Process for dyeing natural protein fibres with metallic azo dyes
AssigneeCiba-Geigy Corporation
InventorGerhard Back
Life of this patent
Estimating the term…
Abstract
The present invention relates to a process for dyeing or printing natural protein fibres in deep, black, brown, and navy blue shades, wherein protein fibres are dyed from an aqueous liquor, in the presence of a levelling agent, with a metal complex of the formula ##STR1## wherein R.sub.1 represents hydrogen, an alkyl, aralkyl or aryl radical, R.sub.2 represents an acryloyl, acetyl or a propionyl radical which is substituted by one or two halogen atoms, Me represents a chromium-III or cobalt-III ion and X represents hydrogen, nitro, chlorine, methyl, methoxy, acetylamino, chloroacetylamino or propionylamino, or the dyestuff is transferred from a support by transfer printing.
Claims6
A process for dyeing or printing natural protein fibers in deep shades of black, brown or navy blue, comprising the step of applying to the natural protein fibers an aqueous liquor containing a levelling agent and a dye of the formula ##STR5## wherein R.sub.1 is hydrogen or methyl, R.sub.2 is dibromopropionyl, dichloropropionyl, alpha-bromoacryloyl, alpha-chloroacryloyl or chloroacetyl, and X is hydrogen, nitro, chlorine, methoxy, acetylamino or chloroacetylamino.
Dependencies are inferred from the claim text.