Process for the dyeing of leather with dye mixtures

US5486213A · kind A · utility

Assignee

• Ciba-Geigy · US

Inventors

• Peter Moser · Schlagturn, AT
• Campbell Page · Weil am Rhein, DE
• Alois Puntener · Rheinfelden, CH

Key dates

• Filing date: Jun 22, 1993
• Grant date: Jan 23, 1996
• Expiry date: Jun 22, 2013

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C09B67/0042
• WIPO field: Basic materials chemistry
• WIPO sector: Chemistry

Abstract

Dye mixtures comprising at least two metal-free dyes, one of which contains two to eight sulfo groups and the other three to eight sulfo groups, the mixture comprising at most one dye having two sulfo groups, are used for the dyeing of leather. Preferably, a trichromatic dye mixture comprising at least one yellow dye, at least one red dye and at least one blue dye is used. Leather can be dyed with these dye mixtures in brilliant shades.