A novel liquid crystal compound represented by the general formula (I): ##STR1## (wherein R is a straight or branched alkyl or alkoxy group having 1 to 20 carbon atoms, R* is an optically active alkyl group having 4 to 20 carbon atoms, X is a fluorine atom or a chlorine atom, and n is 1 or 2), a liquid crystal composition containing at least one liquid crystal compound of the general formula (I), a chiral smectic liquid crystal composition containing at least one liquid crystal compound of the general formula (I), and an optical switching element utilizing the chiral smectic liquid crystal composition containing at least one liquid crystal compound of the general formula (I) are described.
Liquid crystal compound having methyleneoxy group and composition containing same
申请人:Chisso Corporation
公开号:EP0174191A1
公开(公告)日:1986-03-12
A novel chiral liquid crystal compound having an optically active group which affords a superior response rate when used as a liquid crystal display element, and a liquid crystal composition containing the same are provided, which chiral liquid crystal compound is expressed by the formula
wherein R represents an alkyl group of 1 to 18 carbon atoms; R* represents an optically active alkyl group of 4 to 15 carbon atoms; X represents single bond,
represents -CH20- or -OCH2-; Z represents single bond,
and m and n each represent 1 or 2.
本发明提供了一种新型手性液晶化合物(具有光学活性基团,用作液晶显示元件时响应速度更快)和一种含有该化合物的液晶组合物,其手性液晶化合物的表达式为
其中 R 代表 1 至 18 个碳原子的烷基;R* 代表 4 至 15 个碳原子的光学活性烷基;X 代表单键、
代表-CH20-或-OCH2-; Z代表单键、
以及 m 和 n 分别代表 1 或 2。
Halogenen-substituted phenyl benzyl ether derivatives, liquid crystal compositions containing them and optical switching element