Liquid crystal compound with a 4-(optically active alkyl)-3-cyan

Details Liquid crystal compound with a 4-(optically active alkyl)-3-cyan Liquid crystal compound with a 4-(optically active alkyl)-3-cyan

1988-03-18

1990-04-03

Gron, Teddy S.

Compositions

Liquid crystal compositions

Containing nonsteryl liquid crystalline compound of...

25229901, 25229963, 25229965, 25229966, 25229967, 350350R, 350350S, 544238, 544239, 544240, 544224, 544296, 544316, 544318, 544333, 544334, 544335, 546257, 546287, 546296, 546300, 546330, 558420, 558423, C09K 1412, C09K 1420, C09K 1930, C09K 1924, C07C12175, C07D23936, C07D23938, C07D23930

Patent

active

049138383

ABSTRACT:
An optically active liquid crystal compound having specific features suitable to a display mode utilizing ferroelectric chiral smectic phases and particularly having a large spontaneous polarization value, and a chiral liquid crystal composition containing the compound are provided, which compound is expressed by the formula ##STR1## wherein R.sup.1 represents an alkyl group of 2 to 18 carbon atoms; R.sup.2 represents an alkyl group or alkoxy group each of 1 to 20 carbon atoms, hydrogen atom, a halogen atom or cyano group; A represents --COO-- or --OCO--; B and C each represent a single bond, ##STR2## wherein X represents hydrogen atom, a halogen atom or cyano group; and l, m and n each represent 0 or 1.

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