Liquid crystal materials and devices

Details Liquid crystal materials and devices Liquid crystal materials and devices

1973-11-06

1976-03-30

Padgett, Benjamin R.

Compositions

Liquid crystal compositions

23230LC, 252408, 260465R, 260465D, 260465G, 260465F, 260465K, 260473R, 260611A, 260645, 260649DP, 350160LC, 428 1, C09K 334, C07C12164, C07C12166, C07C12170, G02F 101, G02F 103, G02F 113, G02B 523

Patent

active

039473759

ABSTRACT:
A novel liquid crystal material contains a compound having a molecular structure such that the material exhibits a liquid crystal phase, the molecular structure of the compound being ##SPC1##
Or an orthosubstituted derivative thereof, where X and Y are different parasubstituents of the kind which promote liquid crystal behaviour, where the para substituent is a group selected from the following list; an alkyl group, an acyloxy group, an unsaturated group or an alkoxy group having more than one carbon atom; and where the para-substituent Y is a group selected from the following list; a cyano group, a nitro group, a group which includes a terminal cyano group, a group which includes a terminal nitro group and an acyloxy group. The material may be the said compound or it may be a multi-component solution or mixture containing it. The liquid crystal material may be nematic, smectic or cholesteric depending on the selection of the substituents X and Y. A device such as a twisted nematic effect device, incorporating the material may be operated at low temperatures. The material does not suffer from significant chemical and/or photochemical decomposition when used in a liquid crystal device.

REFERENCES:
patent: 2682562 (1954-06-01), Wender et al.
patent: 3322485 (1967-05-01), Williams
patent: 3636168 (1972-01-01), Josephson
patent: 3666948 (1972-05-01), Mechlowitz et al.
patent: 3691755 (1972-09-01), Girard
patent: 3697150 (1972-10-01), Wysochi
patent: 3767289 (1973-10-01), Aviram et al.
patent: 3773747 (1973-11-01), Steinstrasser
patent: 3795436 (1974-03-01), Doller et al.
patent: 3796479 (1974-03-01), Helfrich et al.
Gray, G. W. et al.; Electronics Letters, Vol. 9, No. 6, pp. 130-131 (Mar. 1973).
Gray, G. W. et al.; Electronics Letters, Vol. 9, No. 26, pp. 616-617 (Dec. 1973).
Gray, G. W.; "Molecular Structure and the Properties of Liquid Crystals," Academic Press, N.Y. (1962).
"Umwandlungstemperaturen Kristalliner Flussigkeiten," Kast, Landolt-Bornstein, Vol. 2, Part II, 6th Ed. pp. 266-267, 292, 293, 296-299 (1960).
C. A., Vol. 64, p. 12525c (1966), "Polarography, . . . of P-Nitrobiphenyls."
Usol'Tseva et al., Russian Chemical Reviews, Vol. 32, No. 9, pp. 495-509, (Sept. 1963).
Rondeau, R. E. et al., J. Amer. Chem. Soc., Vol. 94, No. 4, pp. 1096-1102, (Feb. 1972).
Schadt, M., J. Chem. Phys., Vol. 56, No. 4, pp. 1494-1497, (Feb. 1972).

Affiliated with

Also associated with

Rating

Liquid crystal materials and devices does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Liquid crystal materials and devices, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Liquid crystal materials and devices will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-519834