Patent ID: 8252878
Filing Date: 2012-08-28
Classification: C08F

Abstract:
1. A polymer obtained by copolymerizing a monomer mixture comprising (i) 5 to 40wt % of a hydrophilic monomer of the general formula (I) 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 carbon-carbon chain between B and the centre of permanent positive charge or if Y contains a terminal carbon atom bonded to B, a valence bond; X is a zwitterionic group and Y is an ethylenically unsaturated polymerisable group of the general formula (II) where: (ii) 5 to 40wt % of styrene or a substituted styrene; (iii) 10 to 89wt % of a monomer (a) or mixture of monomers a), b) etc, which when polymerised form a polymer having a calculated Tg as calculated using (iv) 0.5 to 10wt % of a monomer having a crosslinkable group wherein after crosslinking the polymer has (v) wherein monomer (i) is 2-methacryloyloxyethyl-2′-trimethylammoniumethyl phosphate inner salt, monomer (ii) is styrene, monomer (iii) comprises methyl methacrylate, butyl acrylate and hydroxybutyl acrylate and monomer (iv) is trimethoxysilyl propyl methacrylate.