Type A smectic liquid crystal having a positive dielectric aniso

Details Type A smectic liquid crystal having a positive dielectric aniso Type A smectic liquid crystal having a positive dielectric aniso

1981-07-15

1983-09-06

Gron, Teddy S.

Compositions

Liquid crystal compositions

Containing nonsteryl liquid crystalline compound of...

25229901, 2522995, 260465D, 560 62, 560 65, 560 73, 560107, 560108, 350350R, 350350S, C09K 334, G02F 113, C07C12160, C07C 6962

Patent

active

044028555

ABSTRACT:
A family of liquid crystals having a type A smectic mesophase with a positive dielectric anisotropy, which are particularly useful in the case of the thermo-optical effect.
The substances of the family are in accordance with the general formula: ##STR1## in which R represents an organic group of the alkyl or alkoxy type containing 1 to 15 carbon atoms and in which X and Y designate either the bromine or the nitrile radical.

REFERENCES:
patent: 3947375 (1976-03-01), Gray et al.
patent: 3951846 (1976-04-01), Gavrilovic
patent: 4029594 (1977-06-01), Gavrilovic et al.
patent: 4073742 (1978-02-01), Erdmann et al.
patent: 4228087 (1980-10-01), Dubois et al.
patent: 4235736 (1980-11-01), Beguin et al.
patent: 4256656 (1981-03-01), Beguin et al.
Karamysheva, L. A., et al., J. Phys., Coll C3, Suppl. No. 4, vol. 40, pp. C3-37-40 (Apr. 1979).
Dubois, J. C., et al., Mol. Cryst. Liq. Cryst, vol. 42, pp. 139-152 (1977).

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