Eastman-kodak Company

Bruce H Klanderman

Richard T Klingbiel

James P Van Meter

David P Maier

Liquid crystalline materials comprised of substituted phenyl p-benzoyloxybenzoates are useful in electro-optical elements. These materials have low crystal to mesophase transition temperatures and have a broad mesophase temperature range.

P-Benzoyloxybenzoate

In a nematic liquid crystal composition, the improvement wherein said composition comprises predominantly by weight a mixture of

Liquid crystal compositions

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.

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Rochester, NY, United States of America

Bruce H Klanderman