Process for the preparation of solutions of cationic polyazo dyestuffs

Abstract

To prepare concentrated solutions of cationic polyazo dyestuffs of the formula ##STR1## in which R represents hydrogen or methyl and R.sup.1 represents an alkyl radical which has 1 to 3 carbon atoms and is optionally substituted by hydroxyl, alkoxy or halogen, and mixing coupling products thereof with aromatic monoamines, diaminobenzenes of the general formula ##STR2## in which R has the abovementioned meaning, if appropriate mixed with up to 30 mol % of aromatic monoamines of the formula ##STR3## in which R.sup.2 represents hydrogen, C.sub.1 - to C.sub.4 -alkyl, C.sub.1 - to C.sub.4 -alkoxy or C.sub.1 - to C.sub.4 -acylamino and n denotes a number from 1 to 3, are dissolved in aliphatic carboxylic acids which have 2 to 4 carbon atoms and can optionally be substituted by halogen, hydroxyl or alkoxy, and are reacted with 0.5 to 0.75 mol of a salt or ester of nitrous acid per mol of diamine at 0.degree. to 30.degree. C.

Dependencies are inferred from the claim text.