Patent ID: 7465479

Claim:
A polymerizable compound of formula I wherein P is a polymerizable group CH 2 ═CW 1 —COO—, CH 2 ═CW 2 —O—, CH 3 —CH═CH—O—, or CH 2 ═CW 1 —CO—NH—, with W 1 being H, Cl, CN, phenyl or alkyl with 1 to 5 C-atoms, W 2 being H or alkyl with 1 to 5 C-atoms, and k is 0 or 1, Sp is a spacer group or a single bond, X is —O—, —S—, —OCH 2 —, —CH 2 O—, —CO—, —COO—, —OCO—, —OCO—O—, —CO—NR 0 —, —NR 0 —CO—, —OCH 2 —, —CH 2 O—, —SCH 2 —, —CH 2 S—, —CH═CH—COO—, —OOC—CH═CH— or a single bond, R is P-Sp-X, R 0 is H or alkyl with 1 to 4 C atoms, L is F, CF 3 , OCF 3 , OCHF 2 , or alkoxy with 2 to 7 C atoms, or alkylcarbonyl, alkoxycarbonyl or alkylcarbonyloxy with 2 to 7 C atoms, wherein one or more H atoms are optionally substituted by F, and r is 1, 2 or 3.