Bisazo dyes and their use in liquid crystalline materials

Details Bisazo dyes and their use in liquid crystalline materials Bisazo dyes and their use in liquid crystalline materials

1985-09-16

1987-07-21

Gron, Teddy S.

Compositions

Liquid crystal compositions

Containing pleochroic dye

534577, 350349, C09K 1900

Patent

active

046816992

ABSTRACT:
Novel compounds of the general formula I ##STR1## where R is hydrogen, unsubstituted or substituted alkyl, aralkyl, cycloalkyl, aryl, alkoxy, aralkoxy, cycloalkyloxy, aryloxy, alkylthio, aralkylthio or cycloalkylthio, Y is a radical of the formula ##STR2## and the rings A and B may be further substituted or fused to a benzene ring, and R.sup.1 and R.sup.2 are each hydrogen or unsubstituted or substituted alkyl, aralkyl or cycloalkyl, or together with the nitrogen atom form piperidino, pyrrolidino or morpholino, and R.sup.3 is hydrogen, alkyl, or cycloalkyl, are particularly useful as dyes in liquid-crystalline media.

REFERENCES:
patent: 3221005 (1965-11-01), Moore et al.
patent: 3221006 (1965-11-01), Moore et al.
patent: 3732201 (1973-05-01), Ramanathan
patent: 4565424 (1986-01-01), Huffman et al.
Bloom et al., Mol. Cryst. Liq. Cryst., vol. 40, pp. 213-221, (1977).

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