Patent ID: 8409469

Claim:
Mesogenic system comprising a) a polymeric component, component A, obtained from polymerisation of a precursor comprising one or more mesogenic mono-reactive compounds, one or more di-reactive compounds, which optionally are also mesogenic compounds and optionally a photo-initiator and b) a low molecular weight component, component B, comprising (i) at least one compound of formula II wherein R 2 is H, F, CI, Br, I CN, NO 2 , NCS, SF 5 , SO 2 CF 3 or alkyl which is straight chain or branched, is unsubstituted, mono- or poly-substituted by F, CI, Br, I or CN, and in which one or more non-adjacent CH 2 groups are optionally replaced, in each case independently from one another, by —O—,—S—, —NH—, —NR 01 —, SiR 02 R 02 —, —CO—, —COO—, —OCO, —OCO—O—, —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, R 01 and R 02 are, independently of each other, H or alkyl with 1 to 12 C-atoms, Y 1 and Y 2 are independently F, CL or CN and one may be H, A 21 , A 22 and A 23 are, each independently of each other, whereby each of A 21 and A 22 may have the same or a different meaning if present twice, Z 21 and Z 22 are, each independently of each other, a single bond, —(CH 2 ) 4 )—, —CH 2 CH 2 —, —CF 2 —CF 2 —, —CF 2 —CH 2 —, —CH 2 —CF 2 —, —CH═CH—, —CF═CF—, —CF═CH—, —(CH 2 ) 3 O—, —O(CH 2 ) 3 —, —CH═CF—, —C≡C—, —CH 2 O—, —OCH 2 —, —CF 2 O—, —OCF 2 —, —CO—O— or —O—CO—, whereby each of Z 21 and Z 22 may have the same or a different meaning if present twice, X 2 is halogen, —CN, —NCS, —SF 5 , —SO 2 CF 3 , alkyl, alkenyl, alkenyloxy or alkylalkoxy or alkocy radical each mono- or polysubstituted by CN and/or halogen, L 21 and L 22 are, each independently of each other, H or F, and m is 0, 1 or 2, n is 0, 1, 2 or 3, o is 0, 1 or 2, and m+n+o is 3 or less, (ii) in which R 0 independently has the meaning given for R 2 in formula II and wherein n and m are independently 0 or 1, wherein n and m are, independently of each other 0 or 1, or a mixture thereof, and one or more chiral dopants, said system exhibiting a Blue Phase.