Dyes for use in liquid crystal mixtures

Details Dyes for use in liquid crystal mixtures Dyes for use in liquid crystal mixtures

1982-01-04

1984-08-21

Gron, Teddy S.

Compositions

Liquid crystal compositions

Containing pleochroic dye

350349, C09K 334, G02F 113

Patent

active

044668996

ABSTRACT:
The use of a dye of the general formula I ##STR1## where R is a heterocyclic radical, X is hydrogen, nitro, or unsubstituted or substituted amino, hydroxyl or mercapto and Y is hydrogen, nitro, or unsubstituted or substituted amino, hydroxyl or mercapto, and the ring A can be additionally substituted, in an electro-optical display containing liquid crystals, and a liquid-crystal mixture containing a dye of the general formula in claim 1.

REFERENCES:
patent: 4288147 (1981-09-01), Koch
patent: 4299720 (1981-11-01), Osman et al.
patent: 4304683 (1981-12-01), Morinaka et al.
patent: 4356102 (1982-10-01), Aftergut et al.
patent: 4358392 (1982-11-01), Cognard et al.
patent: 4360447 (1982-11-01), Morinaka et al.
patent: 4363743 (1982-12-01), Moeller et al.
patent: 4376715 (1983-03-01), Cognard et al.
Cognard, J., et al., Mol. Cryst. Liq. Cryst., vol. 70, pp. 1-19, (1981).
Bloom, A., et al., Mol. Cryst. Liq. Cryst., vol. 41 (Letters), pp. 1-4, (1977).
G. W. Gray, Chima 34, (1980), pp. 37 to 57.
F. Gories, T. J. Reeve, JSDC, Oct. 1979, pp. 35 to 59.
Robert J. Cox, Nol. Cryst. Liq. Cryst., 1979, vol. 55, pp. 7 to 32.
Photostatable Anthraquinone Pleochroic Dyes, Mol. Cryst. Liq. Crystal, 59, 1980, pp. 299-316.

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