Ferroelectric liquid crystal mixtures and compounds as well as e

Details Ferroelectric liquid crystal mixtures and compounds as well as e Ferroelectric liquid crystal mixtures and compounds as well as e

1990-01-11

1992-03-31

Maples, John S.

Compositions

Liquid crystal compositions

25229961, 549369, 549371, 549372, 549374, 549375, 359103, C09K 1952, C09K 1934, C07D31906

Patent

active

051005778

ABSTRACT:
A ferroelectric liquid crystalline mixture containing at least one optically active compound of the general formula ##STR1## wherein X.sup.1 denotes a single covalent bond, --COO--, --OOC--, --CH.sub.2 CH.sub.2 --, --OCH.sub.2 -- or --CH.sub.2 O--; one of rings A.sup.1, A.sup.2 and A.sup.3 represents trans-m-dioxan-2,5-diyl and the other two of rings A.sup.1, A.sup.2 and A.sup.3 each independently represent unsubstituted 1,4-phenylene or 1,4-phenylene substituted with cyano, halogen or lower alkyl; R.sup.1 and R.sup.2 each independently signify an optionally halogen-substituted alkyl group with up to 18 carbon atoms in which optionally 1 CH.sub.2 group or 2 non-adjacent CH.sub.2 groups is/are replaced by --O--, --CO--, --COO-- and/or --OOC--,
as well as novel compounds falling under formula I and ferroelectric electrode-optical indicating devices including same.

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