the polyvinyl alcohol resin.
Saponified triacetylcellulose films (KC8UX2MW manufactured by Konica Minolta Opto Products Co., Ltd.) were applied to opposite surfaces of the thus-obtained polarizer through a polyvinyl alcohol-based adhesive prepared using 3 parts of carboxyl group-modified polyvinyl alcohol [KURARAY POVAL KL318 manufactured by KURARAY Co., Ltd.] and 1.5 parts of water-soluble polyamide epoxy resin [Sumirez Resin 650 (an aqueous solution with a solid content of 30%) manufactured by Sumika Chemtex Co., Ltd.] to protect the opposite surfaces, and a polarizing film was thereby produced.
The polarizing film obtained and the retardation film were laminated through an adhesive such that the angle between the polarizing axis of the polarizing film and the slow axis of the retardation film was 45° to thereby obtain an antireflective film of the present invention. The antireflective film obtained and an aluminum plate used as an alternative to an organic light-emitting element were laminated through an adhesive, and reflective visibility from the aluminum plate was visually checked from the front and at an oblique angle of 45°. No reflection from the aluminum plate was observed.
Polymerizable compositions (51) to (87) in Examples 103 to 139 were obtained under the same conditions as in the preparation of the polymerizable composition (1) in Example 1 except that ratios of compounds shown in tables below were changed as shown in the tables below.
Specific compositions of the polymerizable compositions (51) to (87) of the present invention are shown in the following tables.
The value of Re(450 nm)/Re(550 nm) of each of the compounds represented by the above formulas is shown in the following table.
The solubility in each of Examples 103 to 139 was evaluated as follows.
A: After preparation, the clear and uniform state can be visually observed.
B: The clear and uniform state can be visually observed after heating and stirring, but precipitates of compounds are found when the mixture is returned to room temperature.
C: Compounds cannot be uniformly dissolved even after heating and stirring.
For each of Examples 103 to 139, the state after the polymerizable composition was left to stand at room temperature for 1 week was visually checked. The storage stability was evaluated as follows.
A: The clear and uniform state is maintained even after the polymerizable composition is left to stand at room temperature for 3 days.
B: The clear and uniform state is maintained even after the polymerizable composition is left to stand at room temperature for 1 day.
C: Precipitates of compounds are found after the polymerizable composition is left to stand at room temperature for 1 hour.
The results obtained are shown in the following table.
A uniaxially stretched 50 μm-thick PET film was subjected to rubbing treatment using a commercial rubbing device, and the polymerizable composition (51) of the present invention was applied by bar coating and dried at 90° C. for 2 minutes. The coating film obtained was cooled to room temperature and irradiated with UV rays at a conveying speed of 6 m/min using a UV conveyer device (manufactured by GS Yuasa Corporation) to thereby obtain an optically anisotropic body in Example 140 serving as a positive A-plate. The optically anisotropic body obtained was subjected to alignment evaluation, retardation ratio, and uneven alignment evaluation in the same manner as in Example 51.
Optically anisotropic bodies in Examples 141 to 169 each serving as a positive A-plate were obtained under the same conditions as in Example 140 except that the polymerizable composition used was changed to one of the polymerizable compositions (52) to (80) of the present invention. The optically anisotropic bodies obtained were subjected to alignment evaluation, retardation ratio, and uneven application evaluation in the same manner as in Example 51. The results obtained are shown in the following table.
One of the polymerizable compositions (81) to (85) of the present invention was applied by bar coating to a film prepared by stacking a silane coupling agent-based vertical alignment film on a COP film substrate and then dried at 90° C. for 2 minutes. The coating films obtained were cooled to room temperature and irradiated with UV rays at a conveying speed of 6 m/min using a UV conveyer device (manufactured by GS Yuasa Corporation) to thereby obtain optically anisotropic bodies in Examples 170 to 174 each serving as a positive C-plate. The optically anisotropic bodies obtained were subjected to alignment evaluation, retardation ratio, and uneven application evaluation in the same manner as in Example 53. The results obtained are shown in the following table.
A uniaxially stretched 50 μm-thick PET film was subjected to rubbing treatment using a commercial rubbing device, and one of the polymerizable compositions (86) to (88) of the present invention was applied by bar coating to the PET film and dried at 90° C. for 2 minutes. The coating films obtained were cooled to room temperature and irradiated with UV rays at a conveying speed of 6 m/min using a UV conveyer device (manufactured by GS Yuasa Corporation) to thereby obtain optically anisotropic bodies in Examples 175 to 176 each serving as a positive O-plate. The optically anisotropic bodies obtained were subjected to alignment evaluation, retardation ratio, and uneven application evaluation in the same manner as in Example 53. The results obtained are shown in the following table.
10 Parts of the compound represented by formula (1-a-2), 10 parts of the compound represented by formula (1-a-5), 55 parts of the compound represented by formula (1-a-6), 7 parts of the compound represented by formula (2-a-1) with n=6, 10 parts of the compound represented by formula (2-b-1) with m=n=3, 8 parts of the compound represented by formula (2-b-1) with m=n=4, and 6 parts of the compound represented by formula (10-10) below were added to 200 parts of methyl ethyl ketone and 200 parts of methyl isobutyl ketone, heated to 60° C., and dispersed and dissolved under stirring. After dispersion and dissolution was complete, the mixture was returned to room temperature. Then 3 parts of IRGACURE 907 (manufactured by BASF Japan Ltd.), 0.05 parts of MEGAFACE F-554 (manufactured by DIC Corporation), 0.2 parts of polypropylene with a weight average molecular weight of 1,200, 0.1 parts of p-methoxyphenol, and 0.1 parts of IRGANOX 1076 (manufactured by BASF Japan Ltd.) were added, and the resulting mixture was further stirred to thereby obtain a solution. The solution was clear and uniform. The solution obtained was filtered through a 0.20 μm membrane filter to thereby obtain a polymerizable composition (88) of the present invention.
Polymerizable compositions (89) to (90) in Examples 178 to 179 were obtained under the same conditions as in the preparation of the polymerizable composition (88) in Example 177 except that ratios of compounds shown in a table below were changed as shown in the table.
Specific compositions of the polymerizable compositions (88) to (90) of the present invention are shown in the following table.
Polypropylene (PP) (weight average molecular weight: 1,200)
A uniaxially stretched 180 μm-thick PET film was subjected to rubbing treatment using a commercial rubbing device, and the polymerizable composition (88) of the present invention was applied by bar coating and dried at 80° C. for 2 minutes. The coating film obtained was cooled to room temperature and irradiated with UV rays at a conveying speed of 4 m/min using a UV conveyer device (manufactured by GS Yuasa Corporation) with a lamp power of 2 kW (80 W/cm) to thereby obtain an optically anisotropic body in Example 180 serving as a negative C-plate. The alignment of the optically anisotropic body obtained was evaluated. No defects were found at all by visual inspection, and no defects were found at all also by polarizing microscope observation. The optically anisotropic body obtained assumed a green color and was found to be a reflective film.
An optically anisotropic body in Example 181 was obtained under the same conditions as in Example 180 except that the polymerizable composition used was changed to the polymerizable composition (89) of the present invention. The alignment of the optically anisotropic body obtained was evaluated. No defects were found at all by visual inspection, and no defects were found at all also by polarizing microscope observation. The optically anisotropic body obtained was clear, and the transmittance of the optically anisotropic body was measured using a spectrophotometer (manufactured by Hitachi High-Tech Science Corporation). A region with reduced transmittance was observed in the infrared region, and the optically anisotropic body was found to be an infrared reflective film. The retardation of the optically anisotropic body was measured using the RETS-100 at different light incident angles from −50° to 50° in 10° steps, and an out-of-plane retardation (Rth) at a wavelength of 550 nm was computed from the retardations obtained. The out-of-plane retardation was 130 nm, and the optically anisotropic body was found to be a negative C-plate.
An optically anisotropic body in Example 182 was obtained under the same conditions as in Example 180 except that the polymerizable composition used was changed to the polymerizable composition (90) of the present invention. The alignment of the optically anisotropic body obtained was evaluated. No defects were found at all by visual inspection, and no defects were found at all also by polarizing microscope observation. The optically anisotropic body obtained was clear, and the transmittance of the optically anisotropic body was measured using a spectrophotometer (manufactured by Hitachi High-Tech Science Corporation). A region with reduced transmittance was observed in the ultraviolet region, and the optically anisotropic body was found to be an ultraviolet reflective film. The retardation of the optically anisotropic body was measured using the RETS-100 at different light incident angles from −50° to 50° in 10° steps, and an out-of-plane retardation (Rth) at a wavelength of 550 nm was computed from the retardations obtained. The out-of-plane retardation was 132 nm, and the optically anisotropic body was found to be a negative C-plate.
30 parts of the compound represented by formula (1-a-5), 30 parts of the compound represented by formula (1-a-6), 40 parts of the compound represented by formula (2-a-42) with n=6, and 1 part of the compound represented by formula (12-9) were added to 400 parts of cyclopentanone, heated to 40° C., and dissolved under stirring. After dissolution was complete, the mixture was returned to room temperature. Then 3 parts of IRGACURE 907 (manufactured by BASF Japan Ltd.), 0.1 parts of MEGAFACE F-554 (manufactured by DIC Corporation), and 0.1 parts of p-methoxyphenol were added, and the resulting mixture was further stirred to thereby obtain a solution. The solution was clear and uniform. The solution obtained was filtered through a 0.20 μm membrane filter to thereby obtain a polymerizable composition (91) of the present invention.
Polymerizable compositions (92) to (93) in Examples 184 to 185 were obtained under the same conditions as in the preparation of the polymerizable composition (91) in Example 183 except that ratios of compounds shown in a table below were changed as shown in the table.
Specific compositions of the polymerizable compositions (91) to (93) of the present invention are shown in the following table.
The polymerizable composition (91) of the present invention was applied to a 0.7 mm-thick glass substrate by spin coating, dried at 70° C. for 2 minutes, further dried at 100° C. for 2 minutes, and irradiated with linearly polarized light of 313 nm at an intensity of 10 mW/cm2 for 30 seconds. Then the coating film was returned to room temperature and irradiated with UV rays at an intensity of 30 mW/cm2 for 30 seconds using a high-pressure mercury lamp to thereby obtain an optically anisotropic body in Example 186 serving as a positive A-plate. The alignment of the optically anisotropic body obtained was evaluated. No defects were found at all by visual inspection, and no defects were found at all also by polarizing microscope observation. The retardation of the optically anisotropic body obtained was measured using the RETS-100 (manufactured by Otsuka Electronics Co., Ltd.). The in-plane retardation (Re(550)) at a wavelength of 550 nm was 137 nm, and the retardation film obtained had high uniformity.
The polymerizable composition (92) of the present invention was applied to a 0.7 mm-thick glass substrate by spin coating, dried at 60° C. for 2 minutes, further dried at 110° C. for 2 minutes, returned to 60° C., and irradiated with linearly polarized light of 313 nm at an intensity of 10 mW/cm2 for 50 seconds. Then the coating film was returned to room temperature and irradiated with UV rays at an intensity of 30 mW/cm2 for 30 seconds using a high-pressure mercury lamp to thereby obtain an optically anisotropic body in Example 187 serving as a positive A-plate. The alignment of the optically anisotropic body obtained was evaluated. No defects were found at all by visual inspection, and no defects were found at all also by polarizing microscope observation. The retardation of the optically anisotropic body obtained was measured using the RETS-100 (manufactured by Otsuka Electronics Co., Ltd.). The in-plane retardation (Re(550)) at a wavelength of 550 nm was 130 nm, and the retardation film obtained had high uniformity.
The polymerizable composition (93) of the present invention was applied to a 0.7 mm-thick glass substrate by spin coating, dried at 60° C. for 2 minutes, further dried at 110° C. for 2 minutes, returned to 60° C., and irradiated with linearly polarized light of 313 nm at an intensity of 10 mW/cm2 for 100 seconds. Then the coating film was returned to room temperature and irradiated with UV rays at an intensity of 30 mW/cm2 for 30 seconds using a high-pressure mercury lamp to thereby obtain an optically anisotropic body in Example 188. The alignment of the optically anisotropic body obtained was evaluated. No defects were found at all by visual inspection, and no defects were found at all also by polarizing microscope observation. The retardation of the optically anisotropic body obtained was measured using the RETS-100 (manufactured by Otsuka Electronics Co., Ltd.). The in-plane retardation (Re(550)) at a wavelength of 550 nm was 108 nm, and the retardation film obtained had high uniformity.
20 Parts of the compound represented by formula (1-a-5), 20 parts of the compound represented by formula (1-a-6), 10 parts of the compound represented by formula (2-a-1) with n=6, 10 parts of the compound represented by formula (2-a-1) with n=3, 10 parts of the compound represented by formula (2-b-1) with m=n=3, and 6 parts of the compound represented by formula (d-7) were added to 400 parts of cyclopentanone, heated to 60° C., and dispersed and dissolved under stirring. After dispersion and dissolution was complete, the mixture was returned to room temperature. Then 3 parts of IRGACURE OXE-01 (Irg. OXE-01 manufactured by BASF Japan Ltd.), 0.20 parts of MEGAFACE F-554 (manufactured by DIC Corporation), 0.1 parts of p-methoxyphenol (MEHQ), 0.1 parts of IRGANOX 1076 (manufactured by BASF Japan Ltd.), and 2 parts of trimethylolpropane tris(3-mercaptopropionate) TMMP (manufactured by SC Organic Chemical Co., Ltd.) were added, and the resulting mixture was further stirred to thereby obtain a solution. The solution was uniform. The solution obtained was filtered through a 0.5 μm membrane filter to thereby obtain a polymerizable composition (94) of the present invention. The solubility in Example 189 was evaluated in the same manner as in Example 1, and the clear and uniform state was found. The storage stability was evaluated in the same manner as in Example 1. The clear and uniform state was maintained even after the polymerizable composition was left to stand at room temperature for 3 days.
A polymerizable composition (95) in Example 190 was obtained under the same condition as in the preparation of the polymerizable composition (94) in Example 189 except that the ratios of compounds shown in a table below were changed as shown in the table.
Specific compositions of the polymerizable compositions (94) to (95) of the present invention are shown in the following table.
Trimethylolpropane tris(3-mercaptopropionate) (TMMP)
The results obtained are shown in the following table.
A polyimide solution for an alignment film was applied to a 0.7 mm-thick glass substrate by spin coating, dried at 100° C. for 10 minutes, and then fired at 200° C. for 60 minutes to obtain a coating film. The coating film obtained was subjected to rubbing treatment. The rubbing treatment was performed using a commercial rubbing device.
The polymerizable composition (94) of the present invention was applied by spin coating to the substrate subjected to rubbing and dried at 90° C. for 2 minutes. The coating film obtained was cooled to room temperature over 2 minutes and irradiated with UV rays at an intensity of 30 mW/cm2 for 30 seconds using a high-pressure mercury lamp to thereby obtain an optically anisotropic body in Example 191 serving as a positive A-plate. No uneven application was observed in the optically anisotropic body obtained. The degree of polarization, transmittance, and contrast of the optically anisotropic body obtained were measured using the RETS-100 (manufactured by Otsuka Electronics Co., Ltd.). The degree of polarization was 99.0%, the transmittance was 44.5%, and the contrast was 93. The optically anisotropic body was found to function as a polarizing film.
An optically anisotropic body in Example 192 serving as a positive A-plate was obtained under the same conditions as in Example 191 except that the polymerizable composition used was changed to the polymerizable composition (95) of the present invention. No uneven application was observed in the optically anisotropic body obtained. The degree of polarization, transmittance, and contrast of the optically anisotropic body obtained were measured using the RETS-100 (manufactured by Otsuka Electronics Co., Ltd.). The degree of polarization was 98.5%, the transmittance was 44.3%, and the contrast was 91. The optically anisotropic body was found to function as a polarizing film.
As shown in the above Examples, the polymerizable compositions of the present invention that use the organic solvents satisfying the solubility parameter (SP value), the boiling point, and the evaporation rate index specified in the present invention are excellent in solubility and storage properties. In the optically anisotropic bodies of the present invention that are formed from the polymerizable liquid crystal compositions (1) to (95) (Examples 51 to 102, 140 to 176, 180 to 182, 186 to 188, and 191 to 192), the results of all the alignment evaluation and the uneven application evaluation are good, and their productivity is high. In particular, in the polymerizable liquid crystal compositions that use methyl ethyl ketone and cyclopentanone as solvents, the results of the alignment evaluation and the uneven application evaluation are very good. As can be seen from the results in Comparative Examples 1 to 7, when organic solvents that do not satisfy the solubility parameter (SP value), the boiling point, and the evaporation rate index specified in the present invention are used, the results of any of the alignment evaluation and the uneven application evaluation are not good, and the results are poorer than those of the polymerizable liquid crystal compositions of the present invention.
| Number | Date | Country | Kind |
|---|---|---|---|
| 2015-006300 | Jan 2015 | JP | national |
| Filing Document | Filing Date | Country | Kind |
|---|---|---|---|
| PCT/JP2016/050984 | 1/14/2016 | WO | 00 |
