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.
Type:
Grant
Filed:
January 8, 1979
Date of Patent:
September 30, 1980
Assignee:
Hughes Aircraft Company
Inventors:
Frederick G. Yamagishi, Leroy J. Miller, John E. Jensen, J. David Margerum
Abstract: Intrinsically nonwettable polypropylene battery separators are rendered wettable by treating them with polybenzimidazole.Polybenzimidazole (PBI) treated polypropylene (PP) separators exhibited excellent thermal and chemical stabilities, show excellent electrolyte retention, and are gas permeable.
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