Mesomorphic compound, liquid crystal composition, liquid crystal

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

1991-09-13

1993-06-08

Stoll, Robert L.

Compositions

Liquid crystal compositions

Containing nonsteryl liquid crystalline compound of...

25229963, 25229901, 25229967, 25229916, 546 14, 546284, 556413, 556416, 556417, 556418, 556437, 556438, 556453, 556454, 556456, 359103, 359104, C09K 1934, C07F 702, C07F 704, G02F 113

Patent

active

052176452

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 non-neighboring two methylene groups which can be replaced with --O--, --S--, --CO--, --COO-- or --OCO-- and capable of including a hydrogen atom which can be replaced with a fluorine atom; A denotes --A.sub.1 -- or --A.sub.1 --A.sub.2 --; B.sub.2 denotes --B.sub.3 -- or --B.sub.3 --B.sub.4 --; A.sub.1, A.sub.2, B.sub.1, B.sub.3 and B.sub.4 independently denote ##STR2## wherein Y.sub.1 and Y.sub.2 independently denote a hydrogen atom, F, Cl, Br, --CH.sub.3, --CN or --CF.sub.3, with the proviso that B.sub.1 can be a single bond; Z.sub.1 and Z.sub.2 independently denote a single bond, --COO--, --OCO--, --CH.sub.2 O-- or --OCH.sub.2 --; Z.sub.3 denotes --O--, --CO--, --COO-- or --OCO--; R.sub.2, R.sub.3 and R.sub.4 independently denote a linear or branched alkyl group having 1--16 carbon atoms capable of including one or two methylene groups, other than those directly connected to Si, which can be replaced with --O--, --COO-- or --OCO-- with the proviso that --O-- cannot directly be connected to --O--; 1 and m independently denote 0 or 1 with the proviso that 1+m.noteq.0; n is an integer of 1-12; and X and Q independently denote CH or N with the proviso that X and Q cannot be N simultaneously. 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: 4678283 (1987-07-01), Kreuzer et al.
patent: 4730904 (1988-03-01), Panluth et al.
patent: 5034151 (1991-07-01), Shinjo et al.
Schadt et al., "Applied Physics Letters", vol. 18, No. 4, p. 127 (1971).

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