Difficultly-water-soluble diazo dyes

摘要

New diazo dyes of formula (where A and D are residues of benzene series and B opt. subst. amino, alkoxy or opt. ring-subst. group) are obtained by coupling diazonium cpd. of aminoazo dye of formula H2N-A-N=N-D with 1-hydroxynaphthalene cpd. coupling in 2-position, the dye having no water-solubilizing groups acid-dissociating in water.