Liquid crystalline compositions
AssigneeBBC Brown, Boveri & Company, Limited
InventorMaged A. Osman
Life of this patent
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Abstract
Liquid crystalline compositions, especially for displays with a twisted nematic phase, comprising at least one compound of the formula ##STR1## wherein X=H, --CHO or --CH.sub.3, R.sup.1 =C.sub.1 --C.sub.10 alkyl, R.sup.2 is a monovalent organic group, for example, --CN; and Y is a single bond or one of the groups --COO-- or ##STR2## The compositions show a high positive dielectric anisotropy (.DELTA..epsilon.), a high .DELTA.n, and a low viscosity, and the mixture system may comprise relatively few components.
Claims11
A liquid crystalline composition, especially for liquid crystal displays with a twisted nematic phase, comprising one liquid crystalline or potentially liquid crystalline compound and at least one compound of the formula (1) ##STR16## wherein X is a hydrogen atom, a formyl group or a methyl group;
- R.sup.1 is a C.sub.1 -C.sub.10 alkyl group, R.sup.2 is selected from the group consisting of C.sub.1 -C.sub.10 alkyl radicals, C.sub.1 -C.sub.10 alkoxy radicals, C.sub.2 -C.sub.10 acyloxy radicals, nitrile, nitro, methylsulfonyl and trifluoromethyl;
- and Y is a single bond between the cyclohexyl and aryl radicals or Y is a carbonyloxy group or a p-phenylene residue.
A compound of the formula (1) ##STR19## wherein X is a hydrogen atom, a formyl group or a methyl group;
- R.sup.1 is a C.sub.1 -C.sub.10 alkyl group, R.sup.2 is selected from the group consisting of C.sub.1 -C.sub.10 alkyl radicals, C.sub.1 -C.sub.10 alkoxy radicals, C.sub.2 -C.sub.10 acyloxyl radicals, nitrile, nitro, methylsulfonyl and trifluoromethyl;
- and Y is a single bond or Y is a carbonyloxy group or a p-phenylene residue.
Dependencies are inferred from the claim text.