Liquid-crystalline biphenyl or terphenyl derivatives

Details Liquid-crystalline biphenyl or terphenyl derivatives Liquid-crystalline biphenyl or terphenyl derivatives

1982-04-16

1984-02-14

Torrence, Dolph H.

Compositions

Liquid crystal compositions

Containing nonsteryl liquid crystalline compound of...

260465F, C09K 334, C07C12175

Patent

active

044315643

ABSTRACT:
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.

REFERENCES:
patent: 3947375 (1976-03-01), Gray et al.

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