Patent ID: 6420453
Filing Date: 2002-07-16
Classification: C07F,C08F,G02B

Abstract:
A contact lens material manufactured from a polymer formed by polymerizing monomers consisting essentially of:(a) at least 70% by weight diluent monomer consisting essentially of hydroxyethylmethacrylate; (b) 0.1 to 5% by weight of further polymer ingredients consisting only of crosslinking monomers and polymerization initiators and including at least 0.1% by weight of crosslinking monomer; and (c) at least 0.2% by weight of zwitterionic monomer of the formula (V): â€ƒwherein BB is a straight or branched C1-C6 alkylene chain optionally interrupted by one or more oxygen atoms: nn is from 1 to 12; R11 is H or a C1-C4 alkyl group; and YY is a zwitterionic group which is selected from the group consisting of VIC, VID and VIE: wherein mm is 1 to 4, nn is 1 to 12 and BB is a straight or branched C1-C6 alkylene chain optionally interrupted by one or more oxygen atoms.