| abstract |
For the preparation of concentrated solutions of cationic polyazo dyes of the formula <IMAGE> in which R is hydrogen or methyl and R 1 is an alkyl radical having 1 to 3 carbon atoms which is optionally substituted by hydroxy, alkoxy or halogen, and their mixed coupling products with aromatic monoamines, diaminobenzenes are general Formula <IMAGE> in which R has the meaning given above, optionally in a mixture with up to 30 mol% of aromatic monoamines of the formula <IMAGE> in which R² is hydrogen, halogen, C1-C4-alkyl, C1-C4-alkoxy and C1-C4-acylamino and n is 1 to 3, dissolved in aliphatic carboxylic acids having 2 to 4 carbon atoms, which may optionally be substituted by halogen, hydroxy or alkoxy, and at 0 to 30 ° C. at 0.5 to 0 , 75 mol of a salt or ester of nitrous acid per mol of diamine. |