Mitsui Chemicals, Inc.

Toyotaro Maruyama

Takahiro Fujiyama

Yukari Sakai

Shigekazu Matsui

Shinichi Nishiyama

Koji Kawaai

Hiroaki Tan

Yasuhiko Suzuki

Chiho Hirano

Tsuneaki Koike

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

The invention to provide novel tetralin compounds, liquid crystal materials and liquid crystal compositions, which can constitute a liquid crystal element affording a wide operating temperature range, a high switching speed and a small consumption of electric power as well as a stable contrast. The tetralin compound of the invention is represented by the following formula [I] ##STR1## wherein R.sup.1 is an alkyl group or a polyfluoroalkyl group of 3-20 carbon atoms (wherein one --CH.sub.2 -- or 2 or more --CH.sub.2 -- or --CF.sub.2 -- not adjacent to each other in these groups may be substituted with --O--), X is --COO--, --O-- or a single bond, A is each independently selected from ##STR2## (Z.sup.1 and Z.sup.2 are hydrogen or fluorine), Y is a group selected from --COO--, --CH.sub.2 O--, --OCH.sub.2 --, and --CH.sub.2 CH.sub.2 --, R.sup.1 * is an optically active group represented by the formula --C*H--(CF.sub.3)--(CH.sub.2).sub.m --O--C.sub.n H.sub.2n+1 [II]. (m is an integer of 2-5, and n is an integer of 1-3.).

Tetralin compound, liquid crystal material and liquid crystal composition

Polycyclic compound, liquid crystal material consisting of the

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Yokohama, Japan

Toyotaro Maruyama