Mitsui Petrochemical Industries, Ltd.

Mitsui Chemicals, Inc.

Shinichi Nishiyama

Tooru Yamanaka

Hideo Yamaoka

Hideo Hama

Junichi Kawabata

Yuuichirou Tatsuki

Shoichi Miyakoshi

Toyoji Shimizu

Nobuyuki Doi

Takahiro Fujiyama

Katsuo Taniguchi

Chiho Tanaka

Tohru Yamada

Fujihisa Matsunaga

Yukari Sakai

Mitsuko Nagai

Toyotaro Maruyama

Toru Yamanaka

Toyozi Shimizu

Chiho Hirano

Yuichirou Tatsuki

Tohru Yamanaka

Yukio Miyachi

The liquid crystal composition of the invention contains at least two compounds represented by the following formula (A) and each having different structures, one or more methylene group in the alkylene group R,may be substituted with &mdash;O&mdash; groups, not less than 50% by weight, and has a transmitted light quantity I,satisfying the condition of 0.5&lE;I,&lE;0.50,

Liquid crystal compositions

There is provided a carboxylic acid compound represented by the following formulae (I) to (IV): ##STR1## a liquid crystal material consisting of the carboxylic acid ester compound, a liquid crystal composition comprising the carboxylic acid ester compound, and a liquid crystal element using the carboxylic acid ester compound. There can be obtained advantages such as low operating temperature, high speed switching, very small electric power consumption, and high-stable contrast.

Carboxylate compounds, liquid crystal materials, liquid crystal

Carboxylate compounds, liquid crystal materials liquid crystal

Disclosed is a liquid crystal material represented by the following formula [I]:

Liquid crystal material, liquid crystal composition and liquid crystal

An antiferroelectric liquid crystal composite material comprising an organic polymer and an antiferroelectric liquid crystal material, both being in the dispersed state; a process for preparing a liquid crystal element including a step of mixing an organic polymer and an antiferroelectric liquid crystal material; and a liquid crystal element having such a structure that the above-mentioned antiferroelectric liquid crystal composite material is sandwiched between a pair of electrodes are provided. According to the present invention, there can be obtained a liquid crystal element which is available at a low price, quick in the electrooptical response, free from occurrence of switching failure and is able to make a large display screen.

Antiferroelectric liquid crystal composite material, process for

In accordance with the present invention, there are provided carboxylate compounds represented by the following formula [A] and liquid crystal material comprising said compounds ##STR1## wherein R is a group selected from the group consisting of alkyl, alkoxy and halogenated alkyl group of 3-20 carbon atoms, X and Y represent each a group selected from the group consisting of --COO--, --OCO--, --CH.sub.2 CH.sub.2 --, --CH.sub.2 O--, --OCH.sub.2 --, --S--S--, ##STR2## or a single bond, A and B represent each a group selected from the group consisting of specific divalent aromatic and alicyclic group such as phenylene, cyclohexylene and tetrahydronaphthalene and R* is an optically active group of 4-20 carbon atoms containing at least one asymmetric carbon atom (hydrogen atoms attached to the carbon atoms of said optically active group may be substituted with halogen atoms), and m and n are each an integer of 0-2, with the proviso that both m and n do not become 0 at the same time.

Carboxylate compounds, liquid crystal compositions and liquid crystal

The liquid crystal composition of the present invention comprises 1-99 wt. % of an antiferroelectric liquid crystal compound such as a compound represented by the following formula [A-8] and 99-1 wt. % of a cholesteric liquid crystal compound such as a compound represented by the following formula [B-2]. ##STR1## By the use of the liquid crystal composition of the invention, a liquid crystal element improved in liquid crystal properties such as contrast can be prepared.

Liquid crystal composition, liquid crystal element and process for the

The present invention provides a tetralin compound represented by the following formula:

Tetralin compound, liquid crystal material, liquid crystal composition

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.

Carboxylic acid ester compound, liquid crystal material, liquid crystal

In accordance with the present invention, there are provided carboxylate compounds and liquid compositions thereof represented by the following formula (A) ##STR1## wherein R.sup.1 represents one group selected from the group consisting of alkyl group having 6 to 18 carbon atoms, alkoxy group having 6 to 18 carbon atoms and halogenated alkyl group of 6 to 18 carbon atoms, C* represents an asymmetric carbon atom, and R.sup.2 represents a group represented by the following formula (A)--(CH.sub.2).sub.m --CH.sub.3 or (B)--(CH.sub.2).sub.n --COOR.sub.3 wherein m represents an integer of 2 to 6, n represents an integer of 0 to 5, and R.sup.3 represents alkyl group having 1 to 10 carbon atoms.

Carboxylate compounds, liquid crystal compositions containing said

The liquid crystal racemic mixture of the invention is represented by the formula [I]:

Liquid crystal racemic mixture, liquid crystal composition and liquid

This invention relates to carboxylic acid ester compounds or liquid crystal compounds represented by the following formula [A], liquid crystal compositions and liquid crystal elements using these compounds, the method of producing said liquid crystal elements, and other uses. ##STR1## wherein R represents one radical selected from the group consisting of an alkyl group having 6-18 carbon atoms, an alkoxy group having 6-18 carbon atoms, and a halogenated alkyl group having 6-18 carbon atoms, X represents --CF.sub.3 or --CH.sub.2 --CH.sub.3, m is an integral number of 1-10 when X is --CF.sub.3, and an integral number of 2-10 when X is --CH.sub.2 --CH.sub.3, and C* represents an asymmetric carbon atom.

Carboxylic acid ester compounds, and their related matters and method of

A naphthalene compound having the following formula (I) and a liquid crystal composition containing the same: ##STR1## wherein X represents a hydrogen atom or a halogen atom, Y and Z independently represent a monovalent group selected from the group consisting of ##STR2## wherein W represents a hydrogen atom or a halogen atom, R represents an alkyl group having 6 to 18 carbon atoms, provided that Y and/or Z represent the alkyl group, which is an optically active group including an asymmetric carbon having the following formula (II): ##STR3## wherein A is a group or atom selected from the group consisting of alkyl groups, alkoxy groups, halogen atoms and fluoroalkyl groups, n is an integer of 0 to 3, m is an integer of 3 to 6, and *C represents an asymmetric carbon.

Naphthalene compound and liquid crystal composition containing the same

In accordance with the present invention, there is provided substituted naphthalene compounds represented by the following formula [I]. ##STR1## wherein R.sup.1 represents alkyl of 1-18 carbon atoms, R.sup.2 represents alkyl of 1-18 carbon atoms, X is a group represented by --OCH.sub.2 -- or --CH.sub.2 CH.sub.2 --, and n is 0 or 1. In accordance with the invention, moreover, there is provided liquid crystal compositions containing the substituted naphthalene compounds represented by the above-mentioned formula [I].

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Sodegaura, Japan

Shinichi Nishiyama