Mesomorphic compound, liquid crystal composition, liquid crystal

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

1991-05-20

1993-02-23

Lovering, Richard D.

Compositions

Liquid crystal compositions

Containing nonsteryl liquid crystalline compound of...

25229901, 25229961, 25229963, 25229966, 25229967, 359103, 359104, 544229, 544242, 544298, 544335, 556415, 556424, 556438, 556447, 560 59, 560 61, 560 62, 560 64, 560 65, 560 73, 560 76, 560102, C09K 1932, G02F 113, C07F 708

Patent

active

051887622

ABSTRACT:
A mesomorphic compound represented by the following formula (I): ##STR1## wherein R.sub.1 denotes a linear or branched alkyl group having 2-16 carbon atoms capable of including one or two non-neighboring methylene groups which can be replaced with ##STR2## and capable of including fluorine substituted for hydrogen; A denotes --A.sub.1 -- or --A.sub.1 --A.sub.2 -- and B denotes --B.sub.1 -- or --B.sub.1 --B.sub.2 -- wherein A.sub.1, A.sub.2, B.sub.1 and B.sub.2 respectively denote ##STR3## wherein Y.sub.1 and Y.sub.2 respectively denote H, F, Cl, Br, --CH.sub.3, --CN or --CF.sub.3 ; Z.sub.1 and Z.sub.2 respectively denote ##STR4## Z.sub.3 denotes ##STR5## R.sub.2, R.sub.3 and R.sub.4 respectively denote a linear or branched alkyl group having 1-16 carbon atoms including a methylene group which can be replaced with ##STR6## with proviso that it is not adjacent to the silicon atom; p and q are respectively 0 or 1 with proviso that p+q is 0 or 1; and n is an integer of 1-12. 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: 4316041 (1982-02-01), Totten et al.
patent: 4367924 (1983-01-01), Clark et al.
patent: 4774028 (1988-09-01), Imai et al.
patent: 5106530 (1992-04-01), Hass et al.
Schadt et al., "Applied Physics Letters," vol. 18, No. 4, pp. 127-128 (1971).

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