Patent ID: 6534559
Filing Date: 2003-03-18
Classification: A61L,G02B

Abstract:
A contact lens at least one surface of which comprises a hydrogel, the hydrogel having functional groups selected from the group consisting of hydroxyl groups, amino groups, and mixtures thereof, the surface having a coating effective amount of a carboxyl-functional polymer coupled thereto by a coupling effective amount of at least one coupling agent selected from the group consisting of carbodiimides, N,Nâ€²-carbonyldiimidazole, phosphoryl chloride, titanium tetrachloride, sulfuryl chloride fluoride, chlorosulfonyl isocyanate, phosphorus iodide, pyridinium salts of tributyl amine, phenyl dichlorophosphate, polyphosphate ester, chlorosilanes, a mixture of tributyl phosphorus and phenyl isocyanate, a mixture of alkyl chloroformates and triethyl amine, a mixture of 2-chloro-1,3,5-trinitrobenzene and pyridine, a mixture of methyl sulfuryl chloride and diethyl amine, and a mixture of triphenylphosphine, carbon tetrachloride and triethyl amine, which carboxyl-functional polymer is selected from the group consisting of poly(acrylic acid), poly(methacrylic acid), poly(maleic acid), poly(itaconic acid), block or random copolymers of methacrylic acid or acrylic acid, maleic acid, or itaconic acid with a reactive vinyl monomer, and mixtures thereof.