Hair-reserving dyeing of wool- and fur-bearing skins
AssigneeSandoz Ltd.
InventorRudolf Seitz
Life of this patent
Estimating the term…
Abstract
A hair-reserving penetration dyeing of the leather side of wool- or fur-bearing skins is obtained by dyeing the wooled or fur skins in aqueous medium with hydrosoluble sulpho-group-containing sulphur dyes (a) in the presence of dye-substantive uptake assistant (b) and of non-ionic and/or anionic hydrophilic dispersants (c) and optionally in the presence of leather fatting agents (d).
Claims29
A process for dyeing the leather side of a tanned wool- or fur-bearing skin which comprises dyeing said skin in an aqueous medium with (a) a hydrosoluble sulpho group-containing sulphur dye or a mixture of such dyes in the presence of (b) a dye-substantive uptake assistant or a mixture of such assistants and (c) a non-ionic or anionic hydrophilic dispersant or mixture of such dispersants, there being employed 2-200 parts by weight of (b) and 2-500 parts by weight of (c) per 100 parts by weight of (a).
Dependencies are inferred from the claim text.