Sandoz Gmbh

Michel Dien

Herbert Holliger

Willi Egli

A process for the dyeing or printing of leather with anionic metal complex dyes wherein the metal complex dyes are metal complexes of metallizable monoazo dyes or metallizable monoazomethine dyes or both metallizable monoazo and monoazo methine dyes and before the application of the dye or after the application of the dye or both before and after the application of the dye the leather is treated with a product (P) or a mixture of products (P) or an acid addition product thereof, product (P) being a polymer obtainable by reaction of

Dyeing and printing of leather

Dye compositions containing (a) at least one blue sulpho group-containing triphendioxazine dye and (b) at least one blue sulpho group-containing anthraquinone dye and preferably (c) lignine sulphonic acid or a salt of it and optionally (d) a non-ionic blending agent are outstandingly suitable for the level and fast dyeing of leather substrates.

Compositions for the dyeing of leather

Tanned leather is penetration-dyed from aqueous medium with hydrospluble sulpho group-containing sulphur dyes in the presence of dye-substantive uptake assistants and may be used as a substrate for further coloration processes, mainly dyeings and printings, in particular with anionic or basic dyes; in a variation of the process for overdyeing, in particular of thin leathers, the penetration-dyeing may also be carried out in the absence of the dye-substantive uptake assistant.

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Rixheim, France

Michel Dien