Hoechst Aktiengesellschaft

Joachim Steinbach

Manfred Hahnke

Walter Birke

Erich Feess

Claus Schuster

Ullrich Saalfrank

Gerd Krauzpaul

Cellulose fibers are dyed ecologically soundly with sulfur black dyes by the pad-dyeing process by avoiding sulfides as reducing agent by replacing them by a dithionite-based mixture with at least one reducing sugar. A high color yield, a deep black shade and good reproducibility are ensured. The preferred reducing sugar is glucose.

Pad-dyeing of cellulose fibers with sulfur black dyes: mixture of

Process for the continuous dyeing of textile webs made from cellulose fibers or wool, or mixtures containing such fibers, with reactive or sulfur dyestuffs in reduced form, or with reactive or acid dyestuffs, which comprises preheating the textile material to temperatures of from 97.degree. to 104.degree. C. by means of IR radiators or microwaves while maintaining a residual moisture corresponding at least to the water retention amount (normal humidity) of the fibers, and subsequently treating it with steam for 10 to 300 seconds without applying additional pressure, in order to fix the dyestuffs.

Process for the continuous dyeing of textile webs pre-heated with

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Frankfurt am Main, Germany

Joachim Steinbach