Azo dyestuffs devoid of carboxylic acid and sulphonic acid groups and of the formula I ##STR1## wherein A is the residue of 1,3 or 1,4-benzodioxan ring structure fused to the thiazole ring via the benzene ring, B is the residue of a para-coupling amine or an indole, R is an optionally substituted alkyl, alkenyl, cycloalkyl or aralkyl radical and X is an anion. The dyestuffs are useful for the colorization of synthetic polymeric materials particularly polyacrylonitrile and copolymers thereof.
没有羧基和
磺酸基的偶氮
染料,
化学式为I,其中A是通过苯环与
噻唑环融合的1,3或1,4-苯并二氧杂环残基,B是对位偶
联胺或
吲哚残基,R是可选替代的烷基,烯基,环烷基或芳基基团,X是阴离子。这些
染料可用于合成聚合物材料的着色,特别是聚
丙烯腈及其共聚物。