Composition for liquid crystal color display elements

Details Composition for liquid crystal color display elements Composition for liquid crystal color display elements

1980-03-11

1982-11-23

Gron, Teddy S.

Compositions

Liquid crystal compositions

Containing pleochroic dye

350349, 350350R, G02F 113, C09K 334

Patent

active

043604471

ABSTRACT:
A composition for nematic liquid crystal color display elements, said composition comprising at least one anthraquinonic dye represented by the following formula ##STR1## wherein X and Y are identical or different and represent --NH.sub.2 or --OH; Z represents halogen, --OR, --NHR, ##STR2## --CONHR.sub.2 or --COOR.sub.2, in which R represents an alkyl group having 1 to 15 carbon atoms or a lower alkyl group optionally substituted by --OH, ##STR3## represents hydrogen, halogen, --OH, --OCH.sub.3, an alkyl group having 1 to 15 carbon atoms, or a methoxy group optionally substituted by ##STR4## and R.sub.2 is a phenyl group, an alkyl group having 2 to 5 carbon atoms or a cyclohexyl group; and n is an integer of 1 or 2 provided that when X is --NH.sub.2 and Y is --OH, and when X and Y are both --OH, n is an integer of 1, and when n represents an integer of 2, the two Z's may be identical or different dissolved in at least one nematic liquid crystal.

REFERENCES:
patent: 3960751 (1976-06-01), Moriyama et al.
patent: 4232949 (1980-11-01), Huffman
patent: 4232950 (1980-11-01), Benham
patent: 4273929 (1981-06-01), Boller et al.
patent: 4304683 (1981-12-01), Morihaka et al.
Saeva, F., Xerox Disclosure Journal, vol. 1, Nos. 9/10, pp. 61-62 (Sep./Oct. 1976).
Cognard, J., et al., Mol. Cryst. Liq. Cryst., vol. 70, pp. 1-19 (1981).
Constant, J., et al., "Photostable Anthraquinone Pleochroic Dyes", presented at 7th Internat'l Liq. Cryst. Conf., Bordeaux, Fr. (Aug. 1978).

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