- Reactive trisazo dyes
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The present invention refers to trisazo dyes of the formula I or an alkali metal salt thereof; wherein: Ar1 is an optionally substituted arylene group; Ar2 is an optionally substituted aryl group; R1, R2, R3, R4, X1 and X2 are defined as given in claim 1; each of D1 and D2, independently, is a chromophore group of the formula wherein the variables are defined as given in claim 1, a process for their preparation and a process for colouring fibre material containing a group reactive with a reactive dye.
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- Reactive diamine-linked azo dyes
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Reactive dyes containing two units each comprising a monoazo or disazo chromophore linked to a triazinylamino group, each of which units is linked by a diamine unit disposed between the triazine rings.
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- Liquid crystal coupled dichroic dyes
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Modifiers for pleochroic, and in particular dichroic, dyes in which a linking group contains a spacing chain of at least four linearly linked atoms that is coupled at one end to a liquid crystal moiety and is connectable at the other end to a nonionic dye chromophore to a nonionic dye to form a modified dichroic dye, to such modified dye compounds, and to their use in guest-host compositions and devices containing the dye compounds, are disclosed.
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