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    • 7. 发明授权
    • Novel yellow azo dyes and dichroic liquid crystal composition made
therewith
    • 新的黄色偶氮染料和二色液晶组合物
    • US4308164A
    • 1981-12-29
    • US175002
    • 1980-08-04
    • Siegfried AftergutHerbert S. Cole
    • Siegfried AftergutHerbert S. Cole
    • C09B35/04C09B43/20C09K19/60C09K3/34G02F1/13
    • C09B35/04C09B43/20C09K19/601Y10S534/01
    • 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 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.
    • 公开了新的黄色偶氮染料组合物和含有黄色偶氮染料组合物的液晶组合物。 具有末端酯基的黄色偶氮染料组合物具有以下通式:其中R和R'是具有下式的酰基:其中R 2是烷基或取代的烷基,其中烷基具有至少4个碳原子 ,或R 2为芳基,芳基烷基,取代的芳基或取代的芳基烷基。 当黄色偶氮二色性染料用作主体液晶材料中的客体时,它们形成用于液晶显示器的新型液晶组合物。 本公开还包括改进用于黑色液晶显示器中的二色性染料的黑色的方法,其中将具有各种颜色的二色性染料和至少一种如上所述的黄色偶氮二色性染料的混合物的染料组合物加入到 主体液晶材料。 各种颜色的二色性染料的混合物必须是在约400-700nm的光谱范围内吸收辐射的混合物,以产生用于黑色液晶显示器的基本黑色。