Dystar Textilfarben Gmbh & Co. Deutschland Kg

Wolfgang Schrott

Norbert Grund

Thomas Bechtold

Georg Schnitzer

Franz S&uuml;tsch

Rudolf Kr&uuml;ger

Eduard Burtscher

Peter Maier

Wolfgang Hiebsch

Hans-Peter Maier

Mediator systems obtainable by mixing one or more salts of a metal capable of forming a plurality of valence states with at least one amino-containing complexing agent (K1) and at least one hydroxyl-containing but amino-devoid complexing agent (K2) in an alkaline aqueous medium, wherefor the complexing agents may be present as salts and the molar ratio of K1 to metal ion is from 0.1:1 to 10:1 and the molar ratio of K2 to metal ion is from 0.1:1 to 5:1 are useful for dyeing cellulosic textile material.

Mediator systems based on mixed metal complexes, used for reducing dyes

Mediator systems obtainable by mixing a salt of an electrochemically active complexing metal (M1) capable of forming a plurality of valence states with a hydroxyl-containing complexing agent, which may likewise be present as salt, and with a salt of an electrochemically inactive complexing metal (M2) in an alkaline aqueous medium, wherefor the molar ratio of metal ion M2 to metal ion M1 is from 0.8:1 to 2:1 are useful for reducing dyes and dyeing cellulosic textile material.

From 5 to 60% by weight aqueous alkaline solutions of reduced indigoid dyes are prepared by reducing the indigoid dye electrochemically in the presence of a mediator.

Method for producing aqueous alkaline solutions or reduced indigoid dyes

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Böhl-Iggelheim, Germany

Wolfgang Schrott