2-fluorobenzonitrile derivative

Details 2-fluorobenzonitrile derivative 2-fluorobenzonitrile derivative

1993-09-10

1994-12-06

Wu, Shean

Compositions

Liquid crystal compositions

Containing nonsteryl liquid crystalline compound of...

558411, 558425, C09K 1930, C07C25550

Patent

active

053708229

ABSTRACT:
A novel liquid crystal compound exhibiting a low driving voltage, a liquid crystal phase within a broad temperature range and a good compatibility with other known liquid crystal compounds at low temperatures is provided, which compound is expressed by the formula ##STR1## wherein R is H or a linear or branched alkyl group of 1-10C, X is H or F, and the vinyl group has a transconfiguration. This compound has a high dielectric anisotropy value for its relatively low viscosity and can drive liquid crystal display elements under a low voltage, and further exhibits a liquid crystal phase within a broad temperature range of about room temperature to about 200.degree. C., and exhibits a good compatibility with many other liquid crystalline compounds such as ester compounds, Schiff's base compounds, biphenyls, phenylcyclohexanes, heterocyclic compounds, fluorine compounds, etc., particularly a good compatibility at low temperatures, and hence can provide improved liquid crystal materials. Further, when the compound of the present invention is added as a component of liquid crystal materials, it is possible to notably broaden the use temperature range of liquid crystal compositions without raising the viscosity.

REFERENCES:
patent: 5055220 (1991-08-01), Uchida et al.
Patent Abstracts of Japan, vol. 016, No. 552 (C-1006), Nov. 20, 1992 & JP-A-04 210 669 (Dainippon Ink), Jul. 31, 1992.

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