Patent ID: 6284854
Filing Date: 2001-09-04
Classification: C07F,C08F

Abstract:
A non-crosslinked biocompatible polymer formed from an ethylenically unsaturated monomer consisting essentially of(a) a radical polymerisable ethylenically unsaturated zwitterionic monomer containing a zwitterionic group having formula (I):Y--B--X (I)whereinB is a straight or branched alkylene;Y is an ethylenically unsaturated polymerisable group ##STR12##wherein R is hydrogen or a C.sub.1 -C.sub.4 alkyl group;A is --O-- or --NR.sup.1 -- where R.sup.1 is hydrogen or a C.sub.1 -C.sub.4 alkyl group; andX is a zwitterionic group IVB ##STR13##where the groups R.sup.6 are the same or different and each is hydrogen or C.sub.14 alkyl and d is 2 to 4; and(b) a comonomer of formula (VI)Y.sup.1 --Q (VI)where Y.sup.1 is an ethylenically unsaturated polymerisable group ##STR14##where R.sup.14 is hydrogen or C.sub.1 -C.sub.4 alkyl,A' is --O-- or NR.sup.15 -- where R.sup.15 is hydrogen or a C.sub.1 -C.sub.4 alkyl group andQ is the hydrophobic group and is selected from the group consisting of C.sub.6-24 -alkyl groups;with a molar ratio of zwitterionic monomer to comonomer in a range 10:90 to 50:50.