Process for the trichromatic dyeing of leather

Details Process for the trichromatic dyeing of leather Process for the trichromatic dyeing of leather

D - Textiles, Paper

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8/6

D06P 3/32 (2006.01) C09B 45/16 (2006.01) C09B 55/00 (2006.01) C09B 67/22 (2006.01) D06P 1/10 (2006.01) D06P 3/30 (2006.01)

Patent

CA 1290104

PROCESS FOR THE TRICHROMATIC DYEING OF LEATHER Abstract of the Disclosure A process for trichromatic dyeing of leather with a mixture comprising a yellow, a red and a blue dye, said yellow dye and said red dye each being of the formula Image (I) wherein Z are nitrogen or a CH group, A and C are radicals of the : benzene or naphthalene series, B and D are the radicals of a coupling component if Z is nitrogen, X are oxygen or -NR-group, Me is chromium or cobalt,: Y is the SO3H, COOH or PO3H2 group; p is 1 or 2 and n is an integer from 1 to 6, which process comprises the use of an aqueous dye bath which contains a grey dye of the formula Image (II) wherein R1 and R3 are hydrogen or sulfo, A1 and A2 are the radicals of 1- or 2-hydroxynaphthalene, R2 and R4 are hydrogen or a group of the formula -CO-(O)m-E in which E is C1-C5 alkyl and m is 0 or 1, and Ka? is a cation. Irrespective of the type of leather, trichromatic mixtures containing said dyes produce level dyeings which are distinguished by a particularly good lightfastness.

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