Organic materials

Details Organic materials Organic materials

1982-08-24

1984-08-07

Gron, Teddy S.

Compositions

Liquid crystal compositions

Containing pleochroic dye

260369, 260378, 260380, 260381, 260383, 260384, 350346, 350349, 350350R, 350350S, G02F 113, C09K 334

Patent

active

044642822

ABSTRACT:
A material suitable for a guest-host liquid crystal device comprises a solution of a liquid crystal material and a pleochroic dye wherein the pleochroic dye comprises at least one anthraquinone compound free from water solubilizing and ionic substituents and having the formula: ##STR1## wherein P is OH or NH.sub.2 ; each group X.sup.A is independently selected from OH, NO.sub.2, SR and NZ.sub.1 Z.sub.2 provided that one group X.sup.A is SR and the other group X.sup.A is OH, NO.sub.2 or NZ.sub.1 Z.sub.2 is 1 or 2; each group Q.sub.1 is independently alkyl having from 1 to 20 carbon atoms; each group R is independently selected from alkyl having from 1 to 20 carbon atoms, aryl having up to 15 carbon atoms and cycloalkyl having from 4 to 8 carbon atoms.

REFERENCES:
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patent: 3337553 (1967-08-01), Altermatt
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patent: 4126626 (1978-11-01), Jost
patent: 4128396 (1978-12-01), Wick et al.
patent: 4136100 (1979-01-01), Epple
patent: 4176113 (1979-11-01), Wick et al.
patent: 4232949 (1980-11-01), Huffman
patent: 4232950 (1980-11-01), Benham
patent: 4363743 (1982-12-01), Moeller et al.
patent: 4391489 (1983-07-01), Harrison et al.
patent: 4394070 (1983-07-01), Brown et al.
patent: 4405211 (1983-09-01), Harrison et al.
Reid E. E., et al., JACS, vol. 43, pp. 2104-2119 (1921).
Hoffman, W. S., et al., JACS, vol. 45, pp. 1831-1838, (1923).

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