Patent ID: RE43612

Claim:
A polymer of the formula: wherein X is methyl, OR or NR2 NR 2 ; R is selected from the group consisting of hydrogen, alkyl, alkenyl, alkynyl, cyclic, heterocyclic, aryl, and heteroaryl; each R′ is independently selected from the group consisting of hydrogen, C1-C6 C 1 -C 6 lower alkyl, C1-C6 C 1 -C 6 lower alkoxy, hydroxy, amino, alkylamino, dialkylamino, cyano, thiol, heteroaryl, aryl, phenyl, heterocyclic, carbocyclic, and halogen; n is an integer between 3 and 10,000; x is an integer between 1 5 and 10; y is an integer between 1 and 10; and salts thereof.