Patent ID: 7172823

Claim:
A polymer represented by formula 1: wherein: Ar is selected from the group consisting of a substituted or unsubstituted C 6-30 aryl group and a substituted or unsubstituted C 2-30 heteroaryl group; R 1 , R 2 , R 3 and R 4 are independently a hydrogen atom, a substituted or unsubstituted C 1-30 alkyl group, a substituted or unsubstituted C 1-30 alkoxy group, a substituted or unsubstituted C 6-30 aryl group, a substituted or unsubstituted C 6-30 arylalkyl group, a substituted or unsubstituted C 6-30 aryloxy group, a substituted or unsubstituted C 2-30 heteroaryl group, a substituted or unsubstituted C 2-30 heteroarylalkyl group, a substituted or unsubstituted C 2-30 heteroaryloxy group, a substituted or unsubstituted C 5-20 cycloalkyl group, and a substituted or unsubstituted C 5-30 heterocycloalkyl group; n is a real number between 0.01 and 0.99; and the polymer has a weight average molecular weight within the range of from about 10,000 to about 200,000 and a molecular weight distribution of 1.5 to 5.