Process for dyeing leather: aqueous bath containing mixture of carbon black and acid dye, direct dye or metal complex dye
AssigneeCiba-Geigy Corporation
InventorsBruno Martinelli, Markus Ghezzi, Gunter Streicher
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Abstract
There is disclosed a process for dyeing leather by the exhaust process, which comprises treating leather with an aqueous liquor which contains a formulation comprising an anionic dye and a pigment. The leather dyeings obtained by this process have good allround fastness properties.
Claims16
A process for dyeing leather, which comprises treating leather by the exhaust process with an aqueous liquor which contains a formulation consisting essentially of a black anionic dye selected from the group consisting of acid dyes, direct dyes and metal complex dyes and a carbon black pigment;
- the weight ratio of anionic dye to black pigment being from 95:5 to 50:50.
A dye formulation consisting essentially of a black anionic dye selected from the group consisting of acid dyes, direct dyes and metal complex dyes and a carbon black pigment in a weight ratio of 95:5 to 50:50.
Dependencies are inferred from the claim text.