Patent ID: 8431682

Claim:
A polymer of formula I wherein R 1-8 are independently of each other, in case of multiple occurrence independently of one another, H, halogen, optionally substituted aryl or heteroaryl, P-Sp-, P*-Sp-, or straight chain, branched or cyclic alkyl with 1 to 40 C-atoms, which is optionally mono- or polysubstituted by F, Cl, Br, I or CN, and wherein one or more non-adjacent CH 2 groups are optionally 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 0 and R 00 are independently of each other H, optionally substituted aryl or alkyl with 1 to 12 C-atoms, X 1 and X 2 are independently of each other H, F, Cl or CN, P is a polymerisable group, P* is a group that can be converted to or substituted by a polymerisable group P, Sp is a spacer group or a single bond, a, b, c and d are independently of each other 0, 1, 2 or 3, with a +b +c +d≧1, n is an integer >1, wherein the recurring units are identical or different, with the proviso that: a=b=c=1, d=0, R 1 and R 5 are different from H, and R 2 , R 3 , R 4 , R 6 are H, or a=b=c=d=1, R 1 and R 7 are different from H, and R 2 , R 3 , R 4 , R 5 , R 6 , R 8 are H.