Nematic liquid crystal compositions

Details Nematic liquid crystal compositions Nematic liquid crystal compositions

1973-11-12

1976-06-01

Padgett, Benjamin R.

Compositions

Liquid crystal compositions

350160LC, C09K 334, G02F 113

Patent

active

039607488

ABSTRACT:
A nematic liquid crystal composition having a resistivity of about 1 .times. 10.sup.8 to 1 .times. 10.sup.10 ohm-cm and a broad mesophase comprising a mixture prepared by transiminization between at least one Schiff base compound of the formula ##SPC1##
And at least one other Schiff base of the formula: ##SPC2##
Wherein R, R.sup.1, R.sup.2 and R.sup.3 are alkyl radicals having 1 to 18 carbon atoms. Advantageously the Schiff bases I and II are subjected to transiminization at a molar ratio of about 5/1 to 1/5.

REFERENCES:
patent: 3540796 (1970-11-01), Goldmacher et al.
patent: 3675987 (1972-07-01), Rafuse
patent: 3738942 (1973-06-01), Matsumoto et al.
patent: 3756694 (1973-09-01), Soree et al.
patent: 3826757 (1974-07-01), Wong
patent: 3872140 (1975-03-01), Klanderman et al.

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