Patent ID: 8053489

Claim:
A polymer comprising the reaction product of two or more crosslink agents, a hydrophilic monomer and a lens monomer, wherein at least one of the crosslink agents is of general formula I wherein R 1 , R 2 , R 3 , R 4 , R 7 and R 8 are independently selected from hydrogen, C 1 -C 4 alkyl, C 1 -C 2 alkanol or hydroxyl; A is O, O(CH 2 CH 2 O) v or [SiR 5 R 6 O] w SiR 5 R 6 , wherein R 5 and R 6 are independently selected from methyl, ethyl or phenyl, and v is from 1-20 and w is from 0 to 60; D is a straight or branched alkyl with two to eight carbons or a cyclic hydrocarbon with five to eight ring carbons, wherein one or two of the alkyl or cyclic carbon atoms is optionally substituted for an oxygen atom, sulfur atom or nitrogen radical; and m and n are integers independently selected from 1 to 10; p is 0 or 1; and q is an integer from 0 to 6.