PROCESS FOR THE SIMULTANEOUS TANNING AND DYEING OF COLLAGEN CONTAINING FIBROUS MATERIAL

摘要

A process for the simultaneous tanning and dyeing of collagen containing fibrous material, wherein the said material is treated with a liquor containing at least one reactive dyestuff selected from the group of formula (1): A₁-(Z₁)_2-3 and (2)and wherein A₁, A₂ and A₃ are each independently of the others the radical of a monoazo, polyazo, metal-complexed azo, anthraquinone, phthalocyanine, formazan or dioxazine chromophore having at least one sulfo group, B is an organic bridge member, Q₁, Q₂, Q₃ and Q₄ are each independently of the others hydrogen or unsubstituted or substituted C₁-C₄alkyl, G₁ und G₂ are halogen, 3-carboxypyridin-1-yl or 3-carbamoylpyridin-1-yl, (Z₁)_2-3 is 2 to 3 identical or different fiber reactive radicals, Z₂ and Z₃ are each independently of the other identical or different fiber reactive radicals, and b is the number 0 or 1, by combining two steps of leather production, tanning and dyeing, into a single step, thus, preserving resources and reducing the environmental impact.