Electro-optic device

Details Electro-optic device Electro-optic device

1975-12-22

1977-06-28

Padgett, Benjamin R.

Compositions

Liquid crystal compositions

23230LC, 252408, 260205, 260206, 260207, 2602071, 350160LC, C09K 334, G02F 113

Patent

active

040324702

ABSTRACT:
Novel liquid crystal dyes of the formula ##STR1## wherein (CHOL) is a cholesteryl radical, X can be 0 or NH, R.sub.1 can be H, -OH, methyl, fluoro or chloro; R.sub.2 can be --NO.sub.2, --CN, N--(alkyl).sub.2, --OCOOR, --OCOR, alkyl or alkoxy and R.sub.3 can be H, methyl, fluoro or chloro, can be added to known liquid crystal compositions to impart color to the mixtures and improved contrast to a liquid crystal electro-optic device containing such mixtures.

REFERENCES:
patent: 3597044 (1971-08-01), Castellano
patent: 3650603 (1972-03-01), Heilmeier et al.
patent: 3656909 (1972-04-01), Dixon et al.
patent: 3703331 (1972-11-01), Goldmacher et al.
patent: 3720658 (1973-03-01), Goldberg et al.
patent: 3806230 (1974-04-01), Haas
patent: 3842275 (1974-10-01), Haas et al.
patent: 3891307 (1975-06-01), Tsukamoto et al.
patent: 3956169 (1976-05-01), Nakano et al.
patent: 3960750 (1976-06-01), Moriyama et al.
patent: 3975286 (1976-08-01), OH

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