Liquid crystal compounds

Details Liquid crystal compounds Liquid crystal compounds

Filed on

1989-06-27

Date issued

1991-10-29

Examiner

Maples, John S.

Patent Class

Compositions

SubClass

Liquid crystal compositions

SubSubClass

Containing nonsteryl liquid crystalline compound of...

Other Related Categories

25229901, 25229966, 25229967, 558431, C09K 1930, C09K 1952, C09K 1912, C07C25500

Type

Patent

Status

active

Patent number

050614002

Description

ABSTRACT:
2'-fluoro-4"-trans-cyclohexyl-terphenyl derivatives represented by the general formula: ##STR1## wherein the cyclohexyl is the trans isomer, R is a straight chain alkyl having from 1 to 12 carbon atoms, X is a straight chain alkyl having from 1 to 12 carbon atoms, a straight chain alkoxy having from 1 to 12 carbon atoms or --CN and the compounds exhibit the nematic phase. The fluoro-cyclohexyl-terphenyl derivatives have a low crystal-nematic phase transition temperature (C-N point), a high nematic phase-isotropic liquid phase transition temperature (N-I point) and low viscosity and may be included in liquid crystal compositions for improved display devices having a wide temperature range, a low driving voltage and a rapid response speed.

REFERENCES:
Chan, et al., Mol. Cryst. Liq. Cryst., 185, vol. 123, pp. 185-204.
Balkwill, et al., Mol. Cryst. Liq. Cryst., 1985, vol. 123, pp. 1-13.
Kelly, et al., Mol. Cryst. Liq. Cryst., 1984, vol. 110, pp. 239-261.
Kelly, et al., Helvetica Chimica Acta, 1985, vol. 68, pp. 1444-1452.
Fearon, et al., Mol. Cryst. Liq. Cryst., 1985, vol. 124, pp. 89-103.
Kelly, Helvetica Chimica Acta, vol. 67, 1984, pp. 1572-1579.
Kelly, et al., Helvetica Chimica Acta, vol. 68, 1985, pp. 813-817.

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