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US 4,061,587 AGranted
Liquid crystalline cinnamic acid esters
AssigneeHoffmann-La Roche Inc.
InventorsHanspeter Scherrer, Arthur Boller
Life of this patent
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Abstract
Liquid crystalline alkylcinnamic acid p'-cyanophenyl esters, useful, for example, for electro-optical purposes, are described.
Claims21
An electro-optical cell containing a nematic composition which comprises a nematic compound of the formula ##STR14## wherein R is straight-chain alkyl of 1 to 8 carbon atoms, or mixtures thereof.
A nematic composition for electro-optical purposes, which comprises a compound of the formula ##STR15## wherein R is straight-chain alkyl of 1 to 8 carbon atoms, or mixtures thereof, and one or more other positive anisotropic nematic compounds.
Dependencies are inferred from the claim text.