Dyeing and printing of cellulosic fibre materials with vat dyes with mono- or di-hydroxyacetone as reducing agent
AssigneeCiba-Geigy Corporatioin
InventorsWalter Marte, Paul Rys
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Abstract
Process for dyeing and printing cellulosic fiber materials with vat dyes in the presence of enediols as reducing agents and alkali, using in addition small amount of organic water-miscible solvents, for example low molecular weight alcohols, when reducing the vat dyes. The vatting of the vat dyes proceeds uniformly and completely within a relatively short time, and the resulting vat dyes are reproducible and notable for high levelness and fastness properties.
Claims15
A process for dyeing and printing cellulosic fibre materials with vat dyes in the presence of C.sub.2 -C.sub.6 -alpha-hydroxyketones or C.sub.2 -C.sub.6 -alpha-hydroxyaldehydes as reducing agents, alkali, and in addition organic water-miscible solvents wherein the organic water-miscible solvents are lower molecular weight alcohols, ketones, ethers, acetals, glycols, glycol ethers, thioglycols, nitriles, pyridines, lactams, amides, ureas, sulfones or sulfoxides or low molecular weight alkanolamines.
Dependencies are inferred from the claim text.