Liquid crystal compositions with novel tris-azo dichroic dyes

Details Liquid crystal compositions with novel tris-azo dichroic dyes Liquid crystal compositions with novel tris-azo dichroic dyes

1980-12-22

1982-11-16

Gron, Teddy S.

Compositions

Liquid crystal compositions

Containing pleochroic dye

350349, 260169, G02F 113, C09K 334, C09B 3116

Patent

active

043593984

ABSTRACT:
Novel tris-azo dyes and a liquid crystal composition containing the tris-azo dyes. The tris-azo dyes are of the general formula: ##STR1## wherein R.sub.1 and R.sub.2 are various aromatic groups including aromatic amines, substituted aromatic amines, hydroxy-substituted aromatic groups and substituted hydroxy-containing aromatic groups. When the tris-azo dichroic dyes are used as a guest dye in a host liquid crystal material, they form a novel liquid crystal composition for use in liquid crystal displays.

REFERENCES:
patent: 4116861 (1978-09-01), Aftergut et al.
patent: 4122027 (1978-10-01), Cole, Jr. et al.
patent: 4128496 (1978-12-01), Cole, Jr. et al.
patent: 4128497 (1978-12-01), Cole, Jr. et al.
patent: 4137143 (1979-01-01), Osmam
patent: 4141627 (1979-02-01), Bloom et al.
patent: 4145114 (1979-03-01), Coates et al.
patent: 4153343 (1979-05-01), Bloom et al.
Cox, R. J.; Mol. Cryst. Liq. Cryst., vol. 55, pp. 1-32 (1979).
Bloom, A., et al.; Mol. Cryst. Liq. Cryst., vol. 40, pp. 213-221 (1977).
Bloom, A., et al.; Mol. Cryst. Liq. Cryst. (Lett.), vol. 41, pp. 1-4 (1977).
White, D. L., et al., J. Appl. Phys., vol. 45, No. 11, pp. 4718-4723 (1974).

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