Amphiphilic polysiloxane prepolymers and uses thereof
First Claim
1. A partially ethylenically-functionalized polysiloxane, which is a mixture of reaction products obtained by reacting an ethylenically functionalizing vinylic monomer having a first reactive functional group with a linear functional polysiloxane compound having two terminal second reactive functional groups at a molar equivalent ratio, REquivalent, of from about 40% to about 97%, 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 (REquivalent)2×
- 100% by mole of a linear polysiloxane crosslinkers having two terminal ethylenically-unsaturated groups, 2×
REquivalent×
(1−
REquivalent)×
100% by mole of a polysiloxane vinylic monomer or macromer having one terminal second reactive functional group and one terminal ethylenically-unsaturated group, and (1−
REquivalent)×
(1−
REquivalent)×
100% by mole of unreacted linear polysiloxane compound with two terminal second reactive functional groups.
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Accused Products
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
6 Claims
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1. A partially ethylenically-functionalized polysiloxane, which is a mixture of reaction products obtained by reacting an ethylenically functionalizing vinylic monomer having a first reactive functional group with a linear functional polysiloxane compound having two terminal second reactive functional groups at a molar equivalent ratio, REquivalent, of from about 40% to about 97%, 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 (REquivalent)2×
- 100% by mole of a linear polysiloxane crosslinkers having two terminal ethylenically-unsaturated groups, 2×
REquivalent×
(1−
REquivalent)×
100% by mole of a polysiloxane vinylic monomer or macromer having one terminal second reactive functional group and one terminal ethylenically-unsaturated group, and (1−
REquivalent)×
(1−
REquivalent)×
100% by mole of unreacted linear polysiloxane compound with two terminal second reactive functional groups. - View Dependent Claims (2, 3, 4, 5, 6)
- 100% by mole of a linear polysiloxane crosslinkers having two terminal ethylenically-unsaturated groups, 2×
Specification