Dainippon Ink and Chemicals, Incorporated

Hitachi, Ltd.

Kawamura Institute of Chemical Research

Casio Computer Co., Ltd.

Dainippon and Chemicals, Inc.

Rodic Co., Ltd.

Dainippon Mk & Chemicals Inc.

Yutaka Fujita

Hisato Sato

Haruyoshi Takatsu

Masayuki Tazume

Yoshi Arai

Kiyohumi Takeuchi

Hiroyuki Ohnishi

Takasi Yamaki

Katsuhiko Morita

Tetsushi Yoshida

Kiyofumi Takeuchi

Kazuhisa Toriyama

Tamihito Nakagomi

Kazuo Kimura

Kunihiko Kotani

Masanao Ohzeki

A liquid crystal composition contains 60 to 80 parts by weight of liquid crystal compounds represented by the following general formulas (1)-(3): ##STR1## where X.sup.1 is CH.sub.3 CH.dbd.CHCH.sub.2 CH.sub.2 -- when Y.sup.1 is ##STR2## CH.sub.3 CH.dbd.CH-- or CH.sub.2 .dbd.CHCH.sub.2 CH.sub.2 -- when Y.sup.1 is ##STR3## and CH.sub.3 CH.dbd.CHCH.sub.2 CH.sub.2 -- when Y.sup.1 is ##STR4## and Z.sup.1 is alkoxy group having 1 to 5 carbon atoms when Y.sup.1 is ##STR5## and alkyl group having 1 to 5 carbon atoms when Y.sup.1 is ##STR6## where R.sup.1 is alkyl group having 3 or 4 carbon atoms, and ##STR7## where R.sup.2 is alkyl group having 1 to 5 carbon atoms, and R.sup.3 is alkoxy group having 1 to 5 carbon atoms; and 20 to 30 parts by weight of at least one liquid crystal compound represented by the following general formula: ##STR8## where X.sup.2 is CH.sub.3 CH.dbd.CH-- or CH.sub.3 CH.dbd.CHCH.sub.2 CH.sub.2 --. The composition contains at least 70 parts by weight of the liquid crystal compounds represented by formulas (1), (2) and (4).

Liquid crystal composition

A nematic liquid crystalline composition comprising

Nematic liquid crystalline composition

A 1,2-di[trans(equatorial-equatorial)cyclohexyl]-ethane derivative of the following general formula ##STR1## wherein R and R', independently from each other, represent a linear alkyl group having 1 to 10 carbon atoms.

Dicyclohexylethane derivatives

A 1-cyclohexyl-2-cyclohexylphenylethane derivative of the following general formula ##STR1## wherein R.sub.1 and R.sub.2, independently from each other, represent a linear alkyl group having 1 to 7 carbon atoms.

1-Cyclohexyl-2-cyclohexylphenylethane derivatives

A nematic liquid crystal composition composed of (i) at least one compound of the general formula ##STR1## wherein R.sub.1 represents n-C.sub.m H.sub.2m+1, R.sub.2 represents n-C.sub.q H.sub.2q+1 -O, and m and q are integers of 1 to 10, (ii) at least one compound selected from the group consisting of nematic liquid crystalline compounds having positive dielectric anisotropy and homologs thereof, and (iii) as an optional ingredient, at least one compound selected from the group consisting of nematic liquid crystalline compounds having negative dielectric anisotropy and homologs thereof. This liquid crystal composition is colorless and chemically stable and has superior multiplexing drive characteristics. These properties render it useful as a display element.

Nematic liquid crystals for display devices

Novel compounds of the formula ##STR1## wherein R represents a linear alkyl group containing 1 to 9 carbon atoms. When added to nematic liquid crystals for electro-optical display elements, these compounds enable the liquid crystals to be operated at low voltages.

3'-Chloro-4'-cyanophenyl 4-n-alkylbenzoates

A liquid crystalline composition comprising a nematic liquid crystalline substance and as an additive, a 1,8-diazo-bicyclo(5,4,0) undecene-7 alkyl ammonium salt of benzoic acid optionally having a substituent at the paraposition.

Liquid crystalline composition

A nematic liquid crystal composition comprising (I) 4-n-valeryloxy-4'-cyanobiphenyl, (II) 4-n-caproyloxy-4'-cyanobiphenyl and (III) 4'-cyanophenyl-4-n-heptylbenzoate, and either (IV) 4'-cyanophenyl-4-n-butylbenzoate or (V) 4'-cyanophenyl-4-n-nonylbenzoate, said composition having a crystal-nematic transition temperature of -40.degree. to -20.degree. C and a nematic-isotropic transition temperature of 50.degree. to 65.degree. C.

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Yokohama, Japan

Yutaka Fujita