Azo dyes, process for their preparation and their use for dyeing or printing natural or synthetic materials

摘要

This invention relates to dyes of formulawhereinR1 is hydrogen, halogen, C1-C8alkyl, -NH-CO-C1-C4alkyl or phenyl,R2 is hydrogen, halogen, C1-C8alkyl, C1-C8alkoxy, -NH-CO-C1-C4alkyl or phenyl,R3 is hydrogen, C1-C8alkyl or phenyl,R4 is hydrogen, halogen or C1-C8alkyl, andX is -CO-, - COO-or -SO2-, andn is the number 1 or 2,to their preparation and to their use for dyeing or printing natural and synthetic materials, in particular synthetic polyamide fibre materials.