Liquid crystal esters
AssigneeHoffmann-La Roche Inc.
InventorsArthur Boller, Hanspeter Scherrer
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Abstract
Liquid crystal substances or compounds of the formula ##STR1## wherein R is as hereinafter set forth, AS WELL AS COMPOSITIONS AND ELECTRO-OPTICAL APPARATUSES CONTAINING THEM ARE DESCRIBED.
Claims10
A nematic composition which comprises two or more compounds of the formula ##STR12## wherein R is straight-chain lower alkyl of 4 to 8 carbon atoms.
A nematic composition which comprises an ester of the formula ##STR13## wherein R is straight-chain lower alkyl of 4 to 8 carbon atoms, or mixtures thereof and one or more nematic compounds having a positive anisotropy.
A nematic composition which comprises an ester of the formula ##STR14## wherein R is straight-chain lower alkyl of 4 to 8 carbon atoms, or mixtures thereof, and a Schiffs' base of the formula ##STR15## wherein R' is straight-chain lower alkyl of 2 to 8 carbon atoms, straight-chain lower alkoxy of 4 to 7 atoms, or straight-chain lower alkanoyloxy of 2 to 8 carbon atoms.
A dielectric for electro-optical purposes which comprises two or more compounds ##STR16## wherein R is straight-chain lower alkyl of 4 to 8 carbon atoms, or mixtures thereof.
A dielectric for electro-optical purposes, which comprises a nematic ester of the formula ##STR17## wherein R is straight-chain lower alkyl of 4 to 8 carbon atoms, or mixtures thereof and one or more nematic compounds having positive anisotropy.
Dependencies are inferred from the claim text.