Tetralin compound, liquid crystal material and liquid crystal co

Details Tetralin compound, liquid crystal material and liquid crystal co Tetralin compound, liquid crystal material and liquid crystal co

1999-09-21

2000-09-12

Kelly, C. H.

Compositions

Liquid crystal compositions

Containing nonsteryl liquid crystalline compound of...

25229965, 560102, C09K 1932, C09K 1912, C07C 6976

Patent

active

061173592

ABSTRACT:
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.).

REFERENCES:
patent: 5246222 (1993-09-01), Shimizu et al.
patent: 5322639 (1994-06-01), Kawabata et al.
patent: 5356561 (1994-10-01), Shimizu et al.
patent: 5776365 (2000-02-01), Taatsuki et al.
patent: 6019911 (2000-02-01), Hirano et al.

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