Compositions – Liquid crystal compositions – Containing pleochroic dye
Patent
1980-08-04
1981-12-29
Gron, Teddy S.
Compositions
Liquid crystal compositions
Containing pleochroic dye
260173, 350349, C09K 334, G02F 113, C09B 3116
Patent
active
043081614
ABSTRACT:
Novel yellow azo dye compositions and a liquid crystal composition containing the yellow azo dye composition are disclosed. The yellow azo dye composition, having terminal ester groups, has the general formula: ##STR1## wherein R and R' are acyl groups having the formula: ##STR2## and R.sub.2 is an alkyl or substituted alkyl wherein the alkyl has at least 4 carbon atoms, or R.sub.2 is an aryl, arylalkyl, substituted aryl or substituted arylalkyl. When the yellow azo dichroic dyes are used alone, or in combination with other dyes, as a guest in a host liquid crystal material, they form a novel liquid crystal composition for use in liquid crystal displays. The disclosure also embraces a method of improving the black color of dichroic dyes for use in black liquid crystal displays, wherein a dye composition having a mixture of dichroic dyes of various colors and containing at least one yellow azo dichroic dye, as described above, is added to a host liquid crystal material. The mixture of dichroic dyes of various colors must be one which absorbs radiation in the spectral range of about 400-700 nm to produce the substantially black color for use in black liquid crystal displays.
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Aftergut Siegfried
Cole Herbert S.
Davis James C.
General Electric Company
Gron Teddy S.
Krauss Geoffrey H.
Snyder Marvin
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