Patent ID: 7597942

Claim:
Polymerisable LC material comprising the following components: A) at least one compound having a high birefringence selected of formula I wherein P is a polymerisable or reactive group, Sp is a spacer group or a single bond, A is in case of multiple occurrence independently of one another an aromatic or aliphatic 5- or 6-ring, or a group comprising two or three fused aromatic or aliphatic 5- or 6-rings, these rings optionally containing one or more hetero atoms selected from N, O and S, and optionally being substituted by one or more identical or different groups L 1 , Z is in case of multiple occurrence independently of one another —O—, —S—, —CO—, —COO—, —OCO—, —S—CO—, —CO—S—, —O—CO—O—, —CO—NR 0 —, —NR 0 —CO—, —OCH 2 —, —CH 2 O—, —SCH 2 —, —CH 2 S—, —CF 2 O—, —OCF 2 —, —CF 2 S—, —SCF 2 —, —CH 2 CH 2 —, —CF 2 CH 2 —, —CH 2 CF 2 —, —CF 2 CF 2 —, —CH═CR 0 —, —CH═CH—, —CH═CF—, —CY 1 ═CY 1 —, —C≡C—, —CH═CH—COO—, —OCO—CH═CH— or a single bond, R 0 , R 00 are independently of each other H or alkyl with 1 to 12 C-atoms, Y 1 , Y 2 are independently of each other H, F, Cl or CN, m1, m2 are independently of each other 0, 1 or 2, with m1+m2 ≦3, L 1 , L 2 are independently of each other F, Cl, Br, I, CN, NO 2 , P-Sp- or alkyl, alkoxy, alkylcarbonyl, alkoxycarbonyl, alkylcarbonlyoxy or alkoxycarbonyloxy with 1 to 12 C atoms, wherein one or more H atoms are optionally replaced by F or Cl, r1, r2 are independently of each other 0, 1, 2, 3 or 4, R 1 is H, halogen, CN, NO 2 , NCS, SF 5 , P-Sp- or straight chain or branched alkyl with 1 to 20 C-atoms that 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—, —NR 0 —, —SiR 0 R 00 —, —CO—, —COO—, —OCO—, —OCO—O—, —NR 0 —CO—, —CO—NR 0 —, —NR 0 —CO—NR 0 —, —S—CO—, —CO—S—, —CY 1 ═CY 2 — or —C≡C— in such a manner that O and/or S atoms are not linked directly to one another, wherein at least one compound of formula Ia wherein P and Sp are as defined in formula I, Z 0 is —COO—, —OCO— or a single bond, L 1a,1b,2a,2b are independently of each other F, Cl, CN, (O) a C b F c H 2b+1−c or COCH 3 , r1a, r1b, r2a, r2b are independently of each other 0 or 1, with at least one of r1a, r1b, r2a, r2b being 1, R 1a is Cl or optionally mono- or polyfluorinated straight-chain or branched alkyl with 1 to 6 C-atoms wherein one or two non-adjacent CH 2 -groups are optionally replaced by —O—, —S—, —CO—, —COO—, —OCO—, —OCO—O—, —S—CO— or —CO—S— in such a manner that O and/or S atoms are not linked directly to one another, a is 0 or 1, b is 1 or 2, c is 0, 1, 2, 3, 4 or 5, B) at least one polymerisable mesogenic compound having two or more polymerisable groups, C) at least one chiral compound having a high helical twisting power (HTP), D) optionally at least one monoreactive polymerisable compound having an enantiotropic nematic phase and a clearing point of 75° C. or higher, E) at least one dichroic photoinitiator.