Mesomorphic compound, liquid crystal composition containing same

Details Mesomorphic compound, liquid crystal composition containing same Mesomorphic compound, liquid crystal composition containing same

1990-07-06

1991-12-31

Stoll, Robert L.

Compositions

Liquid crystal compositions

Containing nonsteryl liquid crystalline compound of...

252 9901, 548136, 548142, 359103, 359104, C09K 1934, C09K 1952, G07D28512, G02F 113

Patent

active

050769618

ABSTRACT:
A mesomorphic compound represented by the following formula (I): ##STR1## wherein R.sup.1 and R.sup.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 at least one species of --Z--, ##STR2## --CH.dbd.CH-- and --C.tbd.C--, wherein Z denotes --O-- or --S-- and R.sup.3 denotes hydrogen or an alkyl group having 1-5 carbon atoms; A.sup.1 denotes ##STR3## and A.sup.2 denotes any one of ##STR4## 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: 4952699 (1990-08-01), Yong et al.
Gray, G. W. et al., "Liquid Crystals & Plastic Crystals", vol. 1, John Wiley & Sons, Inc., N.Y., pp. 142-143 (1974).
Dimitrowa, K. et al., J. Prakt, Chemie, vol. 322, No. 6, pp. 933-944 (1980).
N. Herdegger, Helvetica Chimica Acta., vol. 39 (1956) 505:13.
N. Herdegger, Helvetica Chimica Acta., vol. 40 (1957) 2428:33.
R. Tschesche, Chem. Ber., vol. III (1978) 3502:05.
The Merck Index, Tenth Edition (1983) 4190.
E. F. Gramsbergen, Physics Letters, vol. 97A, No. 5 (1983) 199-201.
D. Demus et al., Flussige Kristalle in Tabellen II (1984) 359:60.
P. B. Rasmussen et al., Bull. Soc. Chim. Fr., No. 1 (1985) 62:65.

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