Patent ID: 7087701

Claim:
A polymer, comprising units having the formula wherein: Q 1 comprises at least one aryl or heteroaryl group; Q 2 comprises at least one aryl or heteroaryl group; X 1 is O bonded directly to an aryl carbon of Q 1; X 2 is O bonded directly to an aryl carbon of Q 2; Z is a linker comprising at least one —C(R 2 ) 2 )— group; Y is a single bond or a linker group; R 1 is independently at each occurrence H, a halogen, an alkyl group, a heteroalkyl group, an aryl group, or a heteroaryl group; R 2 is independently at each occurrence H, an alkyl group, or a heteroalkyl group; and R 3 is H or a crosslinkable group.