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AssigneeCiba-Geigy Corporation
InventorsBernard Chambon, Horst H. Jager, Rudiger Oxenius, Alois Puntener
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The invention relates to a process for the preparation of 1:2 chromium, 1:2 cobalt, 1:2 nickel or 1:2 iron complex azo dyes diazotisation, coupling and metallizing, without isolation of the coupling product, which process comprises diazotizing at least one amine of the benzene or naphthalene series in aqueous solution and coupling the diazonium compound so obtained to at least one coupling component of the benzene or naphthalene series or of the heterocyclic series, such that the azo dye obtained as intermediate contains groups suitable for metal complex formation, and carrying out the diazotization or coupling in the presence of a chromium, cobalt, nickel or iron donor. The dyes obtained by the process of the invention are suitable for dyeing in particular wool or synthetic textile polyamide fibre materials as well as leather, and for use as wood mordant dyes.
A process for the preparation of 1:2 chromium, 1:2 cobalt, 1:2 nickel or 1:2 iron complex azo dye by diazotization, coupling and metalizing without isolation of the coupling product, which process comprises diazotising at least one amine of the benzene or naphthalene series in aqueous solution and coupling diazonium compound so obtained at a temperature in the range of 55.degree. to 85.degree. C. least one coupling component of the benzene or naphthalene series or of the heterocyclic series, such that the azo dye obtained as intermediate contains groups suitable for metal complex formation, and carrying out the diazotization or coupling in the presence of a chromium, cobalt, nickel or iron donor, and wherein the molar ratio of the sum of the amines and the molar ratio of the sum of the coupling components to the metallizing agent is 1.6:1.0 to 2:1.
Dependencies are inferred from the claim text.