Patent ID: 8114316

Claim:
A polymer of formula I wherein R 1 and R 2 are independently of each other H, halogen, optionally substituted aryl or heteroaryl, P-Sp-, P*-Sp- or straight chain, branched or cyclic alkyl with 1 to 20 C-atoms, which may be unsubstituted, mono- or poly-substituted by F, Cl, Br, I or CN, it being also possible for one or more non-adjacent CH 2 groups to be replaced, in each case independently from one another, by —O—, —S—, —NH—, —NR 0 —, —SiR 0 R 00 —, —CO—, —COO—, —OCO—, —O—CO—O—, —S—CO—, —CO—S—, —CX 1 ═CX 2 — or —C≡C— in such a manner that O and/or S atoms are not linked directly to one another, R 3 and R 4 independently of each other have one of the meanings of R 1 or denote) —Sn(R 0 ) 3 , —B(OR′)(OR″), —CH 2 Cl, —CHO, —CH═CH 2 or —SiR 0 R 00 R 000 , R 0 , R 00 , R 000 are independently of each other H, aryl or alkyl with 1 to 12 C-atoms, R′ and R″ are independently of each other H or alkyl with 1 to 12 C-atoms, or OR′ and OR″ together with the boron atom form a cyclic group having 2 to 10 C atoms, X 1 and X 2 are independently of each other H, F, Cl or CN, P is a polymerizable group, P* is a group that can be converted to or substituted by a polymerizable group P, Sp is a spacer group or a single bond, n is an integer greater than 1, wherein the recurring units can be identical or different and, in at least one recurring unit one or both of R 1 or R 2 are not H.