Patent ID: 8076432

Claim:
A copolymer produced by the process consisting of polymerizing (1) one or more olefinically unsaturated monomers selected from the group consisting of maleic acid, maleic anhydride, t-butylacrylamide, 2-acrylamido-2-methyl propane sulfonic acid (AMPS), vinyl acetate, vinyl cyclopropane, vinyl cyclopentane, vinyl cyclohexane, and any combination thereof and (2) at least one monomer comprising the formula IV wherein R 1 -R 4 and R 7 , independently, is selected from the group consisting of hydrogen, an alkyl group, a cycloalkyl group, a heteroalkyl group, a heterocycloalkyl group, an aryl group, a heteroaryl group, a protecting group, or a combination thereof, or R 2 and R 4 form a substituted or unsubstituted cycloalkyl group, wherein R 1 -R 4 and R 7 are not simultaneously hydrogen.