Patent ID: 6939479

Claim:
A compound of formula I wherein M 1 and M 2 are independently of each other >C═CH-A 1 -(Z 1 -A 2 ) m -R, and one of M 1 and M 2 is optionally, CH 2 , NR 0 , O or S, M 3 is (CH 2 ) k wherein one CH 2 group is optionally replaced by NR 0 , O or S, k is 1, 2, 3 or 4, A 1 and A 2 are independently of each other: 1,4-phenylene in which, one or more CH groups are optionally replaced by N; 1,4-cyclohexylene in which one or two non-adjacent CH 2 groups are optionally replaced by O and/or S; 1,3-dioxolane-4,5-diyl; 1,4-cyclohexenylene; piperidine-1,4-diyl; 1,4-bicyclo-(2,2,2)-octylene; naphthalene-2,6-diyl decahydro-naphthalene- 2,6-diyl; 1,2,3,4-tetrahydronaphthalene-2,6-diyl; or indane-2,5-diyl; all these groups optionally being mono- or polysubstituted with L, L is halogen, CN, SCN, NO 2 , SF 5 or an alkyl, alkoxy, alkylcarbonyl or alkoxycarbonyl group with 1 to 4 C atoms, wherein one or more H atoms may be substituted with F or Cl, Z is in each case independently —O—, —S—, —CO—, —COO—, —OCO—, —CO—NR 0 —, —NR 0 —CO—, —CH 2 CH 2 —, —CF 2 CF 2 —, —CH 2 CF 2 —, —OCH 2 —, —CH 2 O—, —SCH 2 —, —CH 2 S—, —CF 2 O—, —OCF 2 —, —CH═CH—, —CF═CF—, —CH═CF—, —(CH 2 ) 4 —, —CH═CH—COO—, —OCO—CH═CH—, —OOC—CHR 00 —OOC—, —COO—CHR 00 —COO—, —C≡C— or a single bond, R 0 is H or alkyl with 1 to 4 C atoms, R 00 is straight chain or branched alkyl or alkoxy with 1 to 8 C atoms or phenyl that is optionally mono- or polysubstituted by L, m is 1 or 2, R is H, halogen, NO 2 , CN, SCN, SF 5 , straight chain, branched or cyclic alkyl with 1 to 25 C atoms wherein one or more CH 2 groups are optionally replaced by —O—, —S—, —CO—, —NR 0 —, —CH═CH—, or —C≡C—in such a manner that O and/or S atoms are not linked directly to one another, and wherein one or more H-atoms are optionally replaced by F, Cl or phenyl that is optionally mono- or polysubstituted by L, or P-(Sp-X) n —, P is a polymerizable group, Sp is a spacer group with 1 to 20 C atoms, X has one of the meanings of Z, and n is 0 or 1.