| 摘要 |
Disazo compounds of the formula <IMAGE> in which A is a diazo component radical, B is a coupling/diazo component radical of the 1,4-phenylene, 1,4-naphthylene or 5,6,7,8-tetrahydro-1,4-naphthylene series, R3 is hydrogen (C1-4)alkyl or <IMAGE> wherein ring Z is unsubstituted or monosubstituted by halo, (C1-4)alkyl or (C1-4)alkoxy, and R4 is (C1-6)alkyl, (C1-6)alkoxy, amino mono(C1-6)alkylamino or di(C1-6) alkylamino, with the proviso that the compound contains a single sulpho group on the diazo component radical A and no other water-solubilizing group, which compound is in free acid or salt form, and mixtures of such compounds which are useful as anionic dyestuffs for dyeing and printing substrates such as natural and synthetic polyamides (e.g., wool, silk and nylon), leather, polyurethanes and polyolefins modified to contain basic groups. The dyes may be used as such or in the form of liquid (e.g., concentrated aqueous) or solid preparations.
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