Patent ID: 7572644

Claim:
A hydrogel copolymer comprising repeat units represented by formulae (1) and (2): where X 1 is a single bond, O, S, a substituted or unsubstituted alkylene group of 1-20 carbon atoms, a substituted or unsubstituted heteroalkylene group of 1-20 carbon atoms, a substituted or unsubstituted alkenylene group of 2-20 carbon atoms, or a substituted or unsubstituted arylene group of 6-30 carbon atoms; R 1 , R 2 and R 3 are each independently a hydrogen atom, a halogen atom, a hydroxy group, a substituted or unsubstituted alkyl group of 1-20 carbon atoms, a substituted or unsubstituted alkoxy group of 1-20 carbon atoms, a substituted or unsubstituted alkenyl group of 1-20 carbon atoms, a substituted or unsubstituted aryl group of 6-30 carbon atoms, a substituted or unsubstituted aryloxy group of 6-30 carbon atoms, a substituted or unsubstituted heteroaryl group of 2-30 carbon atoms, or a substituted or unsubstituted heteroaryloxy group of 2-30 carbon atoms; and b is an integer from 10 to 100,000, where X 1 is a single bond, O, S, a substituted or unsubstituted alkylene group of 1-20 carbon atoms, a substituted or unsubstituted heteroalkylene group of 1-20 carbon atoms, a substituted or unsubstituted alkenylene group of 2-20 carbon atoms, a substituted or unsubstituted heteroalkenylene group of 2-20 carbon atoms, or a substituted or unsubstituted arylene group of 6-30 carbon atoms; R 5 is and d is an integer from 10 to 100,000.