Patent ID: 8758828

Claim:
A copolymer having the formula: wherein n and m are each independent integers ranging from 1 to 10,000; wherein x is an integer ranging from 0 to 12; wherein each R 1a and each R 1b , when present, is independently hydrogen, hydroxy, amino, thio, halogen, substituted or unsubstituted C 1 -C 6 alkyl, substituted or unsubstituted C 1 -C 6 alkoxy, substituted or unsubstituted C 1 -C 6 alkylthio, substituted or unsubstituted C 1 -C 6 alkylamino, or substituted or unsubstituted C 1 -C 6 hydroxyalkyl; wherein R 2 is hydrogen, hydroxy, amino, thio, halogen, substituted or unsubstituted C 1 -C 6 alkyl, substituted or unsubstituted C 1 -C 6 alkoxy, substituted or unsubstituted C 1 -C 6 alkylthio, substituted or unsubstituted C 1 -C 6 alkylamino, or substituted or unsubstituted C 1 -C 6 hydroxyalkyl; wherein Q 1 is —COOH or and wherein Q 2 is —[(CH)CH 3 ]—, —(CH 2 )—, or —[(CH 2 ) 5 ]—.