Verfahren zur Herstellung von metallhaltigen, wasserunloeslichen Azofarbstoffen

摘要

The invention comprises the complex metal compounds of water-insoluble monoazo dyes of formula wherein the benzene radical a may be substituted other than by sulphonic or carboxylic acid groups and R is the residue of a coupling component linked in ortho-position to the hydroxyl group and free from sulphonic acid and carboxylic acid groups, with the exception of an arylamide of an aromatic or heterocyclic o-hydroxycarboxylic acid or of an acylacetic acid. The complexes are prepared by treating monoazo dyes of the above formula, obtained by coupling a diazotized 3-aminoindazole with a suitable component, with salts or complex compounds of iron, chromium, manganese, aluminium, uranium, cadmium, zinc or preferably, copper, cobalt or nickel. The complexes may also be formed on the fibre (see Division D1). The complexes may be used to dye textile materials, e.g. wool, silk, synthetic polyamide, polyurethane or polyester and acetylcellulose in a variety of shades. The preparation of copper, cobalt and nickel complexes is described in Examples 5 and 6.ALSO:Complex metal compounds of water-insoluble monoazo dyes of formula wherein the benzene radical a may be substituted other than by sulphonic or carboxylic acid groups and R is the residue of a coupling component linked in ortho-position to the hydroxyl group and free from sulphonic and carboxylic acid groups with the exception of an arylamide of an aromatic or heterocyclic o-hydroxycarboxylic acid or of an acylacetic acid are prepared on the fibre by the usual methods. Specified fibres are wool, silk, synthetic polyamide, acetylcellulose, polyvinyl alcohol and cellulose, particularly cotton. The metal-free dye may be applied to the fibre which is subsequently treated with the metallising agent, or the coupling component applied to the fibre which is then developed in a bath containing a diazotised 3-amino-indazole and a metallising agent. Specified metallising agents are salts and complex compounds of iron, chronium, uranium, manganese, aluminium, cadmium, zinc, or preferably, copper, cobalt or nickel. In Examples 1-4 and a Table the preparation of the complexes on cotton is described.