Polymerizable chain-extended polysiloxanes with pendant hydrophilic groups
First Claim
1. A soluble amphiphilic prepolymer, comprising two terminal ethylenically-unsaturated groups and at least two polysiloxane segments separated by an organic linkage having one or more dangling hydrophilic polymer chains, wherein the prepolymer is obtained by reacting a hydrophilic polymer having one sole terminal reactive functional group with a chain-extended polysiloxane crosslinker of formula (I), in the presence or absence of a coupling agent, to form the amphiphilic prepolymer having the dangling hydrophophilic chains,
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Abstract
The invention provide a class of chain-extended polysiloxane crosslinkers which comprises (1) at least two polylsiloxane segments, wherein each pair of adjacent polysiloxane segments is linked by one divalent organic radical which includes at least one pendant hydrophilic group (hydroxyl and/or carboxyl groups) or at least one dangling hydrophilic polymer chain and a di-thioether linkage —S-DR-S— in which DR is a divalent organic radical; and (2) two terminal ethylenically unsaturated groups. The present invention is also related to a polymer comprising crosslinking units derived from chain-extended polysiloxane crosslinker of the invention and to ophthalmic lenses comprising such a polymer.
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Citations
14 Claims
- 1. A soluble amphiphilic prepolymer, comprising two terminal ethylenically-unsaturated groups and at least two polysiloxane segments separated by an organic linkage having one or more dangling hydrophilic polymer chains, wherein the prepolymer is obtained by reacting a hydrophilic polymer having one sole terminal reactive functional group with a chain-extended polysiloxane crosslinker of formula (I), in the presence or absence of a coupling agent, to form the amphiphilic prepolymer having the dangling hydrophophilic chains,
Specification