Liquid crystal compounds and compositions

Details Liquid crystal compounds and compositions Liquid crystal compounds and compositions

1988-08-19

1990-05-01

Gron, Teddy S.

Compositions

Liquid crystal compositions

Containing pleochroic dye

25229901, 2522996, 25229961, 25229962, 25229963, 25229964, 25229965, 25229966, 25229967, 25229968, 350350R, 350350S, 534577, 544229, 544238, 544239, 544240, 544241, 544295, 544296, 544298, 544315, 544316, 544318, 544322, 544330, 544331, 544332, 544333, 544334, 544335, 544357, 544406, 544409, 544408, 544336, 558384, 558412, 558416, 558271, 558272, 558273, 558275, 558276, 558288, 558290, 560 9, 560 10, 560 18, 560 17, 560 21, 560 22, 560 23, 560 20, 560 35, 560 59, 560 61, 560 62, 560 64, 560 73, 560 65, 560

Patent

active

049216325

ABSTRACT:
Liquid Crystal compounds represented by the following formula are disclosed. ##STR1## wherein R and R' are independently selected from alkyl groups containing 1.about.20 carbon atoms; X is --O--, --O--CO--O-- or direct bond; A.sub.1 and A.sub.2 are independently cyclic groups (such as phenylene and biphenylene), said cyclic groups may be substituted with 1.about.4 fluorine, chlorine or bromine atoms, or 1 or 2 substituent groups selected from the group consisting of cyano, nitro and trifluoromethyl groups; Y is --CO--O--, --O--CO--, --C.tbd.C--, --CH.sub.2 O--, --OCH.sub.2 --, --CH.dbd.N--, --N.dbd.CH--, --N.dbd.N--, --CH.sub.2 S--, --SCH.sub.2 -- or direct bond; and * represents asymmetric atom providing optical activity.

REFERENCES:
patent: 4576732 (1986-03-01), Isogai et al.
patent: 4613209 (1986-09-01), Goodby et al.
Japanese Journal of Applied Physics, vol. 26, No. 2, Feb. 1987, pp. L77-L-78.
Chemistry Express, vol. 2, No. 1, pp. 53-56 (1987).
Yoshino, K. et al., Jap. J. Appl. Phys., vol. 26, No. 2, pp. L77-L78 (1987).
Yoshino, K. et al., Chem. Express, vol. 2, No. 1, pp. 53-56 (1987).
Goodby, J. W. et al., Liquid Crystals and Ordered Fluids, vol. 4, Griffin, A. et al., Ed., Plenum Press, N.Y., pp. 1-32 (1984).
Goodby, J. W. et al., Mol. Cryst. Liq. Cryst., vol. 110, pp. 175-203 (1984).
C.A., vol. 106: 206160+ (Jun. 1987).
C.A., vol. 106: 206165y (Jun. 1987).

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