Liquid crystal composition

Details Liquid crystal composition Liquid crystal composition

1973-04-04

1976-09-07

Lovering, Richard D.

Compositions

Liquid crystal compositions

23230LC, 252408, 350160LC, C09K 334

Patent

active

039793192

ABSTRACT:
A liquid crystal composition comprises a liquid crystal and a carboxylic acid or its ester as an additive. By the presence of the additive, the longitudinal axes of liquid crystal molecules can be spontaneously oriented in a direction perpendicular to the surface of a holding wall of a liquid crystal display plate. In particular, the additives may be esters of p-hydroxy- or m-hydroxy-benzoic acid, phenylacetic acids having 1 or 2 hydroxy groups or their esters, phenylpropionic acids having 1 or 2 hydroxy groups or their esters, or 3, 4, 5-trihydroxybenzoic acid esters, or said additives may be selected from the group consisting of compounds having the formulae: ##SPC1##
Wherein R.sub.3 is hydrogen or a normal alkyl group having 1 to 18 carbon atoms; R.sub.5 is hydrogen, hydroxy, a normal alkyl group having 1 to 16 carbon atoms or a normal alkoxy group having 1 to 16 carbon atoms; R.sub.6 is hydrogen, hydroxy or nitro; n.sub.1 is 1 or 2: and n.sub.2 is 0, 1 or 2.

REFERENCES:
patent: 3551026 (1970-12-01), Heilmeier
patent: 3679290 (1972-07-01), Adams et al.
patent: 3772209 (1973-11-01), Batesky
patent: 3803050 (1974-04-01), Haas et al.
patent: 3827780 (1974-08-01), Labes
patent: 3838059 (1974-09-01), Wong
Fieser et al.: Organic Chemistry, Third Edition, Reinhold Publishing Corp., New York, 1956, pp. 656 and 661.

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