Liquid-crystal mixture with a pleochroic anthraquinone dye, and

Details Liquid-crystal mixture with a pleochroic anthraquinone dye, and Liquid-crystal mixture with a pleochroic anthraquinone dye, and

1981-09-10

1985-01-01

Gron, Teddy S.

Compositions

Liquid crystal compositions

Containing pleochroic dye

260377, 260378, 260380, 260381, 350349, C09K 334, C09B 5500, C09B 116, C09B 150

Patent

active

044915322

ABSTRACT:
Liquid-crystal mixture with a pleochroic anthraquinone dye of the general formula ##STR1## with R.sup.1, R.sup.3, R.sup.4, R.sup.6 =H, OH, OCH.sub.3, NH.sub.2, NHCH.sub.3, NO.sub.2, characterized by the feature that ##STR2## (R.sup.7 =H, alkyl, cycloalkyl, alkoxy, alkylmercapto, amino, alkylamino, dialkylamino, nitro, cyano, halogen), ##STR3## COOR.sup.9, CH.sub.2 --OR.sup.9 (R.sup.8 =H, alkyl, cycloalkyl, alkoxy, alkylmercapto, amino, alkylamino, dialkylamino, nitro, cyano, halogen); R.sup.9 =H, alkyl and either R.sup.1, R.sup.4 =H, OH, NH.sub.2, NHCH.sub.3, NO.sub.2, NHCH.sub.3, NO.sub.2, OCH.sub.3, where at least one of the two radical is an NH.sub.2 or an NHCH.sub.3, R.sup.3 =R.sup.6 =H, or R.sup.3, R.sup.6 =H, OH, NH.sub.2, NHCH.sub.3, NO.sub.2, OCH.sub.3, where at least one of the two radicals is an NH.sub.2 or an NHCH.sub.3, R.sup.1 =R.sup.4 =H.

REFERENCES:
patent: 4032219 (1977-06-01), Lonstant et al.
patent: 4232950 (1980-11-01), Benham
patent: 4273929 (1981-06-01), Boller et al.
patent: 4299720 (1981-11-01), Osman et al.
patent: 4304683 (1981-12-01), Morinaka et al.
patent: 4308163 (1981-12-01), Aftergut 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.
patent: 4428858 (1984-01-01), Cognard et al.
Cognard, J., et al., Mol. Cryst. Liq. Cryst., vol. 70, pp. 1-19, (1981).
Abstracts: The Eighth International Liq. Cryst. Conf., I-23 and I-24, Kyoto, Japan, (Jun. 30-Jul. 4, 1980).

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