| 摘要 |
The present invention refers to trisazo dyes of the formula Ior an alkali metal salt thereof; wherein:Ar1 is an optionally substituted arylene group;Ar2 is an optionally substituted aryl group;R<1>, R<2>, R<3>, R<4>, X<1 >and X<2 >are defined as given in claim 1;each of D<1 >and D<2>, independently, is a chromophore group of the formulawherein the variables are defined as given in claim 1,a process for their preparation and a process for colouring fibre material containing a group reactive with a reactive dye.
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