Amphiphilic polysiloxane prepolymers and uses thereof
First Claim
1. A silicone hydrogel contact lens comprising a polymeric material which is a polymerization product of a lens-forming composition including:
- (1) an amphiphilic branched polysiloxane prepolymer, wherein the amphiphilic branched polysiloxane prepolymer is obtained by(i) polymerizing a polymerizable composition to obtain a mixture of amphiphilic branched polysiloxane copolymer, wherein the polymerizable composition comprises(a) a partially ethylenically-functionalized polysiloxane, wherein the partially ethylenically-functionalized polysiloxane is a mixture of reaction products obtained by reacting a first ethylenically functionalizing vinylic monomer having a first reactive functional group with a functional polysiloxane compound having two or more second reactive functional groups at a molar equivalent ratio, REquivalent, of from about 40% to about 95%, wherein each first reactive functional group reacts with one second reactive functional group in the presence or absence of a coupling agent to form a covalent bond or linkage, wherein the mixture of reaction product comprises at least one polysiloxane crosslinkers having at least two ethylenically unsaturated groups and at least one polysiloxane vinylic monomer or macromer having at least one second reactive functional group and at least one ethylenically unsaturated group,(b) at least one hydrophilic vinylic monomer,(c) optionally a hydrophobic vinylic monomer,(d) a chain transfer agent other than a RAFT agent, wherein the chain transfer agent optionally including a third reactive functional group, and(e) a free-radical initiator, and(ii) ethylenically functionalizing the amphiphilic branched polysiloxane copolymer by reacting it with a second ethylenically functionalizing vinylic monomer having a fourth reactive functional group which reacts with one second or third reactive functional group in the presence or absence of a coupling agent to form a covalent linkage, thereby forming the amphiphilic branched polysiloxane prepolymer; and
(2) less than 20% by weight of one or more vinylic monomers relative to the total amount of all polymerizable components in the lens-forming composition; and
(3) optionally a hydrophobic vinylic monomer.
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Abstract
The present invention provides an amphiphilic polysiloxane prepolymer which comprises hydrophilic monomeric units derived from at least one hydrophilic vinylic monomer, polysiloxane crosslinking units derived from at least one polysiloxane crosslinker having at least two terminal ethylenically-unsaturated groups, dangling polysiloxane chains each of which is terminated with one ethylenically unsaturated group, and chain-transfer units derived from a chain transfer agent other than a RAFT agent. A prepolymer of the invention is suitable for making hydrogel contact lenses. The present invention is also related to hydrogel contact lenses made from an amphiphilic polysiloxane prepolymer of the invention and to processes for preparing an amphiphilic polysiloxane prepolymer of the invention and for making silicone hydrogel contact lenses.
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Citations
16 Claims
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1. A silicone hydrogel contact lens comprising a polymeric material which is a polymerization product of a lens-forming composition including:
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(1) an amphiphilic branched polysiloxane prepolymer, wherein the amphiphilic branched polysiloxane prepolymer is obtained by (i) polymerizing a polymerizable composition to obtain a mixture of amphiphilic branched polysiloxane copolymer, wherein the polymerizable composition comprises (a) a partially ethylenically-functionalized polysiloxane, wherein the partially ethylenically-functionalized polysiloxane is a mixture of reaction products obtained by reacting a first ethylenically functionalizing vinylic monomer having a first reactive functional group with a functional polysiloxane compound having two or more second reactive functional groups at a molar equivalent ratio, REquivalent, of from about 40% to about 95%, wherein each first reactive functional group reacts with one second reactive functional group in the presence or absence of a coupling agent to form a covalent bond or linkage, wherein the mixture of reaction product comprises at least one polysiloxane crosslinkers having at least two ethylenically unsaturated groups and at least one polysiloxane vinylic monomer or macromer having at least one second reactive functional group and at least one ethylenically unsaturated group, (b) at least one hydrophilic vinylic monomer, (c) optionally a hydrophobic vinylic monomer, (d) a chain transfer agent other than a RAFT agent, wherein the chain transfer agent optionally including a third reactive functional group, and (e) a free-radical initiator, and (ii) ethylenically functionalizing the amphiphilic branched polysiloxane copolymer by reacting it with a second ethylenically functionalizing vinylic monomer having a fourth reactive functional group which reacts with one second or third reactive functional group in the presence or absence of a coupling agent to form a covalent linkage, thereby forming the amphiphilic branched polysiloxane prepolymer; and (2) less than 20% by weight of one or more vinylic monomers relative to the total amount of all polymerizable components in the lens-forming composition; and (3) optionally a hydrophobic vinylic monomer. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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Specification