Dyeing leather with water-insoluble sulphur dyes
AssigneeCasella Aktiengesellschaft
InventorsWolfgang Bauer, Hubert Kruse, Gert Nagl, Jan-Hilbert Mast, Lothar Schlosser
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Abstract
The present invention relates to a process for dyeing leather by the exhaust method, characterized in that water-insoluble sulphur dyes in dispersed form are used.
Claims18
Process for dyeing leather by the exhaust method, characterized in that water-insoluble sulphur dyes in dispersed form are used.
Process for dyeing leather by the exhaust method, comprising using water-insoluble sulphur dyes in dispersed form in an aqueous liquor at a temperature of from 20.degree. to 100.degree. C. and a pH-value of from 3.8 to 5.5.
Process for dyeing leather by the exhaust method, comprising using 0.5 to 8%, based on the shaved weight of the leather, of water-insoluble sulphur dyes in dispersed form in an aqueous liquor which, based on the shaved weight of the leather, contains from 20 to 400% of water at a temperature of from 20.degree. to 100.degree. C. and a pH value of from 3.8 to 5.5.
Dependencies are inferred from the claim text.