| 摘要 |
Water-soluble dyes of formula (I) in which R1 is hydrogen, hydroxyl, C1-4 alkyl, C1-4 alkoxy, halogen or SO3M, R2 is hydrogen, C1-4 alkyl or C3-6- cycloalkyl, B is the radical of a carbocyclic, heterocyclic or methylene- active non-cyclic coupling component having at least two optionally fused carbocyclic rings, and M is hydrogen or a non-chromophoric cation, the ring A has no further substituents or is substituted with from one to four of the following substituents: C1-4-alkyl, C1-4-alkoxy, halogen, -NO2, -COOM and - SO3M, and the group -N=N-B is bonded to position 3 or 4 of the ring A, with the proviso that the molecule contains at least two -SO3M groups, are suitab le for dyeing or colouring non-fibrous substrates, in particular anodized aluminium or water-soluble plastic compositions.
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