Dyeing leather: exhaustion process using combination of pigment dispersion and aqueous solution of water-soluble sulfur dye
AssigneeHoechst Aktiengesellschaft
InventorsPeter Weinheimer, Norbert Ambrecht, Lothar Schlosser
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Abstract
The process for dyeing leather by the exhaust method comprises allowing a pigment dispersion and an aqueous solution of sulfur dye to act on the conventionally pretreated leather in one step or in succession. It affords a high depth of shade and a high brilliance which are not achieved by using the pigment or the sulfur dye on its own.
Claims15
A process for dyeing leather by the exhaust method, which comprises allowing a pigment dispersion consisting essentially of a pigment, a dispersant and water and an aqueous solution of sulfur dye to act on the leather in one step or in succession.
A process for dyeing leather by the exhaust method, which comprises
- allowing a pigment dispersion comprising 10 to 60% by weight of pigment, 2 to 30% by weight of dispersant, 0 to 30% by weight of solvent, 0 to 5% by weight of preservative, and 30 to 70% by weight of water, and an aqueous solution of sulfur dye containing, based on the shaved weight of the leather, 20 to 400% by weight of water and 0.5 to 8% by weight of sulfur dye, to act on the leather in one step or in succession.
A process for dyeing leather by the exhaust method, which comprises allowing a pigment dispersion consisting essentially of a pigment, a dispersant and water and an aqueous solution of sulfur dye to act on the leather in succession.
Dependencies are inferred from the claim text.