Process for dyeing leather with an aqueous bath containing sulfonated carbon black and black anionic dye
AssigneeCiba-Geigy Corporation
InventorsHans Altermatt, Alois Puntener, Peter Moser, Ernst Tempel
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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 a black anionic dye and a sulfonated carbon black. The leather dyeings obtained by this process have good allround fastness properties.
Claims20
A process for dyeing leather which comprises treating leather by the exhaust process with an aqueous liquor which contains a formulation comprising a black anionic dye selected from the group consisting of acid dyes, direct dyes and metal complex dyes and a sulfonated carbon black having a sulfur content of from 0.5 to 6 percent by weight;
- the weight ratio of anionic dye to carbon black being from 95:5 to 60:40.
A dye formulation comprising a black anionic dye selected from the group consisting of acid dyes, direct dyes and metal dyes and a sulfonated carbon black having a sulfur content of 0.5 to 6 percent by weight;
- the weight ratio of anionic dye to carbon black being from 95:5 to 60:40.
Dependencies are inferred from the claim text.