Liquid crystal composition for electric field indication

Details Liquid crystal composition for electric field indication Liquid crystal composition for electric field indication

1974-10-22

1976-08-17

Padgett, Benjamin R.

Compositions

Liquid crystal compositions

23230LC, 252408, 350160LC, C09K 334, G02F 113

Patent

active

039752879

ABSTRACT:
A liquid crystal composition for indicating the occurence of an electric field which has a long effective life, assumes a clear color change and comprises from about 10 to about 60 % by weight of a cholesteryl carbamate having, as the substituent group at the nitrogen atom of the carbamate, an aliphatic hydrocarbon group, a monocyclic aromatic hydrocarbon group or a substituted hydrocarbon group, and from about 40 to about 90 % by weight of a liquid crystal component compatible with the carbamate comprising cholesteric liquid crystal substances other than the cholesteryl carbamate.

REFERENCES:
patent: 3627408 (1971-12-01), Fergason
patent: 3656909 (1972-04-01), Dixon
patent: 3744920 (1973-07-01), Adams et al.
patent: 3867016 (1975-02-01), Sagane

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