Bayer Aktiengesellschaft

Martin Michna

Hermann Henk

Karl-Josef Herd

Manfred Hoppe

Frank-Michael Stohr

Dietrich Tegtmeyer

Peter Wild

Karin Hassenruck

Artur Haus

Karl J Herd

Rolf Richter

Werner Zillger

Hans-Werner Zillger

A process has been found for dyeing and printing pater, wood, plastic or metal, in which dyestuffs which, in the form of the free acid, correspond to the formula (I) ##STR1## wherein A denotes a phenol radical which is optionally substituted by alkyl or cycloalkyl and n represents 0 or 1,

Dyestuffs for printing inks

The new printing inks, comprising at least one dyestuff of the formula (I) ##STR1## are suitable for printing the most diverse carrier materials, in particular by means of an ink jet recording system.

Fiber reactive azo dyestuffs of the formula ##STR1## in which R=H or C.sub.1 -C.sub.6 alkyl, which can be substituted with OH, Hal, SO.sub.3 H or OSO.sub.3 H;

Fibre reactive azo dyestuffs

Preparations of water-soluble reactive dyestuffs containing pyridine derivatives of the formula ##STR1## or salts of, in which the substituents have the meanings given in the description, are highly suitable for the dyeing of cellulose materials.

Reactive dyestuff preparations containing pyridine derivatives

By adding boric acid or salts of boric acid before or during the pressure permeation of anionic dyestuff solutions, the filtration flux is substantially increased, resulting in a low-cost process, due to the shorter plant time required.

Process for the preparation of stable dyestuff solutions: pressure

Stable aqueous solutions of anionic dyestuffs, preferably reactive dyestuffs, are obtained at very low costs by pressure permeation, if the feed solution for the pressure permeation is prepared by stirring the optionally dried presscake or the suspension of the crude dyestuff in an electrolyte solution.

Preparation of stable anionic dyestuff solutions: pressure permeation of

The invention provides new reaction dyestuffs of the formula ##STR1## where n and m are each 0 or 1 such that n+m=1 or 2 and where

Aminonaphthol bisazo reactive dyes

Process for the preparation of 1-aminobenzene-2-sulphonic acids of the formula ##STR1## wherein R.dbd.H or a substituent and

Process for the preparation of 1-aminobenzene-2-sulphonic acids

Use of mono-copper complexes of dyestuffs of the formula ##STR1## wherein X is H or SO.sub.3 H and

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Pulheim, Germany

Martin Michna