Chiral compounds and their use as chiral dopants for producing cholesteric liquid crystal compositions

Abstract

Chiral dopants of the formula I Z1—Y1—(A1)m—Y2—M—Y3—X—Y4—(A2)n—Y5—Z2  I in which the variables have, independently of one another, the following meanings: A1 and A2 a spacer with a chain length of 1 to 30 carbon atoms; Y1 to Y5 a chemical bond, —O—, —S—, —C(═O)—, —C(═O)—O—, —O—C(═O)—, —CH═CH—C(═O)—O—, —O—C(═O)—O—, —C(═O)—N(R)— or —(R)N—C(═O)—, —CH2—O—, —O—CH2—, —CH═N—, —N═CH— or —N═N—; M a mesogenic group; R hydrogen, C1-C4-alkyl; Z1 and Z2 hydrogen, C1-C4-alkyl, a polymerizable group or a radical having a polymerizable group; x a dianhydrohexitol residue selected from the group consisting of dianhydrosorbitol, dianhydromannitol and dianhydroiditol; m/n 0 or 1, where the radicals Z1, Z2, Y1 to Y5, A1 and A2 can be identical or different, and at least one Z1 or Z2 radical is a polymerizable group or a radical having a polymerizable group, and their use as chiral dopants for producing cholesteric liquid crystal compositions which can be employed as UV filters in cosmetic and pharmaceutical preparations.

Dependencies are inferred from the claim text.