Liquid crystalline compounds

摘要

A liquid crystalline compound and its mixture is new. A liquid crystalline compound of formula A 1>-MG 1>(A 3>)-B 1>-MG 2>(A 4>)-A 2>(I) and its mixture is new; A 1>- A 4>H, methyl or 2-80C hydrocarbon in which at least one carbon atom is optionally replaced by a heteroatom selected from O, S or N and in which at least one hydrogen atom is optionally substituted by a substituent Y; Y : 1-20C alkyl, 2-20C aryl, 2-20C cycloalkyl, 2-20C (cyclo)alkenyl, 2-20C (cyclo)alkynyl, amino, cyano, epoxy, halogen, hydroxy, nitro or oxo; B 1>4-80C hydrocarbon in which at least one carbon atom is optionally replaced by a heteroatom selected from O, S or N and in which at least one hydrogen atom is optionally substituted by a substituent Y; MG 1>, MG 2>aromatic, non-aromatic carbocyclic or 1-80C heterocyclic ring system. provided that no two oxygen atoms are joined together and at least one of A 1>- A 4>includes a polymerizable group, at least one of MG 1>and MG 2>comprises at least two ring system and are identical, either A 1>and A 2>or A 3>and A 4>are different or at least three of A 1>- A 4>are different. Independent claims are also included for the following: (A) a liquid crystalline mixture comprising at least two components. At least one component comprises a compound of formula (I); (B) a liquid crystalline material comprising a compound of formula (I); and (C) an optical or electro-optical device comprising a compound of formula (I) in monomeric, polymeric or polymeric network form.