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US 5,981,669 AGranted
Silicone-containing prepolymers and low water materials
AssigneeBausch & Lomb Incorporated
InventorsPaul L. Valint, Jr., Yu-Chin Lai, Edmond T. Quinn, Daniel M. Ammon, Jr.
Life of this patent
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Abstract
Low water silicone-containing elastomers are based on a hydroxy- or amino-terminated prepolymer derived from an ethylenically unsaturated silicon-containing monomer, and at least one monomer reactive with hydroxyl- or amino-functional radicals of the prepolymer. The elastomers are especially useful as contact lens materials.
Claims21
A thermoplastic elastomer which is the polymerization product of a monomer mixture comprising:
- (A) a hydroxy- or amino-terminated prepolymer prepared by reacting the following components:
- (a) at least 60 mole % of an ethylenically unsaturated silicon-containing monomer,
- (b) 2.5 to 20 mole % of an ethylenically unsaturated monomer containing a hydroxyl or amino radical,
- (c) 2.5 to 20 mole % of a chain transfer agent that provides the prepolymer with hydroxyl- or amino-functional radicals, and
- (d) 0 to 20 mole % of an ethylenically unsaturated monomer other than monomers (a), (b) or (c),
- the mole percent of components (a), (b), (c) and (d) being based on the total molar amount of said components;
- and
- (B) at least one monomer reactive with hydroxyl- or amino-functional radicals of the prepolymer.
5 more elements
Dependencies are inferred from the claim text.