| abstract |
The new disazo dyestuffs of the formula (I) wherein the substituents and the indices have the meanings given in the description, wherein more than 25 equivalent % of all the M cations in the molecule are alcohol ammonium radicals of the formula (+)NR1R2R3R4 wherein R1, R2, R3 and R4 independently of one another represent hydrogen, C1-C4-alkyl and C2-C4-hydroxyalkyl, with the proviso that at least one of the radicals R1-R4 denotes C2-C4-hydroxyalkyl, are excellently suitable for dyeing cellulose-containing materials, and in particular paper, and are distinguished by high degrees of fastness. |