Ortho-cyanophenyl biphenylcarboxylate liquid crystal esters and mixtures thereof
AssigneeHughes Aircraft Company
InventorsFrederick G. Yamagishi, Leroy J. Miller, John E. Jensen, J. David Margerum
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Abstract
A number of alkyl and alkoxy-substituted ortho-cyanophenyl biphenylcarboxylate esters have been prepared for use as components for nematic liquid crystal mixtures which can be used in homeotropically aligned, field effect display devices or in dynamic scattering displays. These materials have large negative dielectric anisotropies and high birefringence.
Claims7
Alkyl and alkoxy-substituted ortho-cyanophenyl biphenylcarboxylate esters whose structural formula are:
- ##STR3## wherein R and R' are hydrogen or an alkyl group of the formula C.sub.n H.sub.2n+1 and R" is an alkyl group of the formula C.sub.n H.sub.2n+1 where n ranges from 1 to 8.
A nematic liquid crystal mixture exhibiting a high birefringence and a large negative dielectric anisotropy comprising a compound whose formula is ##STR4## wherein R' and R" are alkyl groups whose formula are C.sub.n H.sub.2n+1 where n ranges from 1 to 8, which possess a large negative dielectric anisotropy, and a nematic liquid crystal mixture that possesses a positive dielectric anisotropy.
Dependencies are inferred from the claim text.