Bayer Aktiengesellschaft

Dieter Wiegner

Horst Brandt

Manfred Hoppe

Reinhold Hornle

Hans-Gunter Otten

Gunter Gehrke

Rolf Muders

Heinz Dietrich Jordan

Wolf-Dieter Elsner

Richard Buchele

Klaus-Peter Sagner

Mixtures of dyestuffs of the formulae I to IV ##STR1## wherein the radicals have the meanings customary in dyestuff chemistry, are excellent substitute products for the expensive anthraquinone dyestuff Disperse Blue 56.

Mixtures of blue azo disperse dyestuffs

Mixtures of at least two different dyestuffs of the formulae ##STR1## in which the symbols have the meanings mentioned in the text represent a low-priced replacement for the known anthraquinone dyestuff Disperse Red 60. In the dyeing of mixed yarn, they are even superior with respect to sublimation fastness and cotton staining.

Red mixtures of disperse azo dyestuffs

Mixtures of disperse dyestuffs

Mixed crystals of dyestuffs of the formula I ##STR1## wherein R denotes alkyl and

Dyestuff mixtures, a process for their preparation and a process for

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Odenthal, Germany

Dieter Wiegner