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US 4,154,746 AGranted
Anthraquinone amino pleochroic dyes
AssigneeMinnesota Mining and Manufacturing Company
InventorWilliam A. Huffman
Life of this patent
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Abstract
Anils of 1,4- and 1,8-diaminoanthraquinone with p-alkyl- and p-alkoxybenzaldehyde are found to be pleochroic dyes which form guest-host combinations with dielectrically positive anisotropic nematic liquid crystals. These combinations are of value in electro-optical display devices.
Claims3
A pleochroic dyestuff of the general formula ##STR7## where C.sub.14 H.sub.6 O.sub.2 is an anthraquinone radical having valences at 1,4 or 1,8 and X is nitro, cyano, phenyl, alkyl of 1-20 carbon atoms, alkoxy of 1-20 carbon atoms or di(lower alkyl)amino containing alkyl groups of 1-4 carbon atoms.
Dependencies are inferred from the claim text.