Composition for liquid crystal color display element

Details Composition for liquid crystal color display element Composition for liquid crystal color display element

1980-03-10

1981-12-08

Gron, Teddy S.

Compositions

Liquid crystal compositions

Containing pleochroic dye

252408, 260383, 350349, 350350R, G02F 113, C09K 334

Patent

active

043046835

ABSTRACT:
A composition for nematic liquid crystal color display elements, said composition comprising at least one anthraquinonic dye represented by the formula ##STR1## wherein X and X' are the same and represent --NH.sub.2 or --OH, and R represents a linear or branched alkyl group having 1 to 15 carbon atoms, a cyclohexyl group or a group of the formula --R.sub.2 --O--R.sub.3 in which R.sub.2 is an alkylene group having 1 to 3 carbon atoms and R.sub.3 is a linear or branched alkyl group having 1 to 15 carbon atoms dissolved in at least one nematic liquid crystal.

REFERENCES:
patent: 3549667 (1976-12-01), Wunderlich et al.
patent: 3669994 (1972-06-01), Harvey et al.
patent: 3960751 (1976-06-01), Moriyama et al.
patent: 4232949 (1980-11-01), Huffman
patent: 4232950 (1980-11-01), Benham
Constant, J., et al., "Photostable Anthraquinone Pleochroic Dyes", Presented at 7th Internat'l. Liq. Cryst. Conf., Bordeaux, Fr. (Aug. 1978).

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