Patent ID: 7642328
Filing Date: 2010-01-05
Classification: C08F

Abstract:
1. A pH sensitive macromer based copolymer having a general formula wherein A is an oligomeric lactide macromer selected from the group consisting of oligo (lactide) acrylate and oligo (lactide) methacrylate and having a degree of polymerization of from 4 to 12; B is a basic monomer wherein the basic monomer is an alkenyl pyridine selected from the group consisting of 2 vinyl pyridine, 3-vinyl pyridine, 4-vinyl pyridine and 5-vinyl 2 picoline, 2-vinyl 4 picoline, 2 isopropenyl pyridine and 3 isopropenyl pyridine; x is from 2 to 6; y is from 5 to 50; and n is from 3 to 13, wherein the copolymer has a molecular is from 900 to 8000, wherein a molecular weight of oligomeric lactide macromer is from 500 to 2000, and wherein the copolymer is soluble in an aqueous medium at a pH≦3.