The invention is related to a method for producing silicone medical devices, in particular, silicone contact lenses, having consistent mechanical properties in a cost-effective manner. The invention is also related to a silicone medical device, especially a soft silicone contact lens.
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1. A method for producing a silicone medical device, comprising the steps of: (1) obtaining a polymerizable silicone composition which comprises (a) from about 65% to about 98.9% by weight of (i) one or more first polydiorganosiloxanes each having at least two (meth)acryloylamido groups, (ii) one or
1. A method for producing a silicone medical device, comprising the steps of: (1) obtaining a polymerizable silicone composition which comprises (a) from about 65% to about 98.9% by weight of (i) one or more first polydiorganosiloxanes each having at least two (meth)acryloylamido groups, (ii) one or more second polydiorganosiloxanes each having at least two (meth)acryloyloxy groups, or (iii) a mixture thereof, wherein each of the first and second polydiorganosiloxanes has an averaged molecular weight of at least about 2000 Daltons,(b) from about 1.0% to about 20.0% by weight of one or more third polydiorganosiloxanes each having at least two thiol groups and an averaged molecular weight of at least about 2000 Daltons, and(c) from about 0.1% to about 3% by weight of a free-radical initiator,provided that components (a) to (c) listed above and any additional polymerizable components present in the polymerizable silicone composition add up to 100% by weight;(2) introducing the polymerizable silicone composition into a mold for making a silicone medical device; and(3) curing thermally or actinically the polymerizable silicone composition in the mold to form the silicone medical device,wherein the formed silicone medical device has an elastic modulus of about 1.2 MPa or less and an elongation at break of about 200% or larger. 2. The method of claim 1, wherein the first, second, and third polydiorganosiloxanes independent of one another are a linear polydiorganosiloxane. 3. The method of claim 1, wherein the first, second, and third polydiorganosiloxanes independent of one another are a linear polydimethylsiloxane. 4. The method of claim 3, wherein the free-radical initiator is a thermal initiator. 5. The method of claim 3, wherein the free-radical initiator is a photoinitiator. 6. The method of claim 5, wherein the polymerizable silicone composition comprises a UV-absorbing vinylic monomer. 7. The method of claim 1, wherein the medical device is a silicone contact lens. 8. A medical device, comprising a crosslinked silicone material, wherein the crosslinked silicone material comprises: (a) repeating units of a first polydiorganosiloxane having at least two (meth)acryloyl groups; and (b) repeating units of a second polydiorganosiloxane having at least two thiol groups, wherein the medical device has an elastic modulus of about 1.2 MPa or less and an elongation at break of about 200% or larger. 9. The medical device of claim 8, wherein the first polydiorganosiloxane comprises at least two (meth)acryloylamido groups. 10. The medical device of claim 8, wherein the first polydiorganosiloxane comprises at least two (meth)acryloyloxy groups. 11. The medical device of claim 8, wherein the first polydiorganosiloxane comprises at least two (meth)acryloylamido groups, wherein the crosslinked silicone material further comprises repeating units of at least one third polydiorganosiloxane having at least two (meth)acryloyloxy groups. 12. The medical device of claim 8, wherein the first, second, and third polydiorganosiloxanes independent of one another are a linear polydiorganosiloxane. 13. The medical device of claim 8, wherein the first, second, and third polydiorganosiloxanes independent of one another are a linear polydimethylsiloxane. 14. The medical device of claim 8, wherein the medical device is a silicone intraocular lens or a silicone contact lens. 15. The medical device of claim 8, wherein the medical device is a silicone contact lens. 16. The medical device of claim 9, wherein the medical device is a silicone contact lens. 17. The medical device of claim 10, wherein the medical device is a silicone contact lens. 18. The medical device of claim 11, wherein the medical device is a silicone contact lens. 19. The medical device of claim 12, wherein the medical device is a silicone contact lens. 20. The medical device of claim 13, wherein the medical device is a silicone contact lens.
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