Liquid-crystalline biphenyl or terphenyl derivatives
申请人:Chisso Corporation
公开号:US04431564A1
公开(公告)日:1984-02-14
New liquid crystal (l. c.) compounds having a positive dielectric anisotropy, 4"-(.beta.-alkyloxyethyl)-4-cyanobiphenyls and 4'-(.beta.-alkyloxyethyl)-4-cyanoterphenyls expressed by the general formula ##STR1## wherein R represents an alkyl group of 1.about.9C and n is 2 or 3; a process for preparing the same; and l.c. compositions containing at least one of the same, are provided. When the compounds are added to a l.c. having a nearly zero or negative anisotropy, a l.c. composition having a positive dielectric anisotropy can be obtained. The compounds have a greater optical anisotropy and a superior compatibility with other l.c. compounds.