Trifluorobenzene derivative and liquid crystal composition conta

Details Trifluorobenzene derivative and liquid crystal composition conta Trifluorobenzene derivative and liquid crystal composition conta

1990-03-07

1991-07-16

Maples, John S.

Compositions

Liquid crystal compositions

Containing nonsteryl liquid crystalline compound of...

25229901, 25229966, 570129, C09K 1930, C07C 1908

Patent

active

050323130

ABSTRACT:
A trifluorobenzene derivative having a superior stability and a large positive dielectric anisotropy value and a liquid crystal composition containing the derivative are provided, which derivative is expressed by the formula ##STR1## wherein R is 1-10C alkyl and one --CH.sub.2 -- group or two not-adjacent --CH.sub.2 -- groups in the alkyl may be replaced by O and/or --CO-- and/or --COO-- and/or --CH.dbd.CH--, --A-- and --B-- are 1,4-cyclohexylene, 1,4-phenylene, pyrimidine-2,5-diyl or 1,3-dioxane-2,5-diyl, l and m each are 0, 1 or 2 and l+m.gtoreq.1, and Z.sup.1 and Z.sup.2 each are --COO--, --OCO--, --CH.sub.2 CH.sub.2 --, --OCH.sub.2 --, --CH.sub.2 O--, --CH.dbd.CH-- or single bond and may be same or different.

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