| abstract |
Dyes of the formula in which A 1 and A 2 independently of one another are the remainder of a monoazo, polyazo, metal complex azo, anthraquinone, phthalocyanine, formazane, azomethine, dioxazine, phenazine, stilbene, triphenylmethane, xanthene, thioxanthone, Are nitroaryl, naphthoquinone, pyrenequinone or perylene tetracarbimide dye, R 1 , R 2 , R 3 and R 4 are independently hydrogen or optionally substituted C 1 -C 4 alkyl, Y 1 and Y 2 independently of one another are halogen, carboxypyridinium, optionally substituted amino or a heterocyclic radical bonded via a nitrogen atom, and n is a number from 1 to 7, are particularly suitable for dyeing or printing hydroxyl-containing or nitrogen-containing fiber materials. Colorings with good fastness properties and a high dyeing yield are obtained. |