Mesomorphic compound, liquid crystal composition, liquid crystal

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

1991-05-24

1995-03-07

Wu, Shean

Compositions

Liquid crystal compositions

Containing nonsteryl liquid crystalline compound of...

25229901, 359103, 359104, 549 29, 549 59, 549 62, C09K 1934, C09K 1952, G02F 113, C07D33302

Patent

active

053955510

ABSTRACT:
A mesomorphic compound represented by the following formula (I): ##STR1## wherein R.sub.1 and R.sub.2 respectively denote a linear or branched alkyl group having 1-18 carbon atoms capable of including one or two or more non-neighboring methylene groups which can be replaced with ##STR2## wherein X denotes halogen; X.sub.1 and X.sub.2 respectively denote ##STR3## Z.sub.1 denotes ##STR4## A.sub.1 denotes a single bond, ##STR5## and Y.sub.1 and Y.sub.2 respectively denote H, F, Cl, Br, --CH.sub.3 or --CF.sub.3 with the proviso that Y.sub.1 and Y.sub.2 are not simultaneously H. The mesomorphic compound is effective for providing a ferroelectric liquid crystal composition showing an improved low-temperature operation characteristic and a decreased temperature-dependence of response speed.

REFERENCES:
patent: 4367924 (1983-01-01), Clark et al.
patent: 5034151 (1991-07-01), Shinjo et al.
patent: 5116530 (1992-05-01), Togano et al.
patent: 5118441 (1992-06-01), Mori et al.
Schadt et al., "Applied Physics Letters", vol. 18, No. 4, pp. 127-128 (1971).
Goodby et al., "Mol. Cryst. Liq. Cryst.", vol. 110, pp. 175-203 (1984).

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