Patent ID: 6673883
Filing Date: 2004-01-06
Classification: A61F,C08F

Abstract:
A cross-linkable polymer formed from monomers includinga) a hydroxyl-group containing monomer of the formula I in which R26 is hydrogen or a C1-4-alkyl group; A1 is â€”Oâ€” or â€”NR27â€” where R27 is hydrogen or a C1-4-alkyl group or a group B9Râ€”(OH)n; B9 is a bond, a straight or branched alkylene, oxa alkylene or oligooxa alkylene group; R13 is a n+1 functional C2-6 alkylene group, and n is an integer of one or more; b) a reactive monomer of the formula (II) in which R19 is hydrogen or a C1-4-alkyl group; A2 is â€”Oâ€” or â€”NR21â€” where R21 is hydrogen, or a C1-4-alkyl group R12 is a C1-24 straight or branched alkylene, oxaalkylene or oligo oxaalkylene group in which each alkylene group has 1 to 6 carbon atoms; A3 is a bond or â€”Oâ€”; and each R16 is independently selected from C1-6-alkyl groups; and c) a zwitterionic monomer of the formula (III) wherein B is a straight or branched alkylene, oxaalkylene or oligo-oxaalkylene chain optionally containing one or more fluorine atoms up to and including perfluorinated chains or, if X contains a carbonâ€”carbon chain between B and the zwitterionic moiety, a valence bond; X is a zwitterionic group R is hydrogen or a C1-C4 alkyl group; and A is â€”Oâ€” or â€”NR1â€” where R1 is hydrogen or a C1-C4 alkyl group or R1 is â€”Bâ€”X where B and X are as defined above.