Patent ID: 7807068

Claim:
A compound of formula I wherein: R a and R b are each, independently, P-Sp-, H, F, Cl, Br, I, —CN, —NCO, —NCS, —OCN, —SCN, SF 5 , or straight-chain or branched alkyl having 1 to 25 C atoms wherein one or more non-adjacent CH 2 groups are each optionally replaced, independently of one another, by-C(R 00 )═C(R 000 )—, —C≡C—, —N(R 00 )—, —O—, —S—, —CO—, —CO—O—, —O—CO—, —O—CO—O—in such a way that O and/or S atoms are not linked directly to one another, and wherein one or more H atoms are each optionally replaced by F, Cl, Br, I, CN or P-Sp-, and at least one of R a and R b is or contains a group P-Sp-; P is, in each case independently, a polymerizable group; Sp is, in each case independently, a spacer group or a single bond; R 00 and R 000 are each, independently of one another, H or alkyl having 1 to 12 C atoms; and L 1 and L 2 are each, independently of one another, H or F.