Patent ID: 6312706
Filing Date: 2001-11-06
Classification: C08F,C08G,G02C,Y10S

Abstract:
A hydrogel material that is the polymerization product of a comonomer mixture comprising:(a) a polysiloxane-containing urethane prepolymer endcapped with polymerizable ethylenically unsaturated organic radicals, wherein the polymerizable unsaturated organic radicals comprise radicals represented by the general chemical formula: ##STR14##whereinR.sup.1 denotes a divalent alkylene radical with 1 to 10 carbon atoms;R.sup.2 denotes a --H or --CH.sub.3 radical;R.sup.3 denotes a --H radical or an alkyl radical with 1 to 6 carbon atoms or a --COY--R.sup.4 radical where Y is --O--, --S-- or --NH-- and R.sup.4 denotes an alkyl radical with 1 to 12 carbon atoms;Z is --O-- or --NH--;X denotes --CO-- or --OCO--;Ar denotes an aromatic radical with 6 to 30 carbon atoms;w is 0 to 6; x is 0 or 1; y is 0 or 1; and z is 0 or 1;(b) tris(trimethylsiloxy)silylpropyl methacrylate in an amount effective to improve percent elongation of the hydrogel material; and(c) a hydrophilic comonomer selected from the group consisting of N-vinyl-2-pyrrolidinone, N,N-dimethylacrylamide, and mixtures thereof,said hydrogel material having oxygen permeability and mechanical properties suitable for hydrogel contact lens applications, and a water content of at least about 20 weight percent.