Dichroitic anthraquinone dyestuffs useful in liquid crystalline

Details Dichroitic anthraquinone dyestuffs useful in liquid crystalline Dichroitic anthraquinone dyestuffs useful in liquid crystalline

1981-10-23

1984-06-26

Gron, Teddy S.

Compositions

Liquid crystal compositions

Containing pleochroic dye

260378, 260380, 260383, 350349, C02F 113, C09K 334, C09B 100

Patent

active

044565453

ABSTRACT:
New dichroitic dyestuffs useful as components of liquid crystalline dielectrics for electro-optical indicator elements based on the guest-host effect have the formula ##STR1## wherein W, X, Y and Z each is hydrogen, NH.sub.2, OH, NHCH.sub.3 or NHC.sub.2 H.sub.5, provided that not more than 3 of these are the same, and one or two of R.sub.1, R.sub.2, R.sub.3 and R.sub.4 are a group of the formulae (IIa), (IIb), (IIc), (IId) or (IIe) ##STR2## and the others are hydrogen, R being alkyl of 1-12 carbon atoms.

REFERENCES:
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patent: 4304683 (1981-12-01), Morinaka et al.
patent: 4358392 (1982-11-01), Cognard
patent: 4360447 (1982-11-01), Morinaka et al.
patent: 4363743 (1982-12-01), Mueller et al.
patent: 4376715 (1983-02-01), Cognard et al.
Saeua, F. D., Xerox Disclosure J., vol. 1, No. 9/10, pp. 61-62, (9/10 1976).
Cognaro, J. et al., Mol. Cryst. Liq. Cryst, vol. 70, pp. 1-19, (1981).
Krasnosel'Skaya, M. I. et al., Zh. Org. Khim, vol. 8, No. 11, pp. 2379-2382, (1972).
Ca, vol. 80, 132301k, 132302m, (1974).
Ca, vol. 77, 61659h, (1972).
Ca, vol. 73, 131973z, (1970).

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