Guest-host liquid crystalline composition

Details Guest-host liquid crystalline composition Guest-host liquid crystalline composition

1983-01-13

1983-11-08

Gron, Teddy S.

Compositions

Liquid crystal compositions

Containing pleochroic dye

25229961, 350349, 350350R, 549369, 549373, 549375, G02F 113, C09K 334

Patent

active

044141319

ABSTRACT:
A novel nematic liquid crystalline composition is provided. A novel liquid crystalline chiral compound, (+)5-(2-methyl) butyl-2(4-cyanophenyl)-1, 3-dioxane, is also provided. When admixed together, these novel components form a phase-change cholesteric liquid crystalline composition which is highly useful as the host medium in a guest-host electrooptical display as a result of its low electrical threshold and optical saturation voltages, steep saturation curve, relatively low optical birefringence, low viscosity and broad liquid crystalline mesomorphic range.
The host medium in conjunction with a suitable pleochroic dye provides an improved guest-host composition which exhibits a contrast of greater than 3:1 in certain displays, especially those having liquid crystal alignment layer means providing a moderate tilt angle of 10.degree.-40.degree. at the substrate/guest-host composition interface.

REFERENCES:
patent: 4298528 (1981-11-01), Sethofer
patent: 4323471 (1982-04-01), Sethofer
patent: 4323472 (1982-04-01), Sethofer
patent: 4324455 (1982-04-01), Imahori et al.
patent: 4335012 (1982-06-01), Sorkin
patent: 4344856 (1982-08-01), Demus et al.
patent: 4348324 (1982-09-01), Demus et al.
patent: 4356104 (1982-10-01), Hsu
patent: 4364838 (1982-12-01), Boller et al.
Sorkin, H., Mol. Cryst. Liq. Cryst., vol. 56 (Letters), pp. 279-281 (1980).

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