Patent ID: 7125500

Claim:
A polymerizable mesogenic composition comprising at least two components, wherein at least one component is a compound of formula I R 1 -MG-R 2 I wherein R 1 is halogen, CN, OCN, NCS, NO 2 or an alkyl radical with 1 to 30 C atoms which may be unsubstituted, mono- or polysubstituted by halogen or CN, optionally one or more non-adjacent CH 2 groups being replaced, in each case independently from one another, by —O—, —S—, —NH—, —N(CH 3 )—, —CO—, —COO—, —OCO—, —OCO—O—, —S—CO—, —CO—S—, —CH═CH— or —C≡C— in such a manner that oxygen atoms are not linked directly to one another, or alternatively has one of the meanings of R 2 or is P-(Sp-X) n —, P is a polymerizable group selected from CH 2 ═CW-COO—, WCH═CH—O—, CH 2 ═CH-Phenyl-(O) k — and with W being H, CH 3 or Cl and k being 0 or 1, Sp is a spacer group with 1 to 25 C atoms, X is —O—, —S—, —CO—, —COO—, —OCO—, —OCO—O—, —CO—NH—, —NH—CO—, —OCH 2 —, —CH 2 O—, —SCH 2 —, —CH 2 S—, —CH═CH—COO—, —OOC—CH═CH— or a single bond, n is 0 or 1, MG is a mesogenic group of formula II -(A 1 -Z) m -A 2 - II wherein Z is —O—, —S—, —CO—, —COO—, —OCO—, —CO—NH—, —NH—CO—, —CH 2 CH 2 —, —OCH 2 —, —CH 2 O—, —SCH 2 —, —CH 2 S—, —CH═CH—, —CH═CH—COO—, —OCO—CH═CH—, —C≡C— or a single bond, A 1 and A 2 are each independently 1,4-phenylene in which, in addition, one or more CH groups are optionally replaced by N; 1,4-cyclohexylene in which, in addition, one or two non-adjacent CH 2 groups are optionally replaced by O and/or S; 1,4-cyclohexenylene; 1,4-bicyclo(2,2,2)octylene; piperidine-1,4-diyl; naphthalene-2,6-diyl; decahydronaphthalene-2,6-diyl; or 1,2,3,4-tetrahydro-naphthalene-2,6-diyl; all these groups optionally being unsubstituted, mono- or polysubstituted with F, Cl, OH, CN, NO 2 or alkyl, alkoxy, alkylcarbonyl or alkoxycarbonyl groups having 1 to 7 C atoms wherein one or more H atoms may be substituted by F or Cl, and m is 1, 2 or 3, and R 2 is alkyl with 1 to 25 C atoms which may be unsubstituted, mono- or polysubstituted by halogen or CN, optionally one or more non-adjacent CH 2 groups being replaced, in each case independently from one another, by —O—, —S—, —NH—, —N(CH 3 )—, —CO—, —COO—, —OCO—, —OCO—O—, —S—CO—, —CO—S—, —CH═CH— or —C≡C— in such a manner that oxygen atoms are not linked directly to one another, and which is substituted with at least two identical or different groups P.