Liquid crystal compositions with positive dielectric anisotropy

Details Liquid crystal compositions with positive dielectric anisotropy Liquid crystal compositions with positive dielectric anisotropy

1974-05-02

1976-09-28

Padgett, Benjamin R.

Compositions

Liquid crystal compositions

350150, 350160LC, C09K 334, G02F 113

Patent

active

039830497

ABSTRACT:
Non-liquid crystal additives to negative dielectric anisotropy liquid crystals produce a positive dielectric anisotropy. Criteria for empirically determining suitable additives are disclosed. The general structure of suitable compounds is: ##SPC1##
Wherein Z is a divalent radical, n is an integer having a value of 1 to 2; X, X', Y, Y' occupy only meta- and para-positions; X and X' are either electron withdrawing polar groups or hydrogen; Y and Y' are either electron repelling polar groups or hydrogen; at least one of X, X', Y and Y' is a polar group and, when only one of X, X', Y and Y' is a polar group, it occupies the para-position.

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