Carboxylic acid ester compound, liquid crystal material, liquid

Details Carboxylic acid ester compound, liquid crystal material, liquid Carboxylic acid ester compound, liquid crystal material, liquid

1993-04-14

1994-06-21

Wu, Shean

Compositions

Liquid crystal compositions

Containing nonsteryl liquid crystalline compound of...

25229901, 25229964, 25229965, 25229966, 25229967, 560127, 560138, 359103, C09K 1932, C09K 1952, C07C 6974, G02F 113

Patent

active

053226399

ABSTRACT:
The carboxylic acid ester compound of the invention is represented by the following formula [I]: ##STR1## wherein R is an alkyl group of 3-20 carbon atoms; n is 0 or 1; at least one of A.sup.1, A.sup.2 and A.sup.3 is a group having tetralin structure, and the residual groups of A.sup.1, A.sup.2 and A.sup.3 are each independently a group having specific aromatic cyclic structure such as a phenylene group and a biphenyl group; Y.sup.1 and Y.sup.2 are each independently a group selected from the group consisting of --COO--, --CH.sub.2 CH.sub.2 -- and --CH.sub.2 O--; Q.sup.1 is a group selected from the group consisting of --CH.sub.3, --CF.sub.3, --C.sub.2 H.sub.5 and --C.sub.2 F.sub.5 ; and q is an integer of 4 to 12.
This carboxylic acid ester compound may be used as an antiferroelectric liquid crystal material, and also be used as a liquid crystal composition by using other liquid crystal material in combination. A liquid crystal element which is formed by filling the carboxylic acid ester compound in a gap between two substrates opposite to each other shows excellent properties required for antiferroelectric liquid crystal elements, for example, high speed switching.

REFERENCES:
patent: 4846998 (1989-07-01), Pohl et al.
patent: 4985583 (1991-01-01), Eidenschink et al.
patent: 5246622 (1993-09-01), Shimizu et al.

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