Patent ID: 6960637

Claim:
A polymer, comprising: repeating units of the formula I: wherein the variables are defined as follows: a is an integer from 0 to 3, R 1 , R 2 , R 3 are identical or different and are selected independently from the group consisting of hydrogen, C 1 -C 20 -alkyl, C 1 -C 20 -alkyl containing one or more Si, N, P, O or S atoms, C 6 -C 30 -aryl, C 4 -C 14 -heteroaryl containing at least one S or N atom, —N(C 6 -C 14 -aryl) 2 , and Y 1 , wherein Y 1 may be identical or different and is selected from the group consisting of —CH═CH 2 , trans- CH═CH—C 6 H 5 , cis—CH═CH—C 6 H 5 , acryloyl, methacryloyl, methylstyryl, —O—CH═CH 2 , glycidyl, wherein Y 2 is selected from the group consisting of —CH═CH 2 , trans-CH═CH—C 6 H 5 , cis-CH═CH—C 6 H 5 , acryloyl, methacryloyl, methylstyryl, —O—CH═CH 2 , glycidyl, and one or more groups Y 1 or Y 2 may be crosslinked to one another.