Ophthalmic devices
View Patent ↗An ophthalmic device is disclosed that is a polymerization product of a monomeric mixture comprising: (a) a major amount of one or more non-silicone-containing hydrophilic monomers; (b) a crosslinking agent mixture comprising (i) one or more first crosslinking agents containing at least two ethylenically unsaturated reactive end groups, wherein the at least two ethylenically unsaturated reactive end groups are (meth)acrylate-containing reactive end groups and (ii) one or more second crosslinking agents containing at least two ethylenically unsaturated reactive end groups wherein at least one of the ethylenically unsaturated reactive end groups is a non-(meth)acrylate reactive end group, and (c) one or more hydrophilic polymers or copolymers comprising one or more hydrophilic units and a thio carbonyl thio fragment of a reversible addition fragmentation chain transfer (“RAFT”) agent wherein the ophthalmic device has an equilibrium water content of at least about 45 weight percent.
1. An ophthalmic device which is a polymerization product of a monomeric mixture comprising: (a) a major amount of one or more non-silicone-containing hydrophilic monomers, wherein the major amount of the one or more non-silicone-containing hydrophilic monomers present in the monomeric mixture is an amount greater than 50 weight percent, based on the total weight of the monomeric mixture; (b) a crosslinking agent mixture comprising (i) one or more first crosslinking agents containing at least two ethylenically unsaturated reactive end groups, wherein the at least two ethylenically unsaturated reactive end groups are (meth)acrylate-containing reactive end groups and (ii) one or more second crosslinking agents containing at least two ethylenically unsaturated reactive end groups wherein at least one of the ethylenically unsaturated reactive end groups is a non-(meth)acrylate reactive end group; and (c) one or more hydrophilic polymers or copolymers comprising one or more hydrophilic units and a thio carbonyl thio fragment of a reversible addition fragmentation chain transfer (“RAFT”) agent, wherein the ophthalmic device has an equilibrium water content of at least about 45 weight percent.
2. The ophthalmic device of claim 1 , wherein the one or more non-silicone-containing hydrophilic monomers is selected from the group consisting of an amide, cyclic lactam, hydroxyl-containing (meth)acrylate, poly(alkene glycols) functionalized with polymerizable groups and mixtures thereof.
3. The ophthalmic device of claim 2 , wherein the amide is selected from the group consisting of N,N-dimethyl acrylamide, N,N-dimethylmethacrylamide and mixtures thereof.
4. The ophthalmic device of claim 2 , wherein the cyclic lactam is selected from the group consisting of N-vinyl-2-pyrrolidone, N-vinyl caprolactam, N-vinyl-2-piperidone and mixtures thereof.
5. The ophthalmic device of claim 1 , wherein the one or more non-silicone-containing hydrophilic monomers is selected from the group consisting of N,N-dimethylacrylamide, N,N-dimethylmethacrylamide, N-vinyl-2-pyrrolidone, N-vinyl caprolactam, N-vinyl-2-piperidone, 2-hydroxyethyl methacrylate, N-(2-hydroxyethyl)methacryl amide, glyceryl methacrylate, N-methacryloyl glycine, (2-hydroxy-3-methacryloylpropyl)-4-methoxy phenylether and mixtures thereof.
6. The ophthalmic device of claim 1 , wherein the one or more first crosslinking agents are selected from the group consisting of an alkylene glycol-containing di(meth)acrylate crosslinking agent, an alkylene glycol-containing tri(meth)acrylate crosslinking agent, an alkylene glycol-containing tertra(meth)acrylate crosslinking agent and mixtures thereof.
7. The ophthalmic device of claim 6 , wherein the alkylene glycol di(meth)acrylate crosslinking agent is an ethylene glycol di(meth)acrylate having up to 10 ethylene glycol units.
8. The ophthalmic device of claim 1 , wherein the one or more second crosslinking agents are selected from the group consisting of a di(N-vinylcarbamate)-containing crosslinking agent, a di(N-allylcarbamate)-containing crosslinking agent, a di(O-vinylcarbamate)-containing crosslinking agent, a di(O-allylcarbamate)-containing crosslinking agent, a di(O-vinyl carbonate)-containing crosslinking agent, a di(O-allylcarbonate)-containing crosslinking agent, a tri(N-vinylcarbamate)-containing crosslinking agent, a tri(N-allyl carbamate)-containing crosslinking agent, a tri(O-vinylcarbamate)-containing crosslinking agent, a tri(O-allylcarbamate)-containing crosslinking agent, a tri(O-vinylcarbonate)-containing crosslinking agent, a tri(O-allylcarbonate)-containing crosslinking agent, a tetra(N-vinyl carbamate)-containing crosslinking agent, a tetra (N-allylcarbamate)-containing crosslinking agent, a tetra(O-vinylcarbamate)-containing crosslinking agent, a tetra(O-allylcarbamate)-containing crosslinking agent, a tetra(O-vinylcarbonate)-containing crosslinking agent, a tetra(O-allyl carbonate)-containing crosslinking agent, isocyanurate-containing crosslinking agent and mixtures thereof.
9. The ophthalmic device of claim 1 , wherein the one or more second crosslinking agents are selected from the group consisting of diethylene glycol bis(N-vinylcarbamate), diethylene glycol bis(N-allylcarbamate), diethylene glycol bis(O-vinylcarbamate), diethylene glycol bis(O-allylcarbamate), 1,4-butanediol bis(N-vinylcarbamate), ethylene glycol bis(O-vinyl carbonate), diethylene glycol bis(O-vinyl carbonate), 1,4-butanediol bis(O-vinyl carbonate), allyl methacrylate and mixtures thereof.
10. The ophthalmic device of claim 1 , wherein one or more first crosslinking agents are present in the monomeric mixture in an amount of about 0.1 to about 2.0 weight percent, based on the total weight of the monomeric mixture, and the one or more second crosslinking agents are present in the monomer monomeric mixture in an amount of about 0.05 to about 2.0 weight percent, based on the total weight of the monomeric mixture.
11. The ophthalmic device of claim 1 , wherein the thio carbonyl thio fragment of the hydrophilic polymer or copolymer is of a RAFT agent comprising a dithioester group, xanthate group, dithiocarbamate group or trithiocarbonate group.
12. The ophthalmic device of claim 1 , wherein the one or more hydrophilic units of the one or more hydrophilic polymers or copolymers are derived from one or more hydrophilic monomers selected from the group consisting of an unsaturated carboxylic acid, acrylamide, cyclic lactam, poly(alkyleneoxy)(meth)acrylate, (meth)acrylic acid, hydroxyl-containing-(meth)acrylate, hydrophilic vinyl carbonate, hydrophilic vinyl carbamate monomer, hydrophilic oxazolone monomer, and mixtures thereof.
13. The ophthalmic device of claim 1 , wherein the one or more hydrophilic polymers or copolymers have a number average molecular weight of at least about 30 kilo Daltons (kDa).
14. The ophthalmic device of claim 1 , wherein the one or more hydrophilic polymers or copolymers have a number average molecular weight of at least about 45 kDa.
15. The ophthalmic device of claim 1 , wherein the one or more hydrophilic polymers or copolymers have a number average molecular weight of at least about 60 kDa.
16. The ophthalmic device of claim 1 , wherein the one or more hydrophilic polymers or copolymers further comprise units derived from an ethylenically unsaturated polymerizable alkoxylated polymer selected from the group consisting of polyethylene glycol (PEG)-200 methacrylate, PEG-400 methacrylate, PEG-600 methacrylate, PEG-1000 methacrylate and mixtures thereof.
17. The ophthalmic device of claim 1 , wherein the monomeric mixture further comprises an ultraviolet (UV) blocker.
18. The ophthalmic device of claim 1 , having a captive bubble contact angle of from about 30° to about 70°.
19. The ophthalmic device of claim 1 , wherein the ophthalmic device is a contact lens.
20. The ophthalmic device of claim 1 , wherein the ophthalmic device is a hydrogel.
21. The ophthalmic device of claim 1 , wherein the monomeric mixture contains no silicone-containing monomer.
22. A method of making an ophthalmic device comprising
(a) providing a monomeric mixture comprising (i) a major amount of one or more non-silicone-containing hydrophilic monomers, wherein the major amount of the one or more non-silicone-containing hydrophilic monomers present in the monomeric mixture is an amount greater than 50 weight percent, based on the total weight of the monomeric mixture; (ii) a crosslinking agent mixture comprising (1) one or more first crosslinking agents containing at least two ethylenically unsaturated reactive end groups, wherein the at least two ethylenically unsaturated reactive end groups are (meth)acrylate-containing reactive end groups and (2) one or more second crosslinking agents containing at least two ethylenically unsaturated reactive end groups wherein at least one of the reactive end groups is a non-(meth)acrylate reactive end group; and (iii) one or more hydrophilic polymers or copolymers comprising one or more hydrophilic units and a thio carbonyl thio fragment of a RAFT agent;
(b) subjecting the monomeric mixture to polymerizing conditions to provide a polymerized device, and
(c) hydrating the polymerized device, wherein the ophthalmic device has an equilibrium water content of at least about 45 weight percent.
23. The method of claim 22 , wherein the monomeric mixture comprises about 0.1 to about 2.0 weight percent, based on the total weight of the monomeric mixture of the one or more first crosslinking agents and about 0.05 to about 2.0 weight percent, based on the total weight of the monomeric mixture, of the one or more second crosslinking agents.