Patent Grant
10843422
The present invention generally relates to a method for producing naturally wettable silicone hydrogel contact lenses with a robustness of lens shape.
Silicone hydrogel (SiHy) contact lenses, which are made of a hydrated, crosslinked polymeric material that contains silicone and a certain amount of water within the lens polymer matrix at equilibrium, are increasingly becoming popular, because they have minimal adverse effects on corneal health due to their relatively high oxygen permeability. But, incorporation of silicone in a contact lens material can have undesirable effects on the hydrophilicity and wettability of SiHy contact lenses, because silicon is hydrophobic and has a great tendency to migrate onto the lens surface being exposed to air. Contact lenses manufacturers have made a great effort in developing SiHy contact lenses having a hydrophilic and wettable surface.
One interesting approach for rending SiHy contact lenses wettable without post curing surface treatment is the incorporation of monomeric wetting agents (e.g., N-vinylpyrrolidone, N-vinyl-N-methyl acetamide, or the like) in a lens formulation for making SiHy contact lens as proposed in U.S. Pat. Nos. 6,867,245, 7,268,198, 7,540,609, 7,572,841, 7,750,079, 7,934,830, 8,231,218, 8,367,746, 8,445,614, 8,481,662, 8,487,058, 8,513,325, 8,703,891, 8,820,928, 8,865,789, 8,937,110, 8,937,111, 9,057,821, 9,057,822, 9,121,998, 9,125,808, 9,140,825, 9,140,908, 9,156,934, 9,164,298, 9,170,349, 9,188,702, 9,217,813, 9,296,159, 9,322,959, 9,322,960, 9,360,594, 9,529,119. Although this approach may provide fresh (unused) SiHy lenses with adequately hydrophilic surfaces, there are some limitations. For example, the higher oxygen permeability of a SiHy contact lens could be achieved according to this approach, but at the expense of its equilibrium water content and atomic Si percentage at lens surface. Typically, relatively-lower equilibrium water content and relatively-higher atomic Si percentage go with higher oxygen permeability in tandem. Further, it may also have one or more of the following disadvantages: slightly-high haziness; a relatively-higher surface silicone content; susceptibility to form dry spots and/or hydrophobic surface areas created due to air exposure, drying-rehydrating cycles, shearing forces of the eyelids, silicone migration, and/or partial failure to prevent silicone from exposure; and not-adequate lubricity.
The invention is related to a method for producing naturally wettable silicone hydrogel contact lenses with a robusteness of lens shape. The method comprises the steps of: preparing a polymerizable composition which is clear at room temperature and optionally but preferably at a temperature of from about 0 to about 4° C., wherein the polymerizable composition comprises (a) at least one siloxane-containing vinylic monomer including 0 to 10 first H-donor moieties, (b) at least one first polysiloxane vinylic crosslinker which has a number average molecular weight of from about 3000 Daltons to about 80,000 Daltons and comprises (i) two terminal (meth)acryloyl groups, (ii) at least one polysiloxane segment comprising dimethylsiloxane units and hydrophilized siloxane units each having one methyl substituent and one monovalent C4-C40 organic radical substituent having one or more second H-donor moieties, and (iii) from 0 to 20 third H-donor moieties which are integral parts of molecular structures outside of the polysiloxane segment, (c) at least one hydrophilic N-vinyl amide monomer, (d) a C1-C4 alkyl (meth)acrylate in an amount for increasing the robusteness of lens shape of silicone hydrogel contact lenses produced from the polymerizable composition relative to a control polymerizable composition free of C1-C4 alkyl (meth)acrylate, (e) optionally at least one second polysiloxane vinylic crosslinker having 0 to 35 fourth H-donor moieties, and (f) at least one free radical initiator, wherein the first and second polysiloxane vinylic crosslinker are different from each other, wherein the first, second, third and fourth H-donor moieties independent of one another are hydroxyl groups, carboxyl groups, amino groups of —NHRo, amino linkages of —NH—, amide linkages of —CONH—, urethane linkages of —OCONH—, or combinations thereof, wherein Ro is H or a C1-C4 alkyl, wherein the polymerizable composition comprises at least 8.8 mmoles of component (c) per gram of all components (a), (b) and (e) in total and at least 0.11 meqs of all the first, second, third and fourth H-donor moieties in total per gram of component (c); introducing the polymerizable composition into a lens mold; curing thermally or actinically the polymerizable composition in the lens mold to form a silicone hydrogel contact lens, wherein the silicone hydrogel contact lens has an oxygen permeability of at least 50 barrers, an elastic modulus of from about 0.2 MPa to about 1.5 MPa, and an equilibrium water content of from about 40% to about 70% and is inherently wettable as characterized by having a water-break-up-time of at least 10 seconds and a water contact angle by captive bubble of about 80 degrees or less without being subjected to any post-curing surface treatment.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Generally, the nomenclature used herein and the laboratory procedures are well known and commonly employed in the art. Conventional methods are used for these procedures, such as those provided in the art and various general references. Where a term is provided in the singular, the inventors also contemplate the plural of that term. The nomenclature used herein and the laboratory procedures described below are those well-known and commonly employed in the art. Also, as used in the specification including the appended claims, reference to singular forms such as “a,” “an,” and “the” include the plural, and reference to a particular numerical value includes at least that particular value, unless the context clearly dictates otherwise. “About” as used herein means that a number referred to as “about” comprises the recited number plus or minus 1-10% of that recited number.
“Contact Lens” refers to a structure that can be placed on or within a wearer's eye. A contact lens can correct, improve, or alter a user's eyesight, but that need not be the case. A contact lens can be of any appropriate material known in the art or later developed, and can be a soft lens, a hard lens, or a hybrid lens. A “silicone hydrogel contact lens” refers to a contact lens comprising a silicone hydrogel bulk (core) material.
A “soft contact lens” refers to a contact lens which has an elastic modulus (i.e., Young's modulus) of less than 2.5 MPa.
A “hydrogel” or “hydrogel material” refers to a crosslinked polymeric material which has three-dimensional polymer networks (i.e., polymer matrix), is insoluble in water, but can hold at least 10% by weight of water in its polymer matrix when it is fully hydrated (or equilibrated).
A “silicone hydrogel” refers to a silicone-containing hydrogel obtained by copolymerization of a polymerizable composition comprising at least one silicone-containing monomer or at least one silicone-containing macromer or at least one crosslinkable silicone-containing prepolymer.
As used in this application, the term “non-silicone hydrogel” refers to a hydrogel that is theoretically free of silicon.
“Hydrophilic,” as used herein, describes a material or portion thereof that will more readily associate with water than with lipids.
A “vinylic monomer” refers to a compound that has one sole ethylenically unsaturated group, is soluble in a solvent, and can be polymerized actinically or thermally.
The term “room temperature” refers to a temperature of about 21° C. to about 27° C.
The term “soluble”, in reference to a compound or material in a solvent, means that the compound or material can be dissolved in the solvent to give a solution with a concentration of at least about 0.02% by weight at room temperature.
The term “insoluble”, in reference to a compound or material in a solvent, means that the compound or material can be dissolved in the solvent to give a solution with a concentration of less than 0.005% by weight at room temperature.
As used in this application, the term “ethylenically unsaturated group” is employed herein in a broad sense and is intended to encompass any groups containing at least one >C═C<group. Exemplary ethylenically unsaturated groups include without limitation (meth)acryloyl
allyl, vinyl, styrenyl, or other C═C containing groups.
The term “terminal (meth)acryloyl group” refers to one (meth)acryloyl group at one of the two ends of the main chain (or backbone) of an organic compound as known to a person skilled in the art.
The term “(meth)acrylamide” refers to methacrylamide and/or acrylamide.
The term “(meth)acrylate” refers to methacrylate and/or acrylate.
As used herein, “actinically” in reference to curing, crosslinking or polymerizing of a polymerizable composition, a prepolymer or a material means that the curing (e.g., crosslinked and/or polymerized) is performed by actinic irradiation, such as, for example, UV/visible irradiation, ionizing radiation (e.g. gamma ray or X-ray irradiation), microwave irradiation, and the like. Thermal curing or actinic curing methods are well-known to a person skilled in the art.
A “hydrophilic vinylic monomer”, as used herein, refers to a vinylic monomer which as a homopolymer typically yields a polymer that is water-soluble or can absorb at least 10 percent by weight of water.
A “hydrophobic vinylic monomer”, as used herein, refers to a vinylic monomer which as a homopolymer typically yields a polymer that is insoluble in water and can absorb less than 10% by weight of water.
A “blending vinylic monomer” refers to a vinylic monomer capable of dissolving both hydrophilic and hydrophobic components of a polymerizable composition to form a solution.
An “acrylic monomer” refers to a vinylic monomer having one sole (meth)acryloyl group.
An “N-vinyl amide monomer” refers to an amide compound having a vinyl group (—CH═CH2) that is directly attached to the nitrogen atom of the amide group.
A “macromer” or “prepolymer” refers to a compound or polymer that contains ethylenically unsaturated groups and has a number average molecular weight of greater than 700 Daltons.
As used in this application, the term “vinylic crosslinker” refers to an organic compound having at least two ethylenically unsaturated groups. A “vinylic crosslinking agent” refers to a vinylic crosslinker having a molecular weight of 700 Daltons or less.
As used in this application, the term “polymer” means a material formed by polymerizing/crosslinking one or more monomers or macromers or prepolymers or combinations thereof.
As used in this application, the term “molecular weight” of a polymeric material (including monomeric or macromeric materials) refers to the number average molecular weight unless otherwise specifically noted or unless testing conditions indicate otherwise.
A “polysiloxane segment” refers to a polymer chain consisting of at least three consecutively- and directly-linked siloxane units (divalent radical) each independent of one another having a formula of
in which R1′ and R2′ are two substituents independently selected from the group consisting of C1-C10 alkyl, C1-C4-alkyl- or C1-C4-alkoxy-substituted phenyl, C1-C10 fluoroalkyl, C1-C10 fluoroether, C6-C18 aryl radical, -alk-(OC2H4)γ1—ORo (in which alk is C1-C6 alkyl diradical, Ro is H or C1-C4 alkyl and γ1 is an integer from 1 to 10), a C2-C40 organic radical having at least one functional group selected from the group consisting of hydroxyl group (—OH), carboxyl group (—COOH), —NR3′R4′, amino linkages of —NR3′—, amide linkages of —CONR3′—, amide of —CONR3′R4′, urethane linkages of —OCONH—, and C1-C4 alkoxy group, or a linear hydrophilic polymer chain, in which R3′ and R4′ independent of each other are hydrogen or a C1-C15 alkyl.
A “polysiloxane vinylic crosslinker” refers to a compound comprising at least one polysiloxane segment and at least two ethylenically-unsaturated groups.
A “linear polysiloxane vinylic crosslinker” refers to a compound comprising a main chain which includes at least one polysiloxane segment and is terminated with one ethylenically-unsaturated group at each of the two ends of the main chain.
A “chain-extended polysiloxane vinylic crosslinker” refers to a compound comprising at least two ethylenically-unsaturated groups and at least two polysiloxane segments each pair of which are linked by one divalent radical.
The term “fluid” as used herein indicates that a material is capable of flowing like a liquid.
As used in this application, the term “clear” in reference to a polymerizable composition means that the polymerizable composition is a transparent solution or liquid mixture (i.e., having a light transmissibility of 85% or greater, preferably 90% or greater in the range between 400 to 700 nm).
The term “alkyl” refers to a monovalent radical obtained by removing a hydrogen atom from a linear or branched alkane compound. An alkyl group (radical) forms one bond with one other group in an organic compound.
The term “alkylene divalent group” or “alkylene diradical” or “alkyl diradical” interchangeably refers to a divalent radical obtained by removing one hydrogen atom from an alkyl. An alkylene divalent group forms two bonds with other groups in an organic compound.
The term “alkoxy” or “alkoxyl” refers to a monovalent radical obtained by removing the hydrogen atom from the hydroxyl group of a linear or branched alkyl alcohol. An alkoxy group (radical) forms one bond with one other group in an organic compound.
In this application, the term “substituted” in reference to an alkyl diradical or an alkyl radical means that the alkyl diradical or the alkyl radical comprises at least one substituent which replaces one hydrogen atom of the alkyl diradical or the alkyl radical and is selected from the group consisting of hydroxyl (—OH), carboxyl (—COOH), —NH2, sulfhydryl (—SH), C1-C4 alkyl, C1-C4 alkoxy, C1-C4 alkylthio (alkyl sulfide), C1-C4 acylamino, C1-C4 alkylamino, di-C1-C4 alkylamino, and combinations thereof.
A free radical initiator can be either a photoinitiator or a thermal initiator. A “photoinitiator” refers to a chemical that initiates free radical crosslinking/polymerizing reaction by the use of light. A “thermal initiator” refers to a chemical that initiates radical crosslinking/polymerizing reaction by the use of heat energy.
The intrinsic “oxygen permeability”, Dki, of a material is the rate at which oxygen will pass through a material. As used in this application, the term “oxygen permeability (Dk)” in reference to a hydrogel (silicone or non-silicone) or a contact lens means a corrected oxygen permeability (Dkc) which is measured at about 34-35° C. and corrected for the surface resistance to oxygen flux caused by the boundary layer effect according to the procedures described in Example 1 of U.S. Pat. Appl. Pub. No. 2012-0026457 A1. Oxygen permeability is conventionally expressed in units of barrers, where “barrer” is defined as [(cm3 oxygen)(mm)/(cm2)(sec)(mm Hg)]×10−10.
The “oxygen transmissibility”, Dk/t, of a lens or material is the rate at which oxygen will pass through a specific lens or material with an average thickness of t [in units of mm] over the area being measured. Oxygen transmissibility is conventionally expressed in units of barrers/mm, where “barrers/mm” is defined as [(cm3 oxygen)/(cm2)(sec)(mm Hg)]×10−9.
“Ophthalmically compatible”, as used herein, refers to a material or surface of a material which may be in intimate contact with the ocular environment for an extended period of time without significantly damaging the ocular environment and without significant user discomfort.
The term “modulus” or “elastic modulus” in reference to a contact lens or a material means the tensile modulus or Young's modulus which is a measure of the stiffness of a contact lens or a material. A person skilled in the art knows well how to determine the elastic modulus of a silicone hydrogel material or a contact lens. For example, all commercial contact lenses have reported values of elastic modulus. It can be measured as described in Example 1.
“UVA” refers to radiation occurring at wavelengths between 315 and 380 nanometers; “UVB” refers to radiation occurring between 280 and 315 nanometers; “Violet” refers to radiation occurring at wavelengths between 380 and 440 nanometers.
“UVA transmittance” (or “UVA % T”), “UVB transmittance” or “UVB % T”, and “violet-transmittance” or “Violet % T” are calculated by the following formula
in which is Luminescence % T is determined by the following formula
Luminescence % T=Average % Transmission between 780-380 nm.
An “H-donor moiety” refers to a functional group which comprises a hydrogen atom capable of forming a hydrogen bond with another functional group. Examples of H-donor moieties include without limitation hydroxyl group, amide group of —CONHRo, amide linkage of —CONH—, urethane linkage of —OCONH—, urea linkage of —HNCONH—, carboxyl group of —COOH, amino groups of —NHRo, amino linkages of —NH—, and combinations thereof, wherein Ro is H or a C1-C4 alkyl.
The term “inherently wettable” in reference to a silicone hydrogel contact lens means that the silicone hydrogel has water-break-up-time (WBUT) of about 10 seconds or more and a water contact angle by captive bubble (WCAcb) of about 80 degree or less without being subjected to any surface treatment after the silicone hydrogel contact lens is formed by thermally or actinically polymerizing (i.e., curing) a silicone hydrogel lens formulation. In accordance with the invention, WBUT and WCAcb are measured according to the procedures described in Example 1.
“Surface modification” or “surface treatment”, as used herein, means that an article has been treated in a surface treatment process (or a surface modification process) prior to or posterior to the formation of the article, in which (1) a coating is applied to the surface of the article, (2) chemical species are adsorbed onto the surface of the article, (3) the chemical nature (e.g., electrostatic charge) of chemical groups on the surface of the article are altered, or (4) the surface properties of the article are otherwise modified. Exemplary surface treatment processes include, but are not limited to, a surface treatment by energy (e.g., a plasma, a static electrical charge, irradiation, or other energy source), chemical treatments, the grafting of hydrophilic vinylic monomers or macromers onto the surface of an article, mold-transfer coating process disclosed in U.S. Pat. No. 6,719,929, the incorporation of wetting agents into a lens formulation for making contact lenses proposed in U.S. Pat. Nos. 6,367,929 and 6,822,016, reinforced mold-transfer coating disclosed in U.S. Pat. No. 7,858,000, and a hydrophilic coating composed of covalent attachment or physical deposition of one or more layers of one or more hydrophilic polymer onto the surface of a contact lens disclosed in U.S. Pat. Nos. 8,147,897 and 8,409,599 and U.S. Pat. Appl. Pub. Nos. 2011-0134387 A1, 2012-0026457 A1 and 2013-0118127 A1.
“Post-curing surface treatment”, in reference to a silicone hydrogel bulk material or a SiHy contact lens, means a surface treatment process that is performed after the silicone hydrogel bulk material or the SiHy contact lens is formed by curing (i.e., thermally or actinically polymerizing) a SiHy lens formulation. A “SiHy lens formulation” refers to a polymerizable composition that comprises all necessary polymerizable components for producing a SiHy contact lens or a SiHy lens bulk material as well known to a person skilled in the art.
The invention is generally related to a method for producing inherently-wettable SiHy contact lenses with a relatively high oxygen permeability, a desired water content (e.g., from about 40% to about 70% by weight), and a relatively low elastic modulus (e.g., from about 0.2 MPa to about 1.5 MPa). As reported in two commonly-owned copending patent applications filed on the same date with this application, this invention is partly based on the discovery that inherently-wettable SiHy contact lenses can be formed from a SiHy lens formulation (i.e., a polymerizable composition) that comprises a polysiloxane vinylic crosslinker (“Di-PDMS”) having H-donor moieties (“H-D”), a siloxane-containing vinylic monomer (“mono-PDMS”) with or without H-donor moieties, a N-vinyl amide monomer (“NVA”) (e.g., N-vinylpyrrolidone, N-vinyl-N-methyl acetamide, or the like), and optionally other silicone-containing polymerizable component(s) with or without H-donor moieties, provided that the SiHy lens formulation comprise about 8.8 mmoles or more of all N-vinyl amide monomer(s) (“NVA”) per gram of all the silicone-containing polymerizable components (i.e.
and about 0.11 milliequivalents (“meq”) or more of the H-donor moieties per gram of all N-vinyl amide monomer(s) ((i.e.,
which are contributed from the polysiloxane vinylic crosslinker and the siloxane-containing vinylic monomer, per gram of the N-vinyl amide monomer. The resultant SiHy lenses not only can be inherently wettable, but also can have a combination of the desired contact lens properties including relatively high oxygen permeability, relatively high water content, relatively low modulus, and relatively-low surface atomic Si percentage. This invention is also partly based on the discovery that, by adding a sufficient amount of methyl methacrylate in a SiHy lens formulation for making inherently wetable SiHy contact lenses, the robusteness of lens shape of resultant SiHy contact lenses can be increased compared to those obtained from a control lens formulation without methyl methacrylate. It is found that when a lens formulation having less than 5 weight parts units of methyl macrylate, SiHy contact lenses cast-molded from such a lens formulation may have macroscopically winkled lens surface that in turn causes a non-round lens shape, namely, severe defects in lens morphology. When the concentration methyl methacrylate in the lens formulation is increased to 7 weight part units or higher, no resultant SiHy contact lenses can have any more winkled lens lens surface and non-round lens shape. By increasing the robusteness of lens shape, the production yield can be increased and the production cost can be decreased. This invention is further partly based on the discovery that methyl methacrylate can also function as delens aid for facilitating removal of inherently wettable SiHy contact lenses in a dry state (i.e., the lenses without contacting with water or any solvent after being cast molded) from molds, and thereby may reduce lens damages during demolding and delensing process and the production cost.
The invention, in one aspect, provides a method for producing naturally wettable silicone hydrogel contact lenses with a robusteness of lens shape, comprising the steps of: preparing a polymerizable composition which is clear at room temperature and optionally (but preferably) at a temperature of from about 0 to about 4° C., wherein the polymerizable composition comprises (a) at least one siloxane-containing vinylic monomer including 0 to 10 first H-donor moieties, (b) at least one first polysiloxane vinylic crosslinker which has a number average molecular weight of from about 3000 Daltons to about 80,000 Daltons (preferably from about 4000 to about 40000 Daltons, more preferably from about 5000 to about 20000 Daltons) and comprises (i) two terminal (meth)acryloyl groups, (ii) at least one polysiloxane segment comprising dimethylsiloxane units and hydrophilized siloxane units each having one methyl substituent and one monovalent C4-C40 organic radical substituent having one or more second H-donor moieties, and (iii) from 0 to 20 third H-donor moieties which are integral parts of molecular structures outside of the polysiloxane segment, (c) at least one hydroany philic N-vinyl amide monomer, (d) a C1-C4 alkyl (meth)acrylate in an amount for increasing the robusteness of lens shape of silicone hydrogel contact lenses produced from the polymerizable composition relative to a control polymerizable composition free of C1-C4 alkyl (meth)acrylate, (e) optionally at least one second polysiloxane vinylic crosslinker having 0 to 35 fourth H-donor moieties, and (f) at least one free radical initiator, wherein the first and second polysiloxane vinylic crosslinkers are different from each other, wherein the first, second, third and fourth H-donor moieties independent of one another are hydroxyl groups, carboxyl groups, amino groups of —NHRo, amino linkages of —NH—, amide linkages of —CONH—, urethane linkages of —OCONH—, or combinations thereof, wherein Ro is H or a C1-C4 alkyl, wherein the polymerizable composition comprises at least 8.8 (preferably at least 9.0, more preferably at least 9.2, even more preferably at least 9.6) mmoles of component (c) per gram of all components (a), (b) and (e) in total and at least 0.11 (preferably at least 0.15, more preferably at least 0.20, even more preferably at least 0.25) meqs of all the first, second, third and fourth H-donor moieties in total per gram of component (c); introducing the polymerizable composition into a lens mold; curing thermally or actinically the polymerizable composition in the lens mold to form a silicone hydrogel contact lens, wherein the silicone hydrogel contact lens has an oxygen permeability of at least 50 barrers (preferably at least 60 barrers, more preferably at least 70 barrers, even more preferably at least 80 barrers, most preferably at least 100 barrers), an elastic modulus of from about 0.2 MPa to about 1.5 MPa (preferably from about 0.3 MPa to about 1.2 MPa, more preferably from about 0.4 MPa to about 1.0 MPa), and an equilibrium water content of from about 40% to about 70% (preferably from about 43% to about 65%, more preferably from about 45% to about 60%) by weight and is inherently wettable as characterized by having a water-break-up-time of at least 10 seconds (preferably at least 15 seconds, more preferably at least 20 seconds) and a water contact angle by captive bubble of about 80 degrees or less (preferably about 75 degrees or less, more preferably about 70 degrees or less, even more preferably about 65 degrees or less) without being subjected to any post-curing surface treatment.
Any suitable siloxane-containing vinylic monomers can be used in the invention.
One class of preferred siloxane containing vinylic monomers is mono-(meth)acryloyl-terminated monoalkyl-terminated polysiloxanes. Examples of mono-(meth)acryloyl-terminated monoalkyl-terminated polysiloxanes include without limitation α-(meth)acryloxypropyl terminated ω-butyl (or ω-methyl) terminated polydimethylsiloxane, α-(meth)acryloxy-2-hydroxypropyloxypropyl terminated ω-butyl (or ω-methyl) terminated polydimethylsiloxane, α-(2-hydroxyl-methacryloxypropyloxypropyl)-ω-butyl-decamethylpentasiloxane, α-[3-(meth)acryloxyethoxy-2-hydroxypropyloxypropyl]-terminated ω-butyl (or ω-methyl) terminated polydimethylsiloxane, α-[3-(meth)acryloxy-propyloxy-2-hydroxypropyloxypropyl]-terminated ω-butyl (or ω-methyl) terminated polydimethylsiloxane, α-[3-(meth)acryloxyisopropyloxy-2-hydroxypropyloxypropyl]-terminated ω-butyl (or ω-methyl) terminated polydimethylsiloxane, α-[3-(meth)acryloxybutyloxy-2-hydroxypropyloxypropyl]-terminated ω-butyl (or ω-methyl) terminated polydimethylsiloxane, α-[3-(meth)acryloxyethylamino-2-hydroxypropyloxypropyl]-terminated ω-butyl (or ω-methyl) terminated polydimethylsiloxane, α-[3-(meth)acryloxypropylamino-2-hydroxypropyloxypropyl]-terminated ω-butyl (or ω-methyl) terminated polydimethylsiloxane, α-[3-(meth)acryloxybutylamino-2-hydroxypropyloxypropyl]-terminated ω-butyl (or ω-methyl) terminated polydimethylsiloxane, α-(meth)acryloxy(polyethylenoxy)-2-hydroxypropyloxypropyl]-terminated ω-butyl (or ω-methyl) terminated polydimethylsiloxane, α-[(meth)acryloxy-2-hydroxypropyloxy-ethoxypropyl]-terminated ω-butyl (or ω-methyl) terminated polydimethylsiloxane, α-[(meth)acryloxy-2-hydroxypropyl-N-ethylaminopropyl]-terminated ω-butyl (or ω-methyl) terminated polydimethylsiloxane, α-[3-(meth)acryloxy-2-hydroxypropyl-aminopropyl]-terminated ω-butyl (or ω-methyl) terminated polydimethylsiloxane, α-[(meth)acryloxy-2-hydroxypropyloxy-(polyethylenoxy)propyl]-terminated ω-butyl (or ω-methyl) terminated polydimethylsiloxane, α-(meth)acryloylamidopropyloxypropyl terminated ω-butyl (or ω-methyl) terminated polydimethylsiloxane, α-N-methyl-(meth)acryloylamidopropyloxypropyl terminated ω-butyl (or ω-methyl) terminated polydimethylsiloxane, α-[3-(meth)acrylamidoethoxy-2-hydroxypropyloxypropyl]-terminated ω-butyl (or ω-methyl) polydimethylsiloxane, α-[3-(meth)acrylamidopropyloxy-2-hydroxypropyloxypropyl]-terminated ω-butyl (or ω-methyl) terminated polydimethylsiloxane, α-[3-(meth)acrylamidoisopropyloxy-2-hydroxypropyloxypropyl]-terminated ω-butyl (or ω-methyl) terminated polydimethylsiloxane, α-[3-(meth)acrylamidobutyloxy-2-hydroxypropyloxypropyl]-terminated ω-butyl (or ω-methyl) terminated polydimethylsiloxane, α-[3-(meth)acryloylamido-2-hydroxypropyloxypropyl] terminated ω-butyl (or ω-methyl) polydimethylsiloxane, α-[3-[N-methyl-(meth)acryloylamido]-2-hydroxypropyloxypropyl]terminated ω-butyl (or ω-methyl) terminated polydimethylsiloxane, N-methyl-N′-(propyltetra(dimethylsiloxy)dimethylbutylsilane) (meth)acrylamide, N-(2,3-dihydroxypropane)-N′-(propyltetra(dimethylsiloxy)dimethylbutylsilane) (meth)acrylamide, (meth)acryloylamidopropyltetra(dimethylsiloxy)dimethylbutylsilane, and mixtures thereof. Mono-(meth)acryloyl-terminated, monoalkyl-terminated polysiloxanes can be obtained from commercial suppliers (e.g., Shin-Etsu, Gelest, etc.) or prepared according to procedures described in U.S. Pat. Nos. 6,867,245, 8,415,405, 8,475,529, 8,614,261, and 9,217,813 or by reacting a hydroxyalkyl (meth)acrylate or (meth)acrylamide or a (meth)acryloxypolyethylene glycol with a mono-epoxypropyloxypropyl-terminated polydimethylsiloxane, by reacting glycidyl (meth)acrylate with a mono-carbinol-terminated polydimethylsiloxane, a mono-aminopropyl-terminated polydimethylsiloxane, or a mono-ethylaminopropyl-terminated polydimethylsiloxane, ob by reacting isocyanatoethyl (meth)acrylate with a mono-carbinol-terminated polydimethylsiloxane according to coupling reactions well known to a person skilled in the art.
Another class of preferred siloxane containing vinylic monomers is vinylic monomers containing a tris(trimethylsilyloxy)silyl or bis(trimethylsilyloxy)alkylsilyl group (i.e., tris(trimethylsilyloxy)silyl-containing vinylic monomer or bis(trimethylsilyloxy)alkylsilyl-containing vinylic monomer. Examples of preferred siloxane-containing vinylic monomers include without limitation tris(trimethylsilyloxy)silylpropyl (meth)acrylate, [3-(meth)acryloxy-2-hydroxypropyloxy]propylbis(trimethylsiloxy)methylsilane, [3-(meth)acryloxy-2-hydroxypropyloxy]propylbis(trimethylsiloxy)butylsilane, 3-(meth)acryloxy-2-(2-hydroxyethoxy)-propyloxy)propylbis(trimethylsiloxy)methylsilane, N-[tris(trimethylsiloxy)silylpropyl]-(meth)acrylamide, N-(2-hydroxy-3-(3-(bis(trimethylsilyloxy)methylsilyl)propyloxy)propyl)-2-methyl (meth)acrylamide, N-(2-hydroxy-3-(3-(bis(trimethylsilyloxy)methylsilyl)propyloxy)propyl) (meth)acrylamide, N-(2-hydroxy-3-(3-(tris(trimethylsilyloxy)silyl)propyloxy)propyl)-2-methyl acrylamide, N-(2-hydroxy-3-(3-(tris(trimethylsilyloxy)silyl)propyloxy)propyl) (meth)acrylamide, and mixtures thereof. Preferred siloxane-containing vinylic monomers can be obtained from commercial suppliers or can be prepared according to procedures described in U.S. Pat. Nos. 7,214,809, 8,475,529, 8,658,748, 9,097,840, 9,103,965, and 9,475,827.
In accordance with the present invention, the siloxane-containing vinylic monomer is preferably a mono-(meth)acryloyl-terminated monoalkyl-terminated polysiloxane, a bis(trimethylsilyloxy)alkylsilyl-containing vinylic monomer, or mixtures thereof, more preferably a mono-(meth)acryloyl-terminated monoalkyl-terminated polysiloxane having a weight-average molecular weight of about 2500 Daltons or less (preferably about 2000 Daltons or less, more preferably about 1700 Daltons or less, even more preferably from about 450 to about 1500 Daltons).
It is understood that by having at least one H-donor moiety, the siloxane-containing vinylic monomer can be more compatible with hydrophilic N-vinyl amide monomer compared to one without any H-donor moiety.
In accordance with the invention, any polysiloxane vinylic crosslinker can be used in the invention, so long as it comprises hydrophilized siloxane units each having one methyl substituent and one monovalent C4-C40 organic radical substituent having one or more H-donor moieties and has a number average molecular weight of from about 3000 Daltons to about 80,000 Daltons (preferably from about 4000 to about 40000 Daltons, more preferably from about 5000 to about 20000 Daltons).
Preferably, the first polysiloxane vinylic crosslinker comprises: (1) a polysiloxane segment comprising dimethylsiloxane units and hydrophilized siloxane units each having one methyl substituent and one monovalent C4-C40 organic radical substituent having 2 to 6 second H-donor moieties, wherein the molar ratio of the hydrophilized siloxane units to the dimethylsiloxane units is from about 0.035 to about 0.15; (2) two terminal (meth)acryloyl groups; and (3) from 0 to 20 third H-donor moieties, wherein the polysiloxane vinylic crosslinker has a number average molecular weight of from about 3000 Daltons to about 80,000 Daltons.
More preferably, the first polysiloxane vinylic crosslinker is a compound of formula (1)
in which:
X01 is O or NRn in which Rn is hydrogen or C1-C10-alkyl;
R0 is hydrogen or methyl;
R2 and R3 independently of each other are a substituted or unsubstituted C1-C10 alkylene divalent radical or a divalent radical of —R5—O—R6— in which R5 and R6 independently of each other are a substituted or unsubstituted C1-C10 alkylene divalent radical;
R4 is a monovalent radical of any one of formula (2) to (6)
p1 is zero or 1; m1 is an integer of 2 to 4; m2 is an integer of 1 to 5; m3 is an integer of 3 to 6; m4 is an integer of 2 to 5
R7 is hydrogen or methyl;
R8 is a C2-C6 hydrocarbon radical having (m2+1) valencies;
R9 is a C2-C6 hydrocarbon radical having (m4+1) valencies;
R10 is ethyl or hydroxymethyl;
R11 is methyl or hydromethyl;
R12 is hydroxyl or methoxy;
X3 is a sulfur linkage of —S— or a tertiary amino linkage of —NR13— in which R13 is C1-C1 alkyl, hydroxyethyl, hydroxypropyl, or 2,3-dihydroxypropyl; and
X4 is an amide linkage of —NR14—CO— or —CO—NR14— in which R14 is hydrogen or C1-C10 alkyl.
In a preferred embodiment, the monovalent radical R4 is a radical of formula (6) in which m1 is 3, p1 is 1, and R7 is hydrogen. Such a preferred first polysiloxane vinylic crosslinker is represented by formula (A)
in which υ1 and ω1 are as defined above.
The procedures for preparing a polysiloxane vinylic crosslinkers of formula (1) have been described in detail in U.S. Pat. Appl. Pub. No. 2017-0166673 A1.
It is understood that component (e) (i.e., at least one second polysiloxane vinylic crosslinker) is an optional component in the polymerizable composition of the invention. Any suitable polysiloxane vinylic crosslinkers other than those polysiloxane vinylic crosslinkers having hydrophilized siloxane units described above can be used in the inventions, so long as each of them comprises at least one polysiloxane segment and at least two ethylenically-unsaturated groups. Examples of such polysiloxane vinylic crosslinkers are di-(meth)acryloyloxy-terminated polydimethylsiloxanes of various molecular weight; divinyl carbonate-terminated polydimethylsiloxanes; divinyl carbamate-terminated polydimethylsiloxane; divinyl terminated polydimethylsiloxanes of various molecular weight; di-(meth)acrylamido-terminated polydimethylsiloxanes; N,N,N′,N′-tetrakis(3-methacryloxy-2-hydroxypropyl)-alpha,omega-bis-3-aminopropyl-polydimethylsiloxane; chain-extended polysiloxane vinylic crosslinkers which comprises at least two polysiloxane segments and at least one divalent organic radical linking each pair of adjacent polysiloxane segments and having one or more H-donor moieties (see, e.g., those disclosed in U.S. Pat. Nos. 5,034,461, 5,416,132, 5,449,729, 5,760,100, 7,423,074, 8,529,057, and 8,993,651 and in U.S. Pat. App. Pub. No. 2018-0100053 A1); siloxane-containing macromer selected from the group consisting of Macromer A, Macromer B, Macromer C, and Macromer D described in U.S. Pat. No. 5,760,100; the reaction products of glycidyl methacrylate with amino-functional polydimethylsiloxanes; polysiloxane-containing macromers disclosed in U.S. Pat. Nos. 4,136,250, 4,153,641, 4,182,822, 4,189,546, 4,343,927, 4,254,248, 4,355,147, 4,276,402, 4,327,203, 4,341,889, 4,486,577, 4,543,398, 4,605,712, 4,661,575, 4,684,538, 4,703,097, 4,833,218, 4,837,289, 4,954,586, 4,954,587, 5,010,141, 5,034,461, 5,070,170, 5,079,319, 5,039,761, 5,346,946, 5,358,995, 5,387,632, 5,416,132, 5,451,617, 5,486,579, 5,962,548, 5,981,675, 6,039,913, and 6,762,264; polysiloxane-containing macromers disclosed in U.S. Pat. Nos. 4,259,467, 4,260,725, and 4,261,875.
Examples of preferred di-(meth)acryloyl-terminated polydiorganosiloxanes include without limitation α,ω-bis[3-(meth)acrylamidopropyl]-terminated polydimethylsiloxane, α,ω-bis[3-(meth)acryloxypropyl]-terminated polydimethylsiloxane, α,ω-bis[3-(meth)acryloxy-2-hydroxypropyloxypropyl]-terminated polydimethylsiloxane, α,ω-bis[3-(meth)acryloxyethoxy-2-hydroxypropyloxypropyl]-terminated polydimethylsiloxane, α,ω-bis[3-(meth)acryloxypropyloxy-2-hydroxypropyloxypropyl]-terminated polydimethylsiloxane, α,ω-bis[3-(meth)acryloxyisopropyloxy-2-hydroxypropyloxypropyl]-terminated polydimethylsiloxane, α,ω-bis[3-(meth)acryloxybutyloxy-2-hydroxypropyloxypropyl]-terminated polydimethylsiloxane, α,ω-bis[3-(meth)acrylamidoethoxy-2-hydroxypropyloxypropyl]-terminated polydimethylsiloxane, α,ω-bis[3-(meth)acrylamidopropyloxy-2-hydroxypropyloxypropyl]-terminated polydimethylsiloxane, α,ω-bis[3-(meth)acrylamidoisopropyloxy-2-hydroxypropyloxypropyl]-terminated polydimethylsiloxane, α,ω-bis[3-(meth)acrylamidobutyloxy-2-hydroxypropyloxypropyl]-terminated polydimethylsiloxane, α,ω-bis[3-(meth)acryloxyethylamino-2-hydroxypropyloxypropyl]-terminated polydimethylsiloxane, α,ω-bis[3-(meth)acryloxypropylamino-2-hydroxypropyloxypropyl]-terminated polydimethylsiloxane, α,ω-bis[3-(meth)acryloxybutylamino-2-hydroxypropyloxypropyl]-terminated polydimethylsiloxane, α,ω-bis[(meth)acrylamidoethylamino-2-hydroxypropyloxypropyl]-terminated polydimethylsiloxane, α,ω-bis[3-(meth)acrylamidopropylamino-2-hydroxypropyloxypropyl]-terminated polydimethylsiloxane, α,ω-bis[3-(meth)acrylamide-butylamino-2-hydroxypropyloxypropyl]-terminated polydimethylsiloxane, a, ω-bis[(meth)acryloxy-2-hydroxypropyloxy-ethoxypropyl]-terminated polydimethylsiloxane, α,ω-bis[(meth)acryloxy-2-hydroxypropyl-N-ethylaminopropyl]-terminated polydimethylsiloxane, α,ω-bis[(meth)acryloxy-2-hydroxypropyl-aminopropyl]-polydimethylsiloxane, α,ω-bis[(meth)acryloxy-2-hydroxypropyloxy(polyethylenoxy)propyl]-terminated polydimethylsiloxane, α,ω-bis[(meth)acryloxyethylaminocarbonyloxy-ethoxypropyl]-terminated polydimethylsiloxane, α,ω-bis[(meth)acryloxyethylaminocarbonyloxy-(polyethylenoxy)propyl]-terminated polydimethylsiloxane.
In accordance with the invention, any suitable N-vinyl amide monomers can be used in the invention. Examples of preferred N-vinyl amide monomers include without limitation N-vinyl pyrrolidone, N-vinyl piperidone, N-vinyl caprolactam, N-vinyl-N-methyl acetamide, N-vinyl formamide, N-vinyl acetamide, N-vinyl isopropylamide, N-vinyl-N-methyl acetamide, N-vinyl-N-ethyl acetamide, N-vinyl-N-ethyl formamide, and mixtures thereof. Preferably, the N-vinyl amide monomer is N-vinylpyrrolidone, N-vinyl-N-methyl acetamide, or combinations thereof.
In accordance with the invention, a C1-C4 alkyl (meth)acrylate is added in the polymerizable composition in an amount sufficient for increasing the robusteness of lens shape, preferably in an amount of from about 5 to about 30 weight part units, more preferably from about 7 to about 25 weight part units or more, even more preferably from about 10 to about 20 weight part units relative to the total weight of all polymerizable components in the polymerizable composition. It ie believed that the addition of a sufficient amount of a C1-C4 alkyl (meth)acrylate in a polymerizable composition could increase the rigidity of SiHy contact lenses cast-molded from the polymerizable composition, and thereby increasing the robusteness of lens shape.
Any suitable thermal polymerization initiators, known to the skilled artisan, can be used in the invention. Examples of thermal polymerization initiators includes without limitation peroxides, hydroperoxides, azo-bis(alkyl- or cycloalkylnitriles), persulfates, percarbonates or mixtures thereof. Examples of thermal free radical initiators are benzoylperoxide, tert.-butyl peroxide, di-tert.-butyl-diperoxyphthalate, tert.-butyl hydroperoxide, azo-bis(isobutyronitrile) (AIBN), 1,1-azodiisobutyramidine, 1,1′-azo-bis (1-cyclohexanecarbonitrile), 2,2′-azo-bis(2,4-dimethylvaleronitrile) and the like. The polymerization is carried out conveniently in an above-mentioned solvent at elevated temperature, for example at a temperature of from 25 to 100° C. and preferably 40 to 80° C. The reaction time may vary within wide limits, but is conveniently, for example, from 1 to 24 hours or preferably from 2 to 12 hours. It is advantageous to previously degas the components and solvents used in the polymerization reaction and to carry out said copolymerization reaction under an inert atmosphere, e.g., under N2 or Ar atmosphere.
Suitable photoinitiators are benzoin methyl ether, diethoxyacetophenone, a benzoylphosphine oxide, 1-hydroxycyclohexyl phenyl ketone and Darocur and Irgacur types, preferably Darocur 1173® and Darocur 2959®, Germane-based Norrish Type I photoinitiators. Examples of benzoylphosphine initiators include 2,4,6-trimethylbenzoyldiphenylophosphine oxide; bis-(2,6-dichlorobenzoyl)-4-N-propylphenylphosphine oxide; and bis-(2,6-dichlorobenzoyl)-4-N-butylphenylphosphine oxide. Reactive photoinitiators which can be incorporated, for example, into a macromer or can be used as a special monomer are also suitable. Examples of reactive photoinitiators are those disclosed in EP 632 329. The polymerization can then be triggered off by actinic radiation, for example light, in particular UV light or visible light of a suitable wavelength. The spectral requirements can be controlled accordingly, if appropriate, by addition of suitable photosensitizers.
Where a vinylic monomer capable of absorbing ultra-violet radiation and high energy violet light (HEVL) is used in the invention, a Germane-based Norrish Type I photoinitiator and a light source including a light in the region of about 400 to about 550 nm are preferably used to initiate a free-radical polymerization. Any Germane-based Norrish Type I photoinitiators can be used in this invention, so long as they are capable of initiating a free-radical polymerization under irradiation with a light source including a light in the region of about 400 to about 550 nm. Examples of Germane-based Norrish Type I photoinitiators are acylgermanium compounds described in U.S. Pat. No. 7,605,190.
In accordance with the invention, a polymerizable composition can further comprise about 1% or less (preferably about 0.8% or less, more preferably from about 0.05% to about 0.6%) by weight of one or more non-silicone vinylic crosslinking agents relative to the total weight of all polymerizable components in the polymerizable composition.
Examples of preferred non-silicone vinylic cross-linking agents include without limitation ethyleneglycol di-(meth)acrylate, diethyleneglycol di-(meth)acrylate, triethyleneglycol di-(meth)acrylate, tetraethyleneglycol di-(meth)acrylate, glycerol di-(meth)acrylate, 1,3-propanediol di-(meth)acrylate, 1,3-butanediol di-(meth)acrylate, 1,4-butanediol di-(meth)acrylate, glycerol 1,3-diglycerolate di-(meth)acrylate, ethylenebis[oxy(2-hydroxypropane-1,3-diyl)] di-(meth)acrylate, bis[2-(meth)acryloxyethyl] phosphate, trimethylolpropane di-(meth)acrylate, and 3,4-bis[(meth)acryloyl]tetrahydrofuan, diacrylamide (i.e., N-(1-oxo-2-propenyl)-2-propenamide), dimethacrylamide (i.e., N-(1-oxo-2-methyl-2-propenyl)-2-methyl-2-propenamide), N,N-di(meth)acryloyl-N-methylamine, N,N-di(meth)acryloyl-N-ethylamine, N,N′-methylene bis(meth)acrylamide, N,N′-ethylene bis(meth)acrylamide, N,N′-dihydroxyethylene bis(meth)acrylamide, N,N′-propylene bis(meth)acrylamide, N,N′-2-hydroxypropylene bis(meth)acrylamide, N,N′-2,3-dihydroxybutylene bis(meth)acrylamide, 1,3-bis(meth)acrylamide-propane-2-yl dihydrogen phosphate (i.e., N,N′-2-phophonyloxypropylene bis(meth)acrylamide), piperazine diacrylamide (or 1,4-bis(meth)acryloyl piperazine), tetraethyleneglycol divinyl ether, triethyleneglycol divinyl ether, diethyleneglycol divinyl ether, ethyleneglycol divinyl ether, triallyl isocyanurate, triallyl cyanurate, trimethylopropane tri methacrylate, pentaerythritol tetramethacrylate, bisphenol A dimethacrylate, and combinations thereof. A preferred non-silicone vinylic cross-linking agent is tetra(ethyleneglycol) di-(meth)acrylate, tri(ethyleneglycol) di-(meth)acrylate, ethyleneglycol di-(meth)acrylate, di(ethyleneglycol) di-(meth)acrylate, tetraethyleneglycol divinyl ether, triethyleneglycol divinyl ether, diethyleneglycol divinyl ether, ethyleneglycol divinyl ether, triallyl isocyanurate, or triallyl cyanurate.
In accordance with a preferred embodiment of the invention, a polymerizable composition of the invention can further comprise (but preferably comprises) one or more UV-absorbing vinylic monomers and optionally (but preferably) one or more UV/HEVL-absorbing vinylic monomers. The term “UV/HEVL-absorbing vinylic monomer” refers to a vinylic monomer that can absorbs UV light and high-energy-violet-light (i.e., light having wavelength between 380 nm and 440 nm.
Any suitable UV-absorbing vinylic monomers and UV/HEVL-absorbing vinylic monomers can be used in a polymerizable composition for preparing a polymer of the invention. Examples of preferred UV-absorbing and UV/HEVL-absorbing vinylic monomers include without limitation: 2-(2-hydroxy-5-vinylphenyl)-2H-benzotriazole, 2-(2-hydroxy-5-acrylyloxyphenyl)-2H-benzotriazole, 2-(2-hydroxy-3-methacrylamido methyl-5-tert octylphenyl) benzotriazole, 2-(2′-hydroxy-5′-methacrylamidophenyl)-5-chlorobenzotriazole, 2-(2′-hydroxy-5′-methacrylamidophenyl)-5-methoxybenzotriazole, 2-(2′-hydroxy-5′-methacryloxypropyl-3′-t-butylphenyl)-5-chlorobenzotriazole, 2-(2′-hydroxy-5′-methacryloxypropyl phenyl) benzotriazole, 2-hydroxy-5-methoxy-3-(5-(trifluoromethyl)-2H-benzo[d][1,2,3]triazol-2-yl)benzyl methacrylate (WL-1), 2-hydroxy-5-methoxy-3-(5-methoxy-2H-benzo[d][1,2,3]triazol-2-yl)benzyl methacrylate (WL-5), 3-(5-fluoro-2H-benzo[d][1,2,3]triazol-2-yl)-2-hydroxy-5-methoxybenzyl methacrylate (WL-2), 3-(2H-benzo[d][1,2,3]triazol-2-yl)-2-hydroxy-5-methoxybenzyl methacrylate (WL-3), 3-(5-chloro-2H-benzo[d][1,2,3]triazol-2-yl)-2-hydroxy-5-methoxybenzyl methacrylate (WL-4), 2-hydroxy-5-methoxy-3-(5-methyl-2H-benzo[d][1,2,3]triazol-2-yl)benzyl methacrylate (WL-6), 2-hydroxy-5-methyl-3-(5-(trifluoromethyl)-2H-benzo[d][1,2,3]triazol-2-yl)benzyl methacrylate (WL-7), 4-allyl-2-(5-chloro-2H-benzo[d][1,2,3]triazol-2-yl)-6-methoxyphenol (WL-8), 2-{2′-Hydroxy-3′-tert-5-[3″-(4″-vinylbenzyloxy)propoxy]phenyl}-5-methoxy-2H-benzotriazole, phenol, 2-(5-chloro-2H-benzotriazol-2-yl)-6-(1,1-dimethylethyl)-4-ethenyl-(UVAM), 2-[2′-hydroxy-5′-(2-methacryloxyethyl)phenyl)]-2H-benzotriazole (2-Propenoic acid, 2-methyl-, 2-[3-(2H-benzotriazol-2-yl)-4-hydroxyphenyl]ethyl ester, Norbloc), 2-{2′-Hydroxy-3′-tert-butyl-5′-[3′-methacryloyloxypropoxy]phenyl}-2H-benzotriazole, 2-{2′-Hydroxy-3′-tert-butyl-5′-[3′-methacryloyloxypropoxy]phenyl}-5-methoxy-2H-benzotriazole (UV13), 2-{2′-Hydroxy-3′-tert-butyl-5′-[3′-methacryloyloxypropoxy]phenyl}-5-chloro-2H-benzotriazole (UV28), 2-[2′-Hydroxy-3′-tert-butyl-5′-(3′-acryloyloxypropoxy)phenyl]-5-trifluoromethyl-2H-benzotriazole (UV23), 2-(2′-hydroxy-5-methacrylamidophenyl)-5-methoxybenzotriazole (UV6), 2-(3-allyl-2-hydroxy-5-methylphenyl)-2H-benzotriazole (UV9), 2-(2-Hydroxy-3-methallyl-5-methylphenyl)-2H-benzotriazole (UV12), 2-3′-t-butyl-2′-hydroxy-5′-(3″-dimethylvinylsilylpropoxy)-2′-hydroxyphenyl)-5-methoxybenzotriazole (UV15), 2-(2′-hydroxy-5′-methacryloylpropyl-3′-tert-butylphenyl)-5-methoxy-2H-benzotriazole (UV16), 2-(2′-hydroxy-5′-acryloylpropyl-3′-tert-butylphenyl)-5-methoxy-2H-benzotriazole (UV16A), 2-Methylacrylic acid 3-[3-tert-butyl-5-(5-chlorobenzotriazol-2-yl)-4-hydroxyphenyl]-propyl ester (16-100, CAS #96478-15-8), 2-(3-(tert-butyl)-4-hydroxy-5-(5-methoxy-2H-benzo[d][1,2,3]triazol-2-yl)phenoxy)ethyl methacrylate (16-102); Phenol, 2-(5-chloro-2H-benzotriazol-2-yl)-6-methoxy-4-(2-propen-1-yl) (CAS #1260141-20-5); 2-[2-Hydroxy-5-[3-(methacryloyloxy)propyl]-3-tert-butylphenyl]-5-chloro-2H-benzotriazole; Phenol, 2-(5-ethenyl-2H-benzotriazol-2-yl)-4-methyl-, homopolymer (9Cl) (CAS #83063-87-0). In accordance with the invention, the polymerizable composition comprises about 0.1% to about 3.0%, preferably about 0.2% to about 2.5%, more preferably about 0.3% to about 2.0%, by weight of one or more UV-absorbing vinylic monomers, related to the amount of all polymerizable components in the polymerizable composition.
In a preferred embodiment, a polymerizable composition of the invention comprises a UV-absorbing vinylic monomer and a UV/HEVL absorbing vinylic monomer. More preferably, the silicone hydrogel contact lens is characterized by having the UVB transmittance of about 10% or less (preferably about 5% or less, more preferably about 2.5% or less, even more preferably about 1% or less) between 280 and 315 nanometers and a UVA transmittance of about 30% or less (preferably about 20% or less, more preferably about 10% or less, even more preferably about 5% or less) between 315 and 380 nanometers and a Violet transmittance of about 70% or less, preferably about 60% or less, more preferably about 50% or less, even more preferably about 40% or less) between 380 nm and 440 nm. Even more preferably, the UV-absorbing vinylic monomer is 2-[2′-hydroxy-5′-(2-methacryloxyethyl)phenyl)]-2H-benzotriazole (Norbloc), and the UV/HEVL absorbing vinylic monomer is 2-{2′-Hydroxy-3′-tert-butyl-5′-[3′-methacryloyloxypropoxy]phenyl}-2H-benzotriazole, 2-{2′-Hydroxy-3′-tert-butyl-5′-[3′-methacryloyloxypropoxy]phenyl}-5-methoxy-2H-benzotriazole (UV13), 2-{2′-Hydroxy-3′-tert-butyl-5′-[3′-methacryloyloxypropoxy]phenyl}-5-chloro-2H-benzotriazole (UV28), 2-[2′-Hydroxy-3′-tert-butyl-5′-(3′-acryloyloxypropoxy)phenyl]-5-trifluoromethyl-2H-benzotriazole (UV23), or combinations thereof.
In accordance with the invention, a polymerizable composition of the invention can further comprise one or more hydrophilic acrylic monomers, preferably in an amount of about 10% or less (preferably about 8% or less, more preferably about 5% or less) by weight relative to the total weight of all polymerizable components.
Examples of preferred hydrophilic acrylic monomers include without limitation N,N-dimethyl (meth)acrylamide, (meth)acrylamide, N-hydroxylethyl (meth)acrylamide, N-hydroxypropyl (meth)acrylamide, hydroxyethyl (meth)acrylate, glycerol methacrylate (GMA), polyethylene glycol (meth)acrylate having a number average molecular weight of up to 1500, polyethylene glycol C1-C4-alkyl ether (meth)acrylate having a number average molecular weight of up to 1500, N-[tris(hydroxymethyl)methyl]-acrylamide, (meth)acrylic acid, ethylacrylic acid, and combinations thereof. Preferably, the hydrophilic vinylic monomer is N,N-dimethyl (meth)acrylamide, hydroxyethyl (meth)acrylate, N-hydroxylethyl (meth)acrylamide, glycerol methacrylate (GMA), or combinations thereof.
A polymerizable composition of the invention can also comprise other necessary components known to a person skilled in the art, such as, for example, a visibility tinting agent (e.g., one or more polymerizable dyes, pigments, or mixtures thereof), antimicrobial agents (e.g., preferably silver nanoparticles), a bioactive agent, leachable lubricants, leachable tear-stabilizing agents, and mixtures thereof, as known to a person skilled in the art.
In a preferred embodiment, a polymerizable composition of the invention comprises about 60% or more by weight (preferably about 65% or more by weight, more preferably about 70% or more by weight, even more preferably about 75% or more by weight) of all three components, components (a) to (c), relative to the total weight of all polymerizable components.
A polymerizable composition can be prepared by dissolving all of the desirable components in any suitable solvent, such as, a mixture of water and one or more organic solvents miscible with water, an organic solvent, or a mixture of one or more organic solvents, as known to a person skilled in the art. The term “solvent” refers to a chemical that cannot participate in free-radical polymerization reaction.
Example of preferred organic solvents includes without limitation, tetrahydrofuran, tripropylene glycol methyl ether, dipropylene glycol methyl ether, ethylene glycol n-butyl ether, ketones (e.g., acetone, methyl ethyl ketone, etc.), diethylene glycol n-butyl ether, diethylene glycol methyl ether, ethylene glycol phenyl ether, propylene glycol methyl ether, propylene glycol methyl ether acetate, dipropylene glycol methyl ether acetate, propylene glycol n-propyl ether, dipropylene glycol n-propyl ether, tripropylene glycol n-butyl ether, propylene glycol n-butyl ether, dipropylene glycol n-butyl ether, tripropylene glycol n-butyl ether, propylene glycol phenyl ether dipropylene glycol dimetyl ether, polyethylene glycols, polypropylene glycols, ethyl acetate, butyl acetate, amyl acetate, methyl lactate, ethyl lactate, i-propyl lactate, methylene chloride, 2-butanol, 1-propanol, 2-propanol, menthol, cyclohexanol, cyclopentanol and exonorborneol, 2-pentanol, 3-pentanol, 2-hexanol, 3-hexanol, 3-methyl-2-butanol, 2-heptanol, 2-octanol, 2-nonanol, 2-decanol, 3-octanol, norborneol, tert-butanol, tert-amyl alcohol, 2-methyl-2-pentanol, 2,3-dimethyl-2-butanol, 3-methyl-3-pentanol, 1-methylcyclohexanol, 2-methyl-2-hexanol, 3,7-dimethyl-3-octanol, 1-chloro-2-methyl-2-propanol, 2-methyl-2-heptanol, 2-methyl-2-octanol, 2-2-methyl-2-nonanol, 2-methyl-2-decanol, 3-methyl-3-hexanol, 3-methyl-3-heptanol, 4-methyl-4-heptanol, 3-methyl-3-octanol, 4-methyl-4-octanol, 3-methyl-3-nonanol, 4-methyl-4-nonanol, 3-methyl-3-octanol, 3-ethyl-3-hexanol, 3-methyl-3-heptanol, 4-ethyl-4-heptanol, 4-propyl-4-heptanol, 4-isopropyl-4-heptanol, 2,4-dimethyl-2-pentanol, 1-methylcyclopentanol, 1-ethylcyclopentanol, 1-ethylcyclopentanol, 3-hydroxy-3-methyl-1-butene, 4-hydroxy-4-methyl-1-cyclopentanol, 2-phenyl-2-propanol, 2-methoxy-2-methyl-2-propanol 2,3,4-trimethyl-3-pentanol, 3,7-dimethyl-3-octanol, 2-phenyl-2-butanol, 2-methyl-1-phenyl-2-propanol and 3-ethyl-3-pentanol, 1-ethoxy-2-propanol, 1-methyl-2-propanol, t-amyl alcohol, isopropanol, 1-methyl-2-pyrrolidone, N,N-dimethylpropionamide, dimethyl formamide, dimethyl acetamide, dimethyl propionamide, N-methyl pyrrolidinone, and mixtures thereof.
Lens molds for making contact lenses are well known to a person skilled in the art and, for example, are employed in cast molding or spin casting. For example, a mold (for cast molding) generally comprises at least two mold sections (or portions) or mold halves, i.e. first and second mold halves. The first mold half has a first molding (or optical) surface defining the anterior surface of a contact lens and the second mold half has a second molding (or optical) surface defining the posterior surface of the contact lens. The first and second mold halves are configured to receive each other such that a lens forming cavity is formed between the first molding surface and the second molding surface. The molding surface of a mold half is the cavity-forming surface of the mold and in direct contact with lens-forming material.
Methods of manufacturing mold sections for cast-molding a contact lens are generally well known to those of ordinary skill in the art. The process of the present invention is not limited to any particular method of forming a mold. In fact, any method of forming a mold can be used in the present invention. The first and second mold halves can be formed through various techniques, such as injection molding or lathing. Examples of suitable processes for forming the mold halves are disclosed in U.S. Pat. Nos. 4,444,711; 4,460,534; 5,843,346; and 5,894,002.
Virtually all materials known in the art for making molds can be used to make molds for making contact lenses. For example, polymeric materials, such as polyethylene, polypropylene, polystyrene, PMMA, Topas® COC grade 8007-S10 (clear amorphous copolymer of ethylene and norbornene, from Ticona GmbH of Frankfurt, Germany and Summit, N.J.), or the like can be used. Other materials that allow UV light transmission could be used, such as quartz glass and sapphire.
In accordance with the invention, the polymerizable composition can be introduced (dispensed) into a cavity formed by a mold according to any known methods.
After the polymerizable composition is dispensed into the mold, it is polymerized to produce a contact lens. Crosslinking may be initiated thermally or actinically to crosslink the polymerizable components in the polymerizable composition.
Opening of the mold so that the molded article can be removed from the mold may take place in a manner known per se.
The molded contact lens can be subject to lens extraction to remove unpolymerized polymerizable components. The extraction solvent can be any solvent known to a person skilled in the art. Examples of suitable extraction solvent are those solvent described above. After extraction, lenses can be hydrated in water or an aqueous solution of a wetting agent (e.g., a hydrophilic polymer).
The molded contact lenses can further subject to further processes, such as, for example, hydration, packaging in lens packages with a packaging solution which is well known to a person skilled in the art; sterilization such as autoclave at from 118 to 124° C. for at least about 30 minutes; and the like.
Lens packages (or containers) are well known to a person skilled in the art for autoclaving and storing a soft contact lens. Any lens packages can be used in the invention. Preferably, a lens package is a blister package which comprises a base and a cover, wherein the cover is detachably sealed to the base, wherein the base includes a cavity for receiving a sterile packaging solution and the contact lens.
Lenses are packaged in individual packages, sealed, and sterilized (e.g., by autoclave at about 120° C. or higher for at least 30 minutes under pressure) prior to dispensing to users. A person skilled in the art will understand well how to seal and sterilize lens packages.
Although various embodiments of the invention have been described using specific terms, devices, and methods, such description is for illustrative purposes only. The words used are words of description rather than of limitation. It is to be understood that changes and variations may be made by those skilled in the art without departing from the spirit or scope of the present invention, which is set forth in the following claims. In addition, it should be understood that aspects of the various embodiments may be interchanged either in whole or in part or can be combined in any manner and/or used together.
The previous disclosure will enable one having ordinary skill in the art to practice the invention. Various modifications, variations, and combinations can be made to the various embodiment described herein. In order to better enable the reader to understand specific embodiments and the advantages thereof, reference to the following examples is suggested. It is intended that the specification and examples be considered as exemplary.
Oxygen Permeability Measurements
Unless specified, the apparent oxygen permeability (Dkapp), the apparent oxygen transmissibility (Dk/t), the intrinsic (or edge-corrected) oxygen permeability (Dki or Dkc) of a lens and a lens material are determined according to procedures described in Example 1 of U.S. Pat. Appl. Pub. No. 2012-0026457 A1.
Surface Wettability Tests
Water contact angle (WCA) on a contact lens is a general measure of the surface wettability of a contact lens. In particular, a low water contact angle corresponds to more wettable surface. The dynamic captive bubble contact angles of contact lenses are measured using a FDS instrument device from FDS Future Digital Scientific Corp. The FDS equipment is capable of measuring the advancing and receding contact angles. The measurement is performed on hydrated contact lenses at room temperature. A contact lens is removed from the vial and soaked in ˜40 mL fresh phosphate buffered saline (PBS) and shake for at least 30 minutes, then replace with fresh PBS, soak and shake for another 30 minutes unless otherwise specified. The contact lens is then put on a lens paper and dabbed to remove surface water prior to be placed on top of a lens holder with front curve up then screw the lens holder top on. Place the secure lens holder into the glass cell cuvette filled with filtered PBS. Place the glass cell cuvette onto the stage of the FDS instrument. Adjust the stage height and the syringe needle to dispense the air bubble to the lens surface. Repeat dispense/withdraw) 3 cycles for every lens to get the advancing and receding contact angles. The receding contact angles are reported in the examples below.
Water Break-Up Time (WBUT) Tests
The surface hydrophilicity of lenses (after autoclave) is assessed by determining the time required for the water film to start breaking on the lens surface. Lenses exhibiting WBUT 10 seconds are considered to have a hydrophilic surface and are expected to exhibit adequate wettability (ability to support the tear film) on-eye.
Lenses are prepared for water breakup measurement by removing the lens from its blister with soft plastic tweezers (Menicon) and placing the lens in a beaker containing phosphate buffered saline. The beaker contains at least 20 mL phosphate buffered saline per lens, with up to 3 lenses per beaker. Lenses are soaked for a minimum 30 minutes up to 24 hours before being transferred with soft plastic tweezers into a 96 well plastic tray with fresh phosphate buffered saline.
Water breakup time is measured at room temperature as follows: lenses are picked up with soft plastic tweezers as close to the edge of the lens as possible, base curve toward the measurer, taking care that the lens does not touch the sides of the well after being removed from the saline. As illustrated schematically in
Equilibrium Water Content
The equilibrium water content (EWC) of contact lenses are determined as follows.
Amount of water (expressed as percent by weight) present in a hydrated hydrogel contact lens, which is fully equilibrated in saline solution, is determined at room temperature. Quickly stack the lenses, and transfer the lens stack to the aluminum pan on the analytical balance after blotting lens in a cloth. The number of lenses for each sample pan is typically five (5). Record the pan plus hydrated weight of the lenses. Cover the pan with aluminum foil. Place pans in a laboratory oven at 100±2° C. to dry for 16-18 hours. Remove pan plus lenses from the oven and cool in a desiccator for at least 30 minutes. Remove a single pan from the desiccator, and discard the aluminum foil. Weigh the pan plus dried lens sample on an analytical balance. Repeat for all pans. The wet and dry weight of the lens samples can be calculated by subtracting the weight of the empty weigh pan.
Elastic Modulus
The elastic modulus of a contact lens is determined using a MTS insight instrument. The contact lens is first cut into a 3.12 mm wide strip using Precision Concept two stage cutter. Five thickness values are measured within 6.5 mm gauge length. The strip is mounted on the instrument grips and submerged in PBS (phosphate buffered saline) with the temperature controlled at 21±2° C. Typically 5N Load cell is used for the test. Constant force and speed is applied to the sample until the sample breaks. Force and displacement data are collected by the TestWorks software. The elastic modulus value is calculated by the TestWorks software which is the slope or tangent of the stress vs. strain curve near zero elongation, in the elastic deformation region.
Transmittance
Contact lenses are manually placed into a specially fabricated sample holder or the like which can maintain the shape of the lens as it would be when placing onto eye. This holder is then submerged into a 1 cm path-length quartz cell containing phosphate buffered saline (PBS, pH˜7.0-7.4) as the reference. A UV/visible spectrpohotmeter, such as, Varian Cary 3E UV-Visible Spectrophotometer with a LabSphere DRA-CA-302 beam splitter or the like, can be used in this measurement. Percent transmission spectra are collected at a wavelength range of 250-800 nm with % T values collected at 0.5 nm intervals. This data is transposed onto an Excel spreadsheet and used to determine if the lenses conform to Class 1 UV absorbance. Transmittance is calculated using the following equations:
in which Luminescence % T is the average % transmission between 380 and 780.
Chemicals
The following abbreviations are used in the following examples: NVP represents N-vinylpyrrolidone; DMA represents N,N-dimethylacrylamide; VMA represents N-vinyl-N-methyl acetamide; MMA represents methyl methacrylate; TEGDMA represent triethyleneglycol dimethacrylate; TEGDVE represents triethyleneglycol divinyl ether; EGMA represents ethylene glycol methyl ether methacrylate; VAZO 64 represents 2,2′-dimethyl-2,2′azodipropiononitrile; Nobloc is 2-[3-(2H-Benzotriazol-2-yl)-4-hydroxyphenyl]ethyl methacrylate from Aldrich; UV28 represents 2-{2′-Hydroxy-3′-tert-butyl-5′-[3′-methacryloyloxypropoxy]phenyl}-5-chloro-2H-benzotriazole; RB246 is Reactive Blue 246; RB247 is Reactive Blue 247; TAA represents tert-amyl alcohol; PrOH represents n-propanol; IPA represents isopropanol; DC 1173 represents Darocur 1173® photoinitiator; MeCN represents acetonitrile; SiGMA represents 3-(3-methacryloxy-2-hydroxypropyloxypropyl-bis(trimethylsiloxy)methylsilane; mSi1 represents monobutyl-terminated monomethacryloxypropyl-terminated polydimethylsiloxane (Mw˜600 to 800 g/mol from Gelest); mSi2 represents monobutyl-terminated monomethacryloxypropyl-terminated polydimethylsiloxane (Mw˜1100 g/mol from Gelest); D3 represents monobutyl-terminated monomethacryloxypropyl-terminated polydimethylsiloxane (Mw˜539 g/mol from Shin-Etsu); D6 represents monobutyl-terminated monomethacryloxypropyl-terminated polydimethylsiloxane (Mw˜761 g/mol from Shin-Etsu); D9 represents monobutyl-terminated monomethacryloxypropyl-terminated polydimethylsiloxane (Mw˜984 g/mol from Shin-Etsu); D7 represents monobutyl-terminated monomethacryloxypropyl-terminated polydimethylsiloxane (Mw˜750 g/mol from Shin-Etsu); D8 represents monobutyl-terminated monomethacryloxypropyl-terminated polydimethylsiloxane (Mw˜850 g/mol from Shin-Etsu); LM-CEPDMS represents a di-methacrylate-terminated chain-extended polydimethylsiloxane (Mn˜6000 g/mol), which has three polydimethylsiloxane (PDMS) segments linked via diurethane linkages between two PDMS segments and two urethane linkages each located between one terminal methacrylate group and one PDMS segment, is prepared according to method similar to what described in Example 2 of U.S. Pat. No. 8,529,057; CEPDMS represents a di-methacrylate-terminated chain-extended polydimethylsiloxane (Mn˜9000 g/mol), which has three polydimethylsiloxane (PDMS) segments linked via diurethane linkages between two PDMS segments and two urethane linkages each located between one terminal methacrylate group and one PDMS segment, is prepared according to method similar to what described in Example 2 of U.S. Pat. No. 8,529,057; Betacon represents a dimethacrylate-terminated chain-extended polydimethylsiloxane (Mn˜5000 g/mol), which has two polydimethylsiloxane (PDMS) segments separated by one perfluoropolyether (PFPE) via diurethane linkages between PDMS and PFPE segments and two urethane linkages each located between one terminal methacrylate group and one PDMS segment, is prepared according to method similar to what described in Example B-1 of U.S. Pat. No. 5,760,100; “GA” macromer represents a di-methacryloyloxypropyl-terminated polysiloxane (Mn˜6.8K g/mol, OH content˜1.2 meq/g) of formula (A) shown above; “G0” macromer represents a di-methacryloyloxypropyl-terminated polysiloxane (Mn˜8.0K g/mol, OH content˜1.8 meq/g) of formula (A) shown above; “G1” macromer represents a di-methacryloyloxypropyl-terminated polysiloxane (Mn˜10.7K g/mol, OH content˜1.8 meq/g) of formula (A) shown above; “G3” macromer represents a di-methacryloyloxypropyl-terminated polysiloxane (Mn˜16.3K g/mol, OH content˜1.8 meq/g) of formula (A) shown above; “G4” macromer represents a di-methacryloyloxypropyl-terminated polysiloxane (Mn˜13.5K g/mol, OH content 1.8 meq/g) of formula (A) shown above; “G5” macromer represents a di-methacryloyloxypropyl-terminated polysiloxane (Mn˜14.8K g/mol, OH content˜2.2 meq/g) of formula (A) shown above; “G6” macromer represents a di-methacryloyloxypropyl-terminated polysiloxane (Mn˜17.9K g/mol, OH content˜2.2 meq/g) of formula (A) shown above. All the di-methacryloyloxypropyl-terminated polysiloxane of formula (A) are prepared according to the procedures described in U.S. Pat. Appl. Pub. No. 2017-0166673 A1.
A lens formulation is purged with nitrogen at room temperature for 30 to 35 minutes. The N2-purged lens formulation is introduced into polypropylene molds and thermally cured in an oven under the following curing conditions: ramping from room temperature to a first temperature and then holding at the first temperature for a first curing time period; ramping from the first temperature to a second temperature and holding at the second temperature for a second curing time period; optionally ramping from the second temperature to a third temperature and holding at the third temperature for a third curing time period; and optionally ramping from the third temperature to a fourth temperature and holding at the fourth temperature for a fourth curing time period.
Lens molds are opened by using a demolding machine with a push pin. Lenses are pushed onto base curve molds with a push pin and then molds are separated into base curve mold halves and front curve mold halves. The base curve mold halves with a lens thereon are placed in an ultrasonic device (e.g., Dukane's single horn ultrasonic device). With a certain energe force, a dry state lens is released from mold. The dry state lens is loaded in a designed extraction tray. Alternatively, lenses can be removed from the base curve mold halves by floating off (i.e., soaking in an organic solvent (e.g., IPA) without ultrasonic. The lenses removed from the molds are subjected to an extraction process using water or an organic solvent or a mixture of solvents for at least 30 minutes. For example, extracted in 50% IPA for 30 min, or in 100% IPA for 15 min then back to 50% IPA for 30 min, DI water for 30 min and finally in PBS saline overnight. Inspected lens is packaged in lens packages containing a phosphate buffered saline (pH˜7.2) and autoclaved at 121° C. for about 30-45 minutes.
A lens formulation is purged with nitrogen at room temperature for 30 to 35 minutes. The N2-purged lens formulation is introduced into polypropylene molds and cured by UV/visible light (Hamamatsu lamp) for a curing time period. The post cast molding procedures described in Example 2 are used in this process for producing SiHy contact lenses.
In Examples 4 to 24, polymerizable compositions are prepared and listed in Tables 1-4. All the concentrations of the components listed in the tables are weight part units. The prepared polymerizable compositions comprises 0.01 weight part of a reactive dye (RB246 or RB247) and 0.5 weight part of free radical initiator (either VAZO 64 for thermally curable compositions or DC1173 for UV-curable compositions).
SiHy contact lenses are prepared from those polymerizable compositions according to curing processes described in Example 2 or 3. The lens properties of resultant SiHy contact lenses are determined according to procedure described in Example 1 and reported in Table 5.
As shown in Table 5, there are two limitations on the amounts of the siloxane-containing vinylic monomer, the linear polysiloxane vinylic crosslinker and the N-vinyl amide monomer in a polymerizable composition for forming inherently wettable SiHy contact lenses.
The first limitation appears to be that there is a threshold amount of the N-vinyl amide monomer relative to the total amount of all silicone-containing polymerizable components. That threshold value of the amount of the N-vinyl amide monomer is likely around 8.8 mmoles per gram of all the silicone-containing polymerizable components. In order to form inherently wettable SiHy contact lenses, a polymerizable composition should comprise about 8.8 mmoles or more per gram of all silicone-containing polymerizable components present in the polymerizable composition.
The second limitation appears to be that there is also a threshold value for the total amount of the H-donor moieties (“H-D”) contributed by the polysiloxane vinylic crosslinker and the siloxane-containing vinylic monomer relative to the amount of the N-vinyl amide monomer. That threshold value appears to be around 0.11 meqs of H-donor moieties per gram of the N-vinyl amide monomer. In order to form inherently wettable SiHy contact lenses, a polymerizable composition should comprise about 0.11 meqs or more of H-donor moieties (contributed from all the silicone-containing polymerizable components) per gram of the N-vinyl amide monomer.
In Examples 25 to 28, polymerizable compositions are prepared and listed in Table 6. All the concentrations of the components listed in the tables are weight part units. SiHy contact lenses are prepared from those polymerizable compositions according to curing processes described in Example 2 or 3. The lens properties of resultant SiHy contact lenses are determined according to procedure described in Example 1 and reported also in Table 6.
SiHy lenses of Example 13 have a round lens shape. The results of Example 13 and those in Table 6 shows that when a polymerizable composition comprises at least 5 weight part units of methyl methacrylate, the resultant SiHy lenses prepared from such a composition are inherently wettable and have a robusteness of lens shape.
All the publications, patents, and patent application publications, which have been cited herein above in this application, are hereby incorporated by reference in their entireties.
This application claims the benefit under 35 USC § 119 (e) of U.S. provisional application No. 62/516,205 filed 7 Jun. 2017, herein incorporated by reference in its entirety.
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