| 摘要 |
Azo dyes of formula <IMAGE> (1) <IMAGE> wherein R1 and R2 are each independently of the other hydrogen or unsubstituted or substituted C1-C4alkyl, R3, R4, R5, R6 and R7 are each independently of one another hydrogen, halogen, sulfo, carbamoyl, carboxy, unsubstituted or hydroxy-substituted C1-C4alkyl or C1-C4alkoxy; C2-C4alkanoylamino which is unsubstituted or substituted in the alkyl moiety by hydroxy or C1-C4alkoxy, or ureido which is unsubstituted or substituted in the amino end group by one or two C1-C4alkyl groups, Y1 is hydroxy, halogen, C1-C4alkoxy, C1-C4alkylthio, amino; N-mono-C1-C4alkylamino or N,N-di-C1-C4alkylamino, each of which is unsubstituted or substituted in the alkyl moiety by hydroxy, sulfo, carboxy or C1-C4alkoxy; C5-C7cycloalkylamino which is unsubstituted or substituted in the cycloalkyl ring by C1-C4alkyl; phenylamino or N-C1-C4alkyl-N-phenylamino, each of which is unsubstituted or substituted in the phenyl ring by C1-C4alkyl, C1-C4alkoxy, carboxy, sulfo or halogen; morpholino or piperidin-1-yl, and A1 is the radical of a metal-free monoazo dye, are direct dyes for different substrates, in particular cellulosic fibre materials. Said dyes are high-temperature resistant and are therefore particularly suitable for the one-bath, single-step dyeing of polyester/cotton blends with a disperse dye for polyester fibres under the dyeing conditions for polyester fibres.
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