Patent ID: 7741375

Claim:
A polymer comprising two or more repeat units selected from the group consisting of: a repeat unit of the formula (Formula III): a repeat unit of the formula (Formula IV): combinations thereof; wherein: each X independently represents NR 5 , CR 5 R 6 , SiR 5 R 6 , S, a sulfur-bonded group, a phosphorus-bonded group, or each Y independently represents O, NR 5 , CR 5 R 6 , SiR 5 R 6 , S, a sulfur-bonded group, a phosphorus-bonded group, or each n is independently from 0 to 5; each R 1 independently represents an organic group; each R 2 , R 3 , R 4 , R 5 , and R 6 independently represents H or an organic group; and R 1 , R 2 , R 3 , R 4 , R 5 , and/or R 6 can optionally be joined to each other to form one or more rings.