Cyclohexane derivative

Details Cyclohexane derivative Cyclohexane derivative

1993-10-07

1995-01-17

Wu, Shean

Compositions

Liquid crystal compositions

Containing nonsteryl liquid crystalline compound of...

568656, 568661, 570127, C09K 1930, C07C 43225, C07C 1908

Patent

active

053823796

ABSTRACT:
A novel liquid crystal material having an alkenyl group at the end of the molecule, and having a low viscosity is provided. When the compound is added to a display element it is able to reduce the threshold voltage of the resulting display element. The compound is expressed by the formula (I), ##STR1## wherein X is a F atom, a trifluoromethyl group, a trifluoromethoxy group or a difluoromethoxy group, --A-- is 1,4-cyclohexylene or 1,4-phenylene, --B-- is 1,4-cyclohexylene, l is 0, 1 or 2, m is 0, 1 or 2, l+m.gtoreq.1, Z is --CH.sub.2 CH.sub.2 -- or single bond, n is an integer of 0 to 4, R is a H atom or a linear or branched alkyl group of 1-7C, and when R is an alkyl group, the double bond has a trans-configuration. The compounds of the present invention are suitable as liquid crystal material for STN display element, and further are chemically stable; hence it is possible to prepare a composition having a superior multiplex characteristic and capable of effecting a low voltage drive.

REFERENCES:
patent: 5032313 (1991-07-01), Goto et al.
patent: 5213710 (1993-05-01), Reiffenrath et al.
patent: 5230829 (1993-07-01), Bartmann et al.

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