Azo dyes and liquid-crystalline materials containing these dyes

Details Azo dyes and liquid-crystalline materials containing these dyes Azo dyes and liquid-crystalline materials containing these dyes

1984-11-21

1988-02-09

Higel, Floyd D.

Organic compounds -- part of the class 532-570 series

Organic compounds

Azo

534561, 534582, 534596, 534649, 534809, 534887, 2522991, 25229968, C09B 3116, C09B 3318, C09B 3555, G09K 334

Patent

active

047242590

ABSTRACT:
Compounds of the general formula I ##STR1## where R.sup.1 and R.sup.2 independently of one another are each C.sub.6 -C.sub.24 -alkyl or are each benzyl which is unsubstituted or substituted by alkyl or by cycloalkyl, and one of the radicals may furthermore be hydrogen, and the rings A, B, C and D can be further substituted by chlorine, methyl or methoxy, with the exception of the compound of the formula ##STR2## are useful as dyes in electrooptical liquid crystal displays or for the production of polarization films.

REFERENCES:
patent: 2941560 (1976-03-01), Renfrew et al.
patent: 4145114 (1979-03-01), Coates et al.
patent: 4231746 (1980-11-01), Dehnert et al.
patent: 4308161 (1981-12-01), Aftergut et al.
patent: 4308162 (1981-12-01), Cole et al.
patent: 4308163 (1981-12-01), Aftergut et al.
patent: 4308164 (1981-12-01), Aftergut et al.

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