Patent ID: 8722826

Claim:
A biocompatible polymer comprising a copolymer having the formula: wherein: each of R 1 , R 2 , and R 4 is independently hydrogen or methyl; each R 3 independently includes a zwitterion group, a linker being a chain of 2-12 carbon atoms, and an ester or amide attachment to the acryl or methacryl group; the zwitterion group is of formula: -A 4 -R 3 N + (R 4 ) 2 —R 5 —V − , each of A 2 and A 3 is independently —O—, —S—, —NH— or a valence bond; W is —(CH 2 ) m1 + N(R 2 ) 3 ; each R 2 is independently hydrogen or C 1-4 alkyl; m1 is an integer selected from 1 to 4; A 4 is a valence bond, —O—, —S—, or —NH—; R 3 is alkanediyl, —C(O)alkylene-; —C(O)NHalkylene-, or, together with A 4 , a valence bond; each R 4 is independently hydrogen or alkyl of 1 to 4 carbon atoms, or each R 4 together with the nitrogen to which they are attached form a heterocyclic ring of 5 to 7 atoms; R 5 is alkanediyl of 1 to 20 carbon atoms, of 1 to 10 carbon atoms, or of 1 to 6 carbon atoms; V is a carboxylate, sulphonate, or monovalently charged phosphate diester anion; A 5 is a valence bond, —O—, —S—, or —NH—; R 16 is a valence bond, alkanediyl, —C(O)alkylene- or —C(O)NHalkylene, or, together with A 5 , a valence bond; each R 17 is independently hydrogen or alkyl of 1 to 4 carbon atoms, or each R 17 together with the nitrogen to which they are attached form a heterocyclic ring of 5 to 7 atoms; each R 5 is independently ethyl or methyl; each R 6 is independently a straight chain, branched, unsaturated, or cyclic hydrocarbon of one to sixteen carbon atoms; n is a mole fraction in a range from about 0.01 to about 0.75; m is a mole fraction in a range from about 0.1 to about 0.99; and o is a mole fraction in a range from about 0.1 to about 0.99; wherein m+n+o=1.