Mesomorphic compound, liquid crystal composition, liquid crystal

Details Mesomorphic compound, liquid crystal composition, liquid crystal Mesomorphic compound, liquid crystal composition, liquid crystal

1995-05-15

1997-11-11

Kelly, C. H.

Compositions

Liquid crystal compositions

Containing nonsteryl liquid crystalline compound of...

568659, 568660, 568661, C09K 1934, C09K 1930, C09K 1912, C07C 4100

Patent

active

056860200

ABSTRACT:
A mesomorphic compound represented by the following formula (I): ##STR1## wherein R.sub.1 denotes a linear or branched alkyl group having 1-18 carbon atoms capable of including one or non-neighboring two or more methylene groups which can be replaced with at least one species of ##STR2## with the proviso that X denotes O or S and Y denotes halogen; R.sub.2 denotes a linear or branched alkyl group having 1-18 carbon atoms; A, B and D independently denote ##STR3## wherein Z.sub.1 and Z.sub.2 independently denote hydrogen, halogen, --CH.sub.3, --CN or --CF.sub.3 ; E denotes --CH.sub.3, --CH.sub.2 F or --CF.sub.3 ; and f and g independently denote 0 or 1. The mesomorphic compound is effective for providing a ferroelectric liquid crystal composition showing an improved response speed and also effective for suppressing occurrence of reverse domain.

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Schadt, et al. "Voltage-Dependent Optical Activity of a Twisted Nematic Liquid Crystal," 18 Applied Physics Letters, No. 4, pp. 127-128 (Feb. 15, 1971).

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