Patent ID: 7232520

Claim:
A compound of the formula: and salts thereof, wherein the order of A, B and C may be random, block, or a combination of random and block; wherein 1 100 < ( p + n ) m < 100 1 and 1 500 < p n < 100 1 wherein A is selected from the group consisting of wherein B is selected from the group consisting of wherein C is A or modified A, wherein modified A is selected from the group consisting of wherein X is selected from the group consisting of SO 3 H, CH 2 CO 2 H, CH 2 CH(CO 2 H) 2 , CO 2 H, PO 3 H 2 , PO 2 H 2 , CH 2 PO 3 H 2 , CH 2 Cl, CH 2 NH 2 , CH 2 N [(CH 2 ) y CH 3 ] 2 wherein y is any integer from 0 to 18, CH 2 N + [(CH 2 ) y= CH 3 ] 3 D − wherein y= is any integer from 0 to 18 and D − is an anion, SO 2 NHR wherein R is polyethylenimine, and CH 2 NHR wherein R is polyethylenimine.