| 摘要 |
Concentrated stable solutions of cationic azo dyestuffs of the formula <IMAGE> (I) wherein A denotes the radical of an aromatic-carbocyclic or aromatic-heterocyclic diazo component, R denotes alkylene, R1 denotes hydrogen or alkyl, R2 denotes alkyl, alkenyl or aralkyl, R3 denotes alkyl, R4 denotes hydroxyalkyl with 2 or more C atoms, R5 denotes halogen, alkyl, alkoxy, aryloxy, acyl or acylamino, m denotes 0, 1, 2, 3 or 4 and An (-) denotes a carboxylate ion, and wherein the cyclic and acyclic substituents can carry further non-ionic substituents, which solutions have a low salt content, are prepared by simultaneously reacting amines of the formula A-NH2 (II) coupling components of the formula <IMAGE> (III) and alkali metal nitrites or alkaline earth metal nitrites in aqueous carboxylic acids and, if appropriate, organic water-soluble solvents, and then separating off the alkali metal sulphates or alkaline earth metal sulphates which thereby crystallize out.
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