Liquid crystalline isonitriles
AssigneeHoffmann-La Roche Inc.
InventorsArthur Boller, Hanspeter Scherrer
Life of this patent
Estimating the term…
Abstract
Liquid crystal substances or compounds of the formula ##STR1## wherein X is ##STR2## and R is straight-chain alkyl, straight-chain alkoxy, straight-chain alkanoyloxy or p-alkyloxycarbonyloxy, As well as compositions and electro-optical apparatuses containing them, are described.
Claims6
A nematic composition which comprises two or more compounds of the formula ##STR40## wherein X is ##STR41## and R is straight-chain alkyl of 1-7 carbon atoms, straight-chain alkoxy of 1-7 carbon atoms, straight-chain alkanoyloxy of 1-7 carbon atoms or p-alkyloxycarbonyloxy wherein the alkyloxy group is straight-chain alkyloxy of 1-7 carbon atoms.
A nematic composition which comprises a compound of the formula ##STR42## wherein X is ##STR43## and R is straight-chain alkyl of 1-7 carbon atoms, straight-chain alkoxy of 1-7 carbon atoms, straight-chain alkanoyloxy of 1-7 carbon atoms or p-alkyloxycarbonyloxy wherein the alkyloxy group is straight-chain alkyloxy of 1-7 carbon atoms,
- or mixtures thereof and one or more nematic compounds having a positive anisotropy.
A nematic composition which comprises a compound of the formula ##STR44## wherein X is ##STR45## and R is straight-chain alkyl of 1-7 carbon atoms, straight-chain alkoxy of 1-7 carbon atoms, straight-chain alkanoyloxy of 1-7 carbon atoms or p-alkyl-oxycarboxyloxy wherein the alkyloxy group is straight-chain alkyloxy of 1-7 carbon atoms,
- or mixtures thereof, and a compound of the formula ##STR46## wherein R.sub.2 is straight-chain alkyl with 4 to 7 carbon atoms.
A nematic composition which comprises a compound of the formula ##STR47## wherein X is ##STR48## and R is straight-chain alkyl of 1-7 carbon atoms, straight-chain alkoxy of 1-7 carbon atoms, straight-chain alkanoyloxy of 1-7 carbon atoms or p-alkyl-oxycarbonyloxy wherein the alkoxy group is straight-chain alkyloxy of 1-7 carbon atoms,
- or mixtures thereof, and a compound of the formula ##STR49## wherein R.sub.1 is straight-chain alkyl with 2 to 8 carbon atoms, straight-chain alkoxy with 4 to 7 carbon atoms or straight-chain alkanoyloxy with 2 to 8 carbon atoms.
A nematic composition which comprises a compound of the formula ##STR50## wherein X is ##STR51## and R is straight-chain alkyl of 1-7 carbon atoms, straight-chain alkoxy of 1-7 carbon atoms, straight-chain alkanoyloxy of 1-7 carbon atoms or p-alkyloxycarbonyloxy wherein the alkyloxy group is straight-chain alkyloxy of 1-7 carbon atoms,
- or mixtures thereof, and a compound of the formula ##STR52## wherein R.sub.3 is straight-chain alkyl with 4 to 8 carbon atoms or straight-chain alkoxy with 5 to 8 carbon atoms.
A dielectric for electro-optical purposes, which comprises a compound of the formula ##STR53## wherein X is ##STR54## and R is straight-chain alkyl of 1-7 carbon atoms, straight-chain alkoxy of 1-7 carbon atoms, straight-chain alkanoyloxy of 1-7 carbon atoms or p-alkyloxycarbonyloxy wherein the alkyloxy group is straight-chain alkyloxy of 1-7 carbon atoms,
- or mixtures thereof and one or more nematic compounds having a positive anisotropy.
Dependencies are inferred from the claim text.