Patent ID: 8796405

Claim:
A polymer comprising units of the formula and salts thereof, wherein z is 0, 1, or 2, and R is H, a substituted or unsubstituted C 1 -C 18 alkyl, a substituted or unsubstituted C 2 -C 18 alkenyl, a substituted or unsubstituted C 2 -C 18 alkynyl, a substituted or unsubstituted C 3 -C 18 cycloalkyl, a substituted or unsubstituted C 1 -C 18 haloalkyl, a substituted or unsubstituted C 2 -C 18 heterocycloalkyl, a substituted or unsubstituted C 6 -C 18 aryl, a substituted or unsubstituted C 7 -C 18 arylalkylene, or a substituted or unsubstituted C 3 -C 18 heteroaryl, R′ is H or R′ together with R forms a substituted or unsubstituted C 2 -C 18 heterocycloalkyl, or substituted or unsubstituted C 2 -C 18 heteroaryl group, each having 5 to 8 ring members.