Novel yellow azo dyes and dichroic liquid crystal compositions m

Details Novel yellow azo dyes and dichroic liquid crystal compositions m Novel yellow azo dyes and dichroic liquid crystal compositions m

1980-12-08

1981-12-29

Gron, Teddy S.

Compositions

Liquid crystal compositions

Containing pleochroic dye

260173, 350349, C09K 334, G02F 113, C09B 3116

Patent

active

043081622

ABSTRACT:
Novel yellow azo dye compositions and novel liquid crystal compositions containing the yellow azo dye composition. The yellow azo dye composition, having terminal ester groups, has the general formula: ##STR1## wherein R and R' are alkyl or substituted alkyl wherein the alkyl has at least 4 carbon atoms, 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. An invention 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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