Process for dyeing cellulosic textile material with disperse dyes
AssigneeCiba-Geigy Corporation
InventorsWolfgang Schlenker, Peter Liechti, Dieter Werthemann, Angelo D. Casa
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Abstract
Cellulosic textile materials can be dyed with disperse dyes from supercritical CO.sub.2 by treating the textile materials with an auxiliary that promotes dye uptake, typically polyethylene glycol.
Claims20
A process for dyeing cellulose textile material with disperse dyes, which comprises pretreating the textile material at least 5% by weight, based on the weight of the textile material of an auxiliary that promotes dye uptake and subsequently dyeing the pretreated material with a disperse dye under pressure and at a temperature of at least 90 degrees celsius from supercritical CO.sub.2, said auxiliary being selected from the group consisting of a polyalkylene glycol, an alkanolamine and an aromatic compound with several hydroxyl groups.
Dependencies are inferred from the claim text.