Citizen Watch Company, Ltd.

Asahi Denka Kogyo Kabushiki Kaisha

Toshiro Yukinari

Tomijiro Naito

Toshihiro Shibata

Masaki Kimura

Yumiko Sakamaki

Yumiko Sato

Yukari Shinada

An ester derivative represented by the following formula (I). ##STR1## In the formula, V, W, X, Y and Z represent a hydrogen atom or a halogen atom, respectively. The present invention also comprises a liquid crystal composition containing the ester derivative. The ester derivative can optimize the n value, lower the viscosity and reduce the threshold voltage Vth of the liquid crystal composition.

Ester derivatives

A nematic liquid crystal composition comprising at least one member selected from 4-alkyl- or 4-alkoxy-benzoic acids represented by the following general formula (I) , particularly a nematic liquid crystal composition comprising a carboxylic acid mixture composed of at least one member selected from 4-alkyl- or 4-alkoxy-benzoic acids represented by the following general formula (I) and at least one member selected from 4-alkylcyclohexanecarboxylic acids represented by the following general formula (IV): ##STR1## wherein R.sub.1 stands for an alkyl or alkoxy group having 1 to 12 carbon atoms and R.sub.4 stands for an alkyl group having 1 to 12 carbon atoms.

Liquid crystal composition

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Yamanashi, Japan

Toshiro Yukinari