Azo dyes contg. a thiazole gp. - which give fast blue or black prints and dyeings on cotton-polyester blends

摘要

Azo dyes of formula (I) are claimed. In (I) D is a radical of a diazo component; R is H, OH or (un)substd. alkyl, alkenyl, cycloalkyl, aralkyl, phenyl or heterocyclic ring; R1 and R2 are each H or (un)substd. alkyl alkenyl, alkynyl, cycloalkyl, aralkyl or aryl, or R1 and R2 together complete a satd. heterocyclic 5- to 7-membered ring; and X is H, Cl, Br, 1-4C alkyl, 1-4C alkoxy, allyloxy, beta-cyanoethoxy, benzyloxy, phenoxy, beta-alkoxycarbonylethoxy, where alkoxy is of 1-4C, 1-4C alkylmercapto, phenylmercapto or 1-4C alkanoylamino, and Y is Cl, 1-4C alkyl, allyloxy, 1-4C alkoxy, beta-cyanoethoxy, or X and Y together form a fused benzene ring, the naphthalene nucleus thus formed opt. being substd. by alkyl, Cl or Br. (I) are esp. useful for dyeing and printing cotton and cotton-polyester blended fabrics in fast blue, violet or black shades with good colour strength light fastness and wet fastness.