ARYL CYANOBENZOATES HAVING NEMATIC LIQUID CRYSTAL PROPERTIES NEMATIC LIQUID CRYSTAL MATERIALS AND ELECTRO-OPTICAL DISPLAY DEVICES PROVIDED THEREWITH

摘要

1406363 Liquid crystal compositions SUWA SEIKOSHA KK 26 June 1973 [13 July 1972] 30238/73 Heading C4X [Also in Divisions H4 and C2] A nematic liquid crystal material comprises, in admixture, a compound of the formula wherein R is an alkyl, alkoxy or acyloxy group, and at least one other nematic liquid crystal compound. Preferably, at least one other nematic liquid crystal compound that has negative dielectric anisotropy. Specified other nematic liquid crystal compounds are 4-methoxy- or -ethoxy-benzylidene-4SP1/SP-n-butylaniline, 4-(4SP1/SP- methoxy- or -ethoxyphenylazo)phenylbutane and 4 - (4SP1/SP - n - propylphenylazo)phenylheptanoate. Examples of particular liquid crystal compositions are given. The compositions may be used in electro-optical display devices.