Biomedical devices
View Patent ↗Biomedical devices such as silicone hydrogels formed from a polymerization product of a mixture comprising (a) a siloxane-containing homopolymer comprising one or more thio carbonyl thio fragments of a reversible addition fragmentation chain transfer (RAFT) agent; and (b) one or more biomedical device-forming monomers are disclosed.
1. A biomedical device comprising a polymerization product of a mixture comprising (a) a siloxane-containing homopolymer comprising a thio carbonyl thio fragments of a reversible addition fragmentation chain transfer (RAFT) agent; and (b) one or more biomedical device-forming comonomers, wherein the siloxane-containing homopolymer is of the general formula:
wherein L is a linking group, R 10 and R 11 are independently hydrogen, a straight or branched C 1 -C 30 alkyl group, a C 1 -C 30 fluoroalkyl group, a C 1 -C 20 ester-containing group, an alkyl ether group, cycloalkyl ether group, cycloalkenyl ether group, aryl ether group, arylalkyl ether group, a substituted or unsubstituted C 1 -C 30 alkoxy group, a substituted or unsubstituted C 3 -C 30 cycloalkyl group, a substituted or unsubstituted C 3 -C 30 cycloalkylalkyl group, a substituted or unsubstituted C 3 -C 30 cycloalkenyl group, a substituted or unsubstituted C 5 -C 30 aryl group, a substituted or unsubstituted C 5 -C 30 arylalkyl group, a substituted or unsubstituted C 5 -C 30 heteroaryl group, a substituted or unsubstituted C 3 -C 30 heterocyclic ring, a substituted or unsubstituted C 4 -C 30 heterocyclolalkyl group, a substituted or unsubstituted C 6 -C 30 heteroarylalkyl group, fluorine, a C 5 -C 30 fluoroaryl group, a siloxy group, or a hydroxyl group; n is from 2 to 100, and A is a thio carbonyl thio fragment of the RAFT agent.
2. The biomedical device of claim 1 , wherein the thio carbonyl thio fragments comprises a dithioester fragment, xanthate fragment, dithiocarbamate fragment or trithiocarbonate fragment.
3. The biomedical device of claim 1 , wherein R 10 are independently a straight or branched C 1 -C 30 alkyl group, R 11 is a siloxy group and A is independently a dithioester fragment, xanthate fragment, dithiocarbamate fragment or trithiocarbonate fragment.
4. The biomedical device of claim 1 , wherein the biomedical device-forming comonomer is a silicon-containing monomer.
5. The biomedical device of claim 4 , wherein the mixture further comprises a hydrophilic monomer, hydrophobic monomer or both.
6. The biomedical device of claim 1 , wherein the biomedical device-forming comonomer is a hydrophilic monomer or hydrophobic monomer.
7. The biomedical device of claim 1 , wherein the biomedical device-forming comonomer is a hydrophilic monomer selected from the group consisting of an unsaturated carboxylic acid, acrylamide, vinyl 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.
8. The biomedical device of claim 1 , wherein the biomedical device-forming comonomer is a hydrophilic monomer selected from the group consisting of methacrylic acid, acrylic acid, 2-hydroxyethylmethacrylate, 2-hydroxyethylacrylate, N-vinyl pyrrolidone, N-vinyl caprolactone, methacrylamide, N,N-dimethylacrylamide, ethylene glycol dimethacrylate and mixtures thereof.
9. The biomedical device of claim 1 , wherein the siloxane-containing homopolymer comprises about 0.1 to about 40 weight percent of the mixture and the biomedical device-forming comonomer comprises about 0.1 to about 90 weight percent of the mixture.
10. The biomedical device of claim 1 , wherein the mixture further comprises (c) a crosslinking agent.
11. The biomedical device of claim 1 , wherein the device is a contact lens.
12. The biomedical device of claim 11 , wherein the contact lens is a rigid gas permeable contact lens.
13. The biomedical device of claim 11 , wherein the contact lens is a soft contact lens.
14. The biomedical device of claim 11 , wherein the contact lens is a hydrogel contact lens.
15. The biomedical device of claim 1 , wherein the device is an intraocular lens.
16. The biomedical device of claim 1 , wherein the device is a corneal implant.
17. A silicone hydrogel contact lens comprising a hydrated polymerization product of a mixture comprising (a) a siloxane-containing homopolymer comprising a thio carbonyl thio fragments of a RAFT agent; and (b) a hydrophilic monomer, wherein the siloxane-containing homopolymer is of the general formula:
wherein L is a linking group, R 10 and R 11 are independently hydrogen, a straight or branched C 1 -C 30 alkyl group, a C 1 -C 30 fluoroalkyl group, a C 1 -C 20 ester-containing group, an alkyl ether group, cycloalkyl ether group, cycloalkenyl ether group, aryl ether group, arylalkyl ether group, a substituted or unsubstituted C 1 -C 30 alkoxy group, a substituted or unsubstituted C 3 -C 30 cycloalkyl group, a substituted or unsubstituted C 3 -C 30 cycloalkylalkyl group, a substituted or unsubstituted C 3 -C 30 cycloalkenyl group, a substituted or unsubstituted C 5 -C 30 aryl group, a substituted or unsubstituted C 5 -C 30 arylalkyl group, a substituted or unsubstituted C 5 -C 30 heteroaryl group, a substituted or unsubstituted C 3 -C 30 heterocyclic ring, a substituted or unsubstituted C 4 -C 30 heterocyclolalkyl group, a substituted or unsubstituted C 6 -C 30 heteroarylalkyl group, fluorine, a C 5 -C 30 fluoroaryl group, a siloxy group, or a hydroxyl group; n is from 2 to 100, and A is a thio carbonyl thio fragment of the RAFT agent.