Liquid crystals having pleochroic dyes

Details Liquid crystals having pleochroic dyes Liquid crystals having pleochroic dyes

1981-02-04

1982-12-14

Gron, Teddy S.

Compositions

Liquid crystal compositions

Containing pleochroic dye

260177, 260186, 260187, 260369, 260377, 260378, 260376, 260380, 260383, 350349, C09K 334, G02F 113, C09B 102, C09B 120, C09B 150, C09B 156, C09B 132, C09B 154, C09B 4322

Patent

active

043637434

ABSTRACT:
Anthraquinone dyes of the general formula: ##STR1## wherein R.sup.1, R.sup.3, R.sup.4 and R.sup.6 are selected from the group consisting of H, OH, OCH.sub.3, NO.sub.2, NH.sub.2 and NHCH.sub.3 ; R.sup.2 and R.sup.5 are selected from the group consisting of: ##STR2## wherein R.sup.7 is selected from the group consisting of alkyl-, aryl-, amino-, alkylamino-, dialkylamino-, arylamino-, alkyloxy-, and aryloxy radicals, along with their syntheses routes are disclosed. The dyes are particularly useful in liquid crystal displays which function with a "guest host" effect or in other electrooptical display devices having a medium therein switchable between different ordering states.

REFERENCES:
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Saeva, F. D., Xerox Disclosure Journal, vol. 1, Nos. 9/10, pp. 61-62, (1976).
Cognard, Jr., et al., Mol. Cryst. Liq. Cryst., vol. 70, pp. 1-19, (1981).
Photostable Anthraquinone Pleochroic Dyes, by Malvern et al., Dorset.
Mol. Cryst. Liq. Cryst., vol. 55, pp. 1-32, 1979, Cox, Gordon & Breach, Sci. Pub. Inc.
G. H. Heilmeier et al., "Guest-Host Interactions in Nematic Liquid Crystals, A New Electro-Optical Effect", Applied Physics Letters, vol. 13, No. 3, (8/68), pp. 91-92.
J. Constant et al., "Pleochroic Dyes with High-Order Parameters for Liquid-Crystal Displays", Electronics Letters, vol. 12, No. 20, (4/76), pp. 514-515.
D. L. White et al., "New Absorptive Mode Reflective Liquid-Crystal Display Device", Journal of Applied Physics, vol. 45, No. 11, (11/74), pp. 4718-4723.
A. Bloom et al., "Criteria for Evaluating Pleochroic Dye Liquid-Crystal Displays", IEEE Transactions on Electron Devices, vol. ED-24, No. 7, (7/77), pp. 823-826.

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