Liquid crystal compositions and devices

Details Liquid crystal compositions and devices Liquid crystal compositions and devices

1973-05-17

1976-05-11

Padgett, Benjamin R.

Compositions

Liquid crystal compositions

350160LC, G02F 113, C09K 334

Patent

active

039561674

ABSTRACT:
Improved liquid crystal compositions comprise a major portion by weight of at least three different p-alkoxybenzylidene-p'-aminophenylalkanoates and a minor portion by weight of p-methoxybenzylidene-p'-butylaniline and p-ethoxybenzylidene-p'-butylaniline. The compositions have broader nematic ranges than either ternary mixtures of the alkanoates or binary mixtures of the other two compounds. In addition, when certain dopants are added to the compositions, optimum improvement in properties is obtained using less dopant than that required by prior art compositions.

REFERENCES:
patent: 3540796 (1970-11-01), Goldmacher et al.
patent: 3656834 (1972-04-01), Haller et al.
patent: 3689525 (1972-09-01), Scheule et al.
patent: 3690745 (1972-09-01), Jones
patent: 3698449 (1972-10-01), Sorkin et al.
patent: 3772210 (1973-11-01), Lodolini
patent: 3816113 (1974-06-01), Haas et al.
patent: 3819531 (1974-06-01), Saeva et al.
patent: 3826757 (1974-07-01), Wong
patent: 3872140 (1975-03-01), Klanderman et al.
L. T. Creagh and A. R. Kmetz, "Selective Doping of MBBA to Optimize Display Performance," J. Electron. Mater., Vol. 1, pp. 350-356, (1972).

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