Asymmetric 1:2-chrome complexes of benzene-azo-naphthalene/naphthalene-azo-naphthalene acid dyes for leather
AssigneeCiba-Geigy Corporation
InventorsFabio Beffa, Alois Puntener, Peter Loew
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Abstract
Asymmetric 1:2-chrome complex dyes of the formula: ##STR1## wherein A is the radical of 1-hydroxynaphthalene or 2-hydroxynaphthalene, R.sub.1 is hydrogen, chlorine or methyl, R.sub.2 is hydrogen, nitro or chlorine, and Ka.sup.+ is a cation, and of the substituents X.sub.1, X.sub.2 and X.sub.3 one is an SO.sub.3 group, and the other two are hydrogen, X.sub.3 being hydrogen when R.sub.1 is chlorine and R.sub.2 is hydrogen, give blue shades on leather and other polyamides, which shades are lightfast and fast to wet processing.
Claims4
A metal-complex dye which corresponds to the formula I ##STR74## wherein A is the radical of 1-hydroxynaphthalene or 2-hydroxynaphthalene,
- R.sub.1 is hydrogen, chlorine or methyl, R.sub.2 is hydrogen, nitro or chlorine, and Ka.sup..sym. is a cation, and of the substituents
- X.sub.1, X.sub.2 and X.sub.3, one is an SO.sub.3 group, and the other two are hydrogen, X.sub.3 being hydrogen when R.sub.1 is chlorine and R.sub.2 is hydrogen.
Dependencies are inferred from the claim text.