Patent Application
20200122496
This application claims the benefit of priority to Taiwan Patent Application No. 107136855, filed on Oct. 19, 2018. The entire content of the above identified application is incorporated herein by reference.
Some references, which may include patents, patent applications and various publications, may be cited and discussed in the description of this disclosure. The citation and/or discussion of such references is provided merely to clarify the description of the present disclosure and is not an admission that any such reference is “prior art” to the disclosure described herein. All references cited and discussed in this specification are incorporated herein by reference in their entireties and to the same extent as if each reference was individually incorporated by reference.
The present disclosure relates to a PET synthetic paper, and more particularly to a PET synthetic paper for traditional lithography, digital printing and inkjet printing.
Conventional natural wood pulp paper and polyolefin synthetic paper can be used in traditional lithography, digital printing and inkjet printing. However, the tactilities of those kinds of papers are rough and lack softness.
In order to increase the popularity and usage of polyolefin synthetic paper, it has become an important issue in the field of synthetic paper to develop a synthetic paper with good softness, good elasticity, good printing performance, good ink adhesion and good water resistance.
In response to the above-referenced technical inadequacies, the present disclosure provides a PET synthetic paper with velvety-soft tactility, low gloss and excellent printability.
In one aspect, the present disclosure provides a PET synthetic paper consisting of a PET substrate and a soft ink absorbing coating coated on the PET substrate and having a thickness of 4 to 24 μm. The soft ink absorbing coating includes an acrylic coating and a polyurethane coating embossed on the acrylic coating and being island-shaped, and based on the total weight of the soft ink absorbing coating, the composition of the soft ink absorbing coating includes the following components and the total of each of the components is 100 wt %:
(1) 2-40 wt % of polyurethane resins, wherein the polyurethane resin is an elastomer and the main chain of the elastomer is a polymer formed of polyisocyanates and polyols;
(2) 2-40 wt % of acrylic resin monomers;
(3) 0.5-30 wt % of crosslinking agents, which is selected from one or any combination of an isocyanate crosslinking agent, an aziridine crosslinking agent, an oxazoline crosslinking agent and a carbodiimide crosslinking agent;
(4) 0.05-30 wt % of surface modified filled particles;
(5) 0.5-30 wt % of blowing agents selected from an N-nitroso compound, an azo compound and a hydrazide compound;
(6) 0.05-10 wt % of additives selected from one or any combination of an auxiliary, a catalyst and a cosolvent; and
(7) 50-85 wt % of aqueous solvents.
Therefore, the PET synthetic paper of the present disclosure provides velvety-soft tactility, low gloss and excellent printability so that the acceptance and use rate of synthetic paper can be enhanced.
These and other aspects of the present disclosure will become apparent from the following description of the embodiment taken in conjunction with the following drawings and their captions, although variations and modifications therein may be affected without departing from the spirit and scope of the novel concepts of the disclosure.
The present disclosure will become more fully understood from the following detailed description and accompanying drawings.
The present disclosure is more particularly described in the following examples that are intended as illustrative only since numerous modifications and variations therein will be apparent to those skilled in the art. Like numbers in the drawings indicate like components throughout the views. As used in the description herein and throughout the claims that follow, unless the context clearly dictates otherwise, the meaning of “a”, “an”, and “the” includes plural reference, and the meaning of “in” includes “in” and “on”. Titles or subtitles can be used herein for the convenience of a reader, which shall have no influence on the scope of the present disclosure.
The terms used herein generally have their ordinary meanings in the art. In the case of conflict, the present document, including any definitions given herein, will prevail. The same thing can be expressed in more than one way. Alternative language and synonyms can be used for any term(s) discussed herein, and no special significance is to be placed upon whether a term is elaborated or discussed herein. A recital of one or more synonyms does not exclude the use of other synonyms. The use of examples anywhere in this specification including examples of any terms is illustrative only, and in no way limits the scope and meaning of the present disclosure or of any exemplified term. Likewise, the present disclosure is not limited to various embodiments given herein. Numbering terms such as “first”, “second” or “third” can be used to describe various components, signals or the like, which are for distinguishing one component/signal from another one only, and are not intended to, nor should be construed to impose any substantive limitations on the components, signals or the like.
As shown in
With the polyurethane coating 18 of the soft ink absorbing coating 15, the PET synthetic paper 10 of the present disclosure has characteristics of velvety-soft tactility and low gloss, and with the acrylic coating 16 of the soft ink absorbing coating 15, the PET synthetic paper 10 of the present disclosure can be used in traditional lithography, digital printing and inkjet printing.
The soft ink absorbing coating 15 is a water-soluble coating fluid including the following components based on the total weight of the coating fluid, and the total of each of the components is 100 wt %:
(1) 2-40 wt % of polyurethane resins;
(2) 2-40 wt % of acrylic resin monomers;
(3) 0.5-30 wt % of crosslinking agents;
(4) 0.05-30 wt % of surface modified filled particles;
(5) 0.5-30 wt % of blowing agents;
(6) 0.05-10 wt % of additives; and
(7) 50-85 wt % of aqueous solvents.
The polyurethane resin of the present disclosure is an elastomer and a main chain thereof is a linear polymer formed of polyisocyanates and polyols, and then extended with ethylenediamine to obtain a “soft segment” nonionic group with polyether or polyester. The side chain thereof has an anionic group containing a sulfonic acid group and a nonionic group.
The polyisocyanate is selected from toluene diisocyanate (TDI), isophorone diisocyanate (IPDI), methylenediphenyl diisocyanate (MDI), dicyclohexylmethane diisocyanate (HMDI), lysine diisocyanate (LDI), p-phenylene diisocyanate (PPDI), naphthalene diisocyanate (NDI), dimethyl biphenyl diisocyanate (TODI), cyclohexane diisocyanate (CHDI), tetramethylxylylene diisocyanate (TMXDI), and 1,3-bis(isocyanatomethyl)cyclohexane (H6XDI).
The polyol may be a polyester polyol and a polyether polyol. The polyester polyol is obtained by condensation of a low molecular weight diols and a dicarboxylic acid, for example: a condensed polyester polyol obtained by condensation of a low molecular polyol such as ethylene glycol, 1,3-propanediol, 1,4-butanediol, 1,6-hexanediol with an aliphatic dicarboxylic acid such as succinic acid, glutaric acid, adipic acid, pimelic acid, suberic acid, azelic acid, sebacic acid, decanedicarboxylic acid, and cyclohexanedicarboxylic acid, and also, a cyclic ester such as ε-caprolactone and a polyester polyol such as hexamethylenediamine or isophorone diamine by the reaction of a part of diol. The polyols mentioned above may be used in single or in plurality, and copolymers thereof can also be used.
The polyether polyol is selected from one or any combination of polytetramethylene ether glycol (PTMEG), polypropylene glycol (PPG), and a polyether compound with a main chain and a side chain of polyethylene glycol (PEG).
The acrylic resin monomer is selected from one or any combination of methyl (meth)acrylate (MMA), ethyl acrylate (EA), propyl (meth)acrylate (PA), butyl acrylate (BA), isobutyl (meth)acrylate (IBA), amyl (meth)acrylate, hexyl (meth)acrylate, heptyl (meth)acrylate, octyl (meth)acrylate, 2-ethylhexyl (meth)acrylate (2-HEA), n-octyl (meth)acrylate (OA), isooctyl (meth)acrylate (IOA), nonyl (meth)acrylate (NA), decyl (meth)acrylate, lauryl acrylate (LA), octadecyl (meth)acrylate, methoxyethyl (meth)acrylate (MOEA), n-butyl methacrylate (n-BMA), 2-ethylhexyl acrylate (2-EHA) and ethoxymethyl (meth)acrylate (EOMAA) as a coating resin shaped like the water surrounding islands.
The crosslinking agent is at least one selected from the group consisting of melamine, a hydroxymethyl modified melamine derivative in which melamine is condensed with formaldehyde, an isocyanate crosslinking agent, an aziridine crosslinking agent, an oxazoline crosslinking agent and a carbodiimide crosslinking agent. In the present disclosure, the crosslinking agent is preferably used in an amount of 0.5 to 30 wt %, more preferably 1 to 20 wt %.
The filled particle is selected from one or any combination of silicon oxide, titanium oxide, aluminum oxide, aluminum hydroxide, calcium carbonate, calcium phosphate and barium sulfate, and has a particle diameter of 0.005 to 10 μm. The filled particles having different particle diameters can also be chosen according to different physical requirements such as transparency, haze, slipperiness, and anti-adhesiveness. When the filled particle has a larger particle diameter, the anti-adhesiveness at a high temperature has a better effect. When the dispersibility of the filled particle is better, the filled particle is less likely to be agglomerated and the PET synthetic paper of the present disclosure has lower haze.
The filled particle of the present disclosure is surface-modified by using a surface modification treatment agent. The surface modification treatment agent is selected from one or any combination of a vinylsilane coupling agent, an epoxy silane coupling agent, a styrene silane coupling agent, a methacryloyloxy silane coupling agent, an acryloxy silane coupling agent, an aminosilane coupling agent, an isocyanurate silane coupling agent, a urea silane coupling agent and an isocyanate silane coupling agent. Inorganic particles modified by the surface modification treatment agent have better dispersibility, compatibility, and adhesion. In the present disclosure, the surface modification treatment agent is preferably used in an amount of 0.5 to 30 wt %, more preferably 5 to 20 wt %.
The additive is selected from one or any combination of an auxiliary, a catalyst and a cosolvent. The auxiliary is used to adjust the surface tension of the water-soluble coating fluid, and improve the wettability of the coating and substrate formed of the water-soluble coating fluid and the evenness or smoothness of the coating. The catalyst is used to control the reaction rate of a coating bridge. The cosolvent is used to control the evaporation rate of fluid components.
The auxiliary includes an auxiliary containing silicon, fluorine or silicon/fluorine-containing. The silicon-containing auxiliary may be selected from one or more of BYK307, BYK325, BYK331, BYK380N and BYK381 of BYK. The fluorine-containing auxiliary may be selected from one or more of FC-4430 and FC-4432 of 3M, Zonyl FSN-100 of DuPont USA, and DSX of Daikin Industries, Ltd. The silicon/fluorine-containing auxiliary may be selected from one or more of BYK346, BYK347 and BYK348.
The catalyst is an inorganic substance, a salt, an organic substance, an alkaline substance, an acidic substance, or the like. The cosolvent is methanol, ethanol, n-propanol, isopropanol, butanol, isobutanol, dimethyl sulfoxide, acetone or tetrahydrofuran.
As shown in
After the coating, the soft ink absorbing coating 15 is dried at 120° C., and the polyurethane resin of the soft ink absorbing coating 15 is foamed by the blowing agent to generate micropores and form the convex polyurethane coating 18. Accordingly, the surface of the PET synthetic paper 10 of the present disclosure provides velvety-soft tactility and has a well coated appearance.
At 120° C., the acrylic resin of the soft ink absorbing coating 15 generates micropores by the blowing agent and forms the even acrylic coating 16 so as to increase ink absorption performance during printing. Accordingly, the PET synthetic paper 10 of the present disclosure can be used in traditional lithography, digital printing and inkjet printing.
The addition of the surface modified filled particle to the soft ink absorbing coating 15 increases the ink absorbing ability and the surface friction of the PET synthetic paper 10 of the present disclosure, and prevents the PET synthetic paper 10 from paper jam or scratches on the surface thereof.
Moreover, the additive can improve the coating of the soft ink absorbing coating 15 so that the soft ink absorbing coating has a uniform coating and an intact appearance.
The following embodiments are given to illustrate the contents of the present disclosure and the effects which can be achieved, but the present disclosure is not limited to the embodiments. The physical properties of the embodiments are evaluated in terms of the following aspects:
According to the formula in Table 1, the water-soluble coating fluid used to form a soft ink absorbing coating includes 20 g of a polyurethane resin, 8 g of an acrylic resin, 1.0 g of a melamine crosslinking agent, 0.5 g of an oxazoline crosslinking agent, 0.1 g of an anionic surfactant A, 0.25 g of a nonionic surfactant B, 0.1 g of a silicon-containing compound as the surface modification treatment agent, 1.2 g of the blowing agent, 1.6 g of silicon oxide particles A having a particle diameter of 2 μm, 3.6 g of silicon oxide particles B having a particle diameter of 0.1 μm, 62.32 g of water, 0.1 g of a catalyst, and 1.2 g of butyl cellulose and 0.03 g of silicon or fluorine-containing auxiliary. After being stirred uniformly, the water-soluble coating fluid is uniformly coated on a PET substrate up to 10 μm, and the coated PET substrate is introduced into a heating zone of 120° C. to remove the moisture of the water-soluble coating fluid (or the coating layer) and foam the polyurethane resin in the coating layer to be micropores so as to become a convex polyurethane coating. Accordingly, the PET synthetic paper is manufactured and the physical properties thereof are measured as shown in Table 1.
According to the formula in Table 1, the water-soluble coating fluid used to form the soft ink absorbing coating is prepared. Compared with the formula of Embodiment 1, in Embodiment 2, the amount of silicon-containing compound is reduced from 0.1 g to 0.05 g, the amount of silicon oxide particles A is increased from 1.6 to 2.1 g, and the amount of silicon oxide particles B is reduced from 3.6 to 2.5 g. The physical properties of the manufactured PET synthetic paper are shown in
According to the formula in Table 1, the water-soluble coating fluid used to form the soft ink absorbing coating is prepared. Compared with the formula of Embodiment 1, in Embodiment 3, the amounts of resin, surface modification treatment agent, filled particles, and additive are doubled. The water-soluble coating fluid includes 40 g of the polyurethane resin, 16 g of the acrylic resin, 1.5 g of the melamine crosslinking agent, 1.2 g of the oxazoline crosslinking agent, 0.2 g of the anionic surfactant A, 0.5 g of the nonionic surfactant B, 25.24 g of water, 0.2 g of the catalyst, and 2.4 g of butyl cellulose and 0.06 g of the silicon or fluorine-containing auxiliary. After being stirred uniformly, the water-soluble coating fluid is uniformly coated on the PET substrate up to 10 μm, and the coated PET substrate is introduced into the heating zone of 120° C. to remove the moisture of the water-soluble coating fluid (or the coating layer) and foam the polyurethane resin in the coating layer to be micropores so as to become the convex polyurethane coating. Accordingly, the PET synthetic paper is manufactured and the physical properties thereof are measured as shown in Table 1.
According to the formula in Table 1, the water-soluble coating fluid used to form the soft ink absorbing coating is prepared. Compared with the formula of Embodiment 1, in Embodiment 4, the amounts of resin, surface modification treatment agent, filled particles, and additive are reduced to a half. The water-soluble coating fluid includes 10 g of the polyurethane resin, 4 g of the acrylic resin, 0.5 g of the melamine crosslinking agent, 0.25 g of the oxazoline crosslinking agent, 0.05 g of the anionic surfactant A, 0.1 g of the nonionic surfactant B, 0.1 g of the silicon-containing compound as the surface modification treatment agent, 0.6 g of the blowing agent, 0.8 g of silicon oxide particles A having a particle diameter of 2 μm, 2.0 g of silicon oxide particles B having a particle diameter of 0.1 μm, 80.89 g of water, 0.1 g of the catalyst, 0.6 g of butyl cellulose and 0.01 g of the silicon or fluorine-containing auxiliary. After being stirred uniformly, the water-soluble coating fluid is uniformly coated on the PET substrate up to 10 μm, and the coated PET substrate is introduced into the heating zone of 120° C. to remove the moisture of the water-soluble coating fluid (or the coating layer) and foam the polyurethane resin in the coating layer to be micropores so as to become the convex polyurethane coating. Accordingly, the PET synthetic paper is manufactured and the physical properties thereof are measured as shown in Table 1.
According to the formula in Table 1, the water-soluble coating fluid used to form the soft ink absorbing coating is prepared. Compared with the formula of Embodiment 1, in Comparative example 1, the crosslinking agent is not used, and the amount of water is 62.17. The physical properties of the manufactured PET synthetic paper are shown in
According to the formula in Table 1, the water-soluble coating fluid used to form the soft ink absorbing coating is prepared. Compared with the formula of Embodiment 1, in Embodiment 4, the blowing agent is not used and the amount of crosslinking agent is increased. The water-soluble coating fluid includes 20 g of the polyurethane resin, 8 g of the acrylic resin, 5.0 g of the melamine crosslinking agent, 3.0 g of the oxazoline crosslinking agent, 0.1 g of the anionic surfactant A, 0.25 g of the nonionic surfactant B, 0.1 g of the silicon-containing compound as the surface modification treatment agent, 1.6 g of silicon oxide particles A having a particle diameter of 2 μm, 3.6 g of silicon oxide particles B having a particle diameter of 0.1 μm, 62.32 g of water, 0.1 g of the catalyst, 1.2 g of butyl cellulose and 0.03 g of the silicon or fluorine-containing auxiliary. After being stirred uniformly, the water-soluble coating fluid is uniformly coated on the PET substrate up to 10 μm, and the coated PET substrate is introduced into the heating zone of 120° C. to remove the moisture of the water-soluble coating fluid (or the coating layer) and foam the polyurethane resin in the coating layer to be micropores so as to become the convex polyurethane coating. Accordingly, the PET synthetic paper is manufactured and the physical properties thereof are measured as shown in Table 1.
According to the formula in Table 1, the water-soluble coating fluid used to form the soft ink absorbing coating is prepared. Compared with the formula of Embodiment 1, in Comparative example 3, the surface modification treatment agent is not used. The physical properties of the manufactured PET synthetic paper are shown in
According to the formula in Table 1, the water-soluble coating fluid used to form the soft ink absorbing coating is prepared. Compared with the formula of Embodiment 1, in Comparative example 4, the filled particle is not used. The physical properties of the manufactured PET synthetic paper are shown in
In conclusion:
The foregoing description of the exemplary embodiments of the disclosure has been presented only for the purposes of illustration and description and is not intended to be exhaustive or to limit the disclosure to the precise forms disclosed. Many modifications and variations are possible in light of the above teaching.
The embodiments were chosen and described in order to explain the principles of the disclosure and their practical application so as to enable others skilled in the art to utilize the disclosure and various embodiments and with various modifications as are suited to the particular use contemplated. Alternative embodiments will become apparent to those skilled in the art to which the present disclosure pertains without departing from its spirit and scope.
| Number | Date | Country | Kind |
|---|---|---|---|
| 107136855 | Oct 2018 | TW | national |
