Compositions – Liquid crystal compositions – Containing nonsteryl liquid crystalline compound of...
Patent
1990-02-27
1992-01-21
Maples, John S.
Compositions
Liquid crystal compositions
Containing nonsteryl liquid crystalline compound of...
25229901, 560 65, 560 73, 560128, 359103, 359104, C09K 1930, C09K 1952, C07C 6976
Patent
active
050825895
ABSTRACT:
Compounds of the formula ##STR1## wherein m represents is the number of 0 to 1; A is a single convalent bond, --CH.sub.2 --CH.sub.2 --, --OCH.sub.2 --, --COO-- or --OOC--; rings B, C and D are 1,4-phenylene optionally substituted with cyano, halogen or lower alkyl; Y.sup.1 and Y.sup.2 are hydrogen or one of them also is cyano; and R.sup.1 and R.sup.2 each represents C.sub.1 -C.sub.18 -alkyl or C.sub.2 -C.sub.18 alkenyl, either of which is optionally halogen-substituted, in which one CH.sub.2 group or two non-adjacent CH.sub.2 groups is/are optionally replaced by oxygen: with the provisos that at least one of R.sup.1 and R.sup.2 has a chiral carbon atom or R.sup.1 is straight-chain C.sub.4-18 -alkoxy and R.sup.2 is straight C.sub.3-18 -alkyl or a C--C double bond or both when A is --COO-- and at least one of R.sup.1 and R.sup.2 has a C--C double bond when A is a single covalent bond, their preparation, liquid crystalline mixtures containing these compounds and their use for electro-optical purposes are described.
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Buchecker Richard
Fromm Hans-Jurgen
Kelly Stephen
Schadt Martin
Gould George M.
Hoffmann-La Roche Inc.
Johnston George W.
Kass Alan P.
Maples John S.
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