| 摘要 |
Polyazo dyes obtainable by (a) diazotizing 1-amino-8-hydroxynaphthalene-3,6-disulfonic acid and coupling onto a compound of the formula <IMAGE> (1) (b) coupling a diazotized compound of the formula <IMAGE> (2) onto the monoazo dye thus obtained, (c) coupling a diazotized compound of the formula <IMAGE> (3) onto the product obtained as per (b), and (d) if desired metallizing the product obtained as per (c), the symbols in the formulae being as defined in claim 1, are suitable for dyeing a wide range of textile and nontextile materials, in particular leather.
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