Claims
- 1. A bimodulus contact lens article comprising a rigid gas-permeable polymeric core section with a diameter of about 7 to about 11 mm and a soft edge section with a width of about 0.5 to about 4 mm attached annularly about said core section;
- said contact lens article characterized by said edge section comprising a crosslinked composition polymerized from a monomer mix including at least 15 weight percent of monomers represented by Formula I: ##STR7## wherein R.sub.1 is selected from: hydrogen and a methyl group, and R.sub.2 is selected from alkyl groups having from 1 to 8 carbon atoms, so long as R.sub.1 and R.sub.2 are not both methyl groups; and wherein said soft edge section is annularly attached to said core by an interpenetrating network of said crosslinked composition into said core section,
- wherein said crosslinked composition of said edge section has a modulus of from about 50 to 700 MPa and wherein the core section has a modulus of from about 1200 to 2300 MPa.
- 2. A contact lens article as set forth in claim 1 wherein said crosslinked composition of said edge section has a Tg less than about 80.degree. C.
- 3. A contact lens article as set forth in claim 1 wherein said crosslinked composition of said edge section has a Tg from about 20 to 80.degree. C.
- 4. A contact lens article as set forth in claim 1 wherein said crosslinked composition of said edge section has a Tg at about body temperature.
- 5. A contact lens article as set forth in claim 1 wherein said crosslinked compositions comprises less than 35 weight percent of the monomer represented by Formula I.
- 6. A contact lens article as set forth in claim 1 wherein the monomeric mix from which said crosslinked composition is polymerized comprises a dimethacrylate as a crosslinking agent.
- 7. A contact lens article as set forth in claim 1 wherein the monomeric mix from which said crosslinked composition is polymerized comprises from 5 to 25 weight percent of at least one of a fluoroalkylmethacrylate or fluoroalkyl itaconate.
- 8. A contact lens article as set forth in claim 1 wherein the monomeric mix from which said crosslinked composition is polymerized from comprises from 2 to 10 weight percent of methacrylic acid.
- 9. A contact lens article as set forth in claim 1 wherein the monomeric mix from which said crosslinked composition is polymerized from comprises from 5 to 25 weight percent of polyethyleneoxide methacrylate.
- 10. A contact lens article as set forth in claim 1 wherein said crosslinked composition of said edge section is non-water swellable.
- 11. A contact lens article as set forth in claim 1 wherein the homopolymer of the monomer represented by Formula I has a Tg of less than 80.degree. C.
- 12. A contact lens article as set forth in claim 1 wherein the homopolymer of the monomer represented by Formula I has a Tg of less than about 25.degree. C.
- 13. A contact lens article as set forth in claim 1 wherein R.sub.2 is an alkyl group having from 2 to 6 carbon atoms.
- 14. A contact lens article as set forth in claim 1 wherein the homopolymer of the monomer represented by Formula I comprises at least one of butyl methacrylate and butyl acrylate.
- 15. A contact lens article as set forth in claim 1 wherein said core section comprises a rigid gas-permeable polymeric material polymerized from a monomer mix including at least 5 weight percent of monomers represented by Formula II: ##STR8## wherein: R.sub.3 and R.sub.4 are independently selected from: hydrogen, methyl, and a group represented by Formula III: ##STR9## so long as if one of R.sub.3 or R.sub.4 is a group represented by Formula III, the other is hydrogen; and R.sub.5 and R.sub.6 are independently selected from: hydrogen, an alkyl group having form 1 to 12 carbon atoms, a fluoroalkyl group, and a siloxanyl group.
- 16. A contact lens as set forth in claim 15 wherein the monomer represented by Formula II is an itaconate.
- 17. A contact lens as set forth in claim 15 wherein the monomer mix from which said rigid gas-permeable polymeric material is polymerized includes at least 3 weight percent of monomers represented by Formula IV: ##STR10## wherein A and A' are independently selected from activated unsaturated radicals; R.sub.7 and R.sub.7' are independently selected from divalent hydrocarbon radicals having from 1 to 22 carbon atoms, and R.sub.8, R.sub.9, R.sub.10, R.sub.11, R.sub.12, and R.sub.13 are independently selected from: monovalent hydrocarbon radicals having from 1 to 12 carbon atoms, monovalent hydrocarbon radicals having from 1 to 12 carbon atoms and further including ether linkages, halogen-substituted monovalent hydrocarbon radicals having from 1 to 12 carbon atoms, and halogen-substituted monovalent hydrocarbon radicals having from 1 to 12 carbon atoms further including ether linkages; and
- n is a number averaging between about 15 and 50.
- 18. A contact lens article of claim 17 wherein the monomer mix from which said rigid gas-permeable polymeric material is polymerized comprises:
- (a) from about 5 to about 60 weight percent of the monomers represented by Formula II;
- (b) from about 3 to about 24 weight percent of the monomers represented by Formula IV; and
- (c) from about 1 to about 25 weight percent of a hydrophilic monomer.
Parent Case Info
This application claims benefit of provisional application No. 60/013,999 filed Mar. 25, 1996.
US Referenced Citations (17)
Foreign Referenced Citations (3)
Number |
Date |
Country |
0 345 994 A2 |
Dec 1989 |
EPX |
WO 9406621 |
Mar 1994 |
WOX |
WO 9429756 |
Dec 1994 |
WOX |