PLEOCHROITISCHE FARBSTOFFE ENTHALTENDE FLUESSIGKRISTALLMASSEN

Liquid crystal compositions having positive dielectric anisotropy comprise at least one nematic liquid crystal material having positive dielectric anisotropy and are characterized by containing a pleochroic dye of the general formula: wherein a is 1 or 0; provided that when a = 1, n = 0 m is an inte...

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Bibliographic Details
Main Authors L. BENHAM,JUDITH, A. HUFFMAN,WILLIAM
Format Patent
LanguageGerman
Published 04.09.1980
Edition3
Subjects
ADHESIVES
CHEMISTRY
DYES
LAKES
MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FORELSEWHERE
METALLURGY
MISCELLANEOUS APPLICATIONS OF MATERIALS
MISCELLANEOUS COMPOSITIONS
MORDANTS
NATURAL RESINS
ORGANIC DYES OR CLOSELY-RELATED COMPOUNDS FOR PRODUCING DYES
PAINTS
POLISHES
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Summary:Liquid crystal compositions having positive dielectric anisotropy comprise at least one nematic liquid crystal material having positive dielectric anisotropy and are characterized by containing a pleochroic dye of the general formula: wherein a is 1 or 0; provided that when a = 1, n = 0 m is an integer from 1 to 4, R represents -CH3, -OCH3 or -H, and Y represents, independently, -NH2, -NO2, -OH, -Cl or -F, and when a = 0, Y represents, independently, -NH2, -NO2 or -OH; Q is independently, or and is present only in one or more of positions 1, 4, 5 and 8; R' and R'' independently represent hydrogen or a nonionic substituent; m is 0, 1 or 2; n is an integer from 1 to 4; and m + n is 4 or less; provided, that when Q is then n = 2, m = 0, and S-Q is present only in positions 1 and 4, 1 and 5, 1 and 8, 4 and 5 or 5 and 8. The compositions are used in electro-optical devices, e.g. displays.
Bibliography:Application Number: DE19803006744