Inventors:
Kenneth J. Harrison - Malvern Link, GB2
Leo T. Carlino - Los Gatos CA
Assignee:
Exxon Research & Engineering Co. - Florham Park NJ
International Classification:
C09K 334
G02F 113
Abstract:
In accordance with the invention, a liquid crystal composition for multiplexed twisted neumatic displays which exists in a nematic mesophase from at least about -20. degree. C. to 50. degree. C. comprises: (a) From three to five cyanobiphenyl compounds represented by the formula: ##STR1## wherein R is selected from the group consisting of straight chain alkyl groups having two to ten carbon atoms, the propoxy radical ranging from about 5 to 12% by weight of the total composition, and the substituent ##STR2## ranging from about 5 to 12% by weight of the total composition wherein R' is selected from the group consisting of straight chain alkyl groups having three to five carbon atoms, and wherein the saturated ring has a trans conformation, at least one of said compounds having R as an alkyl group with two to five carbon atoms and wherein compounds having R as an alkyl group with two or four carbon atoms range from about 3 to 10% by weight of the total composition and at least one of said compounds having R as an alkyl group with seven to ten carbon atoms and ranging from about 20 to 50% by weight of the total composition; (b) at least one cyclohexane carboxylate ester compound represented by the formula: ##STR3## wherein R. sup. 1 is selected from the group consisting of straight chain alkyl groups having two to three carbon atoms, wherein R. sup. 2 is selected from the group consisting of straight chain alkoxy groups having three to six carbon atoms, and wherein the saturated ring has a trans conformation; and (c) at least one para-substituted phenyl benzoate ester represented by the formula: ##STR4## wherein R. sup.
