| 摘要 |
1. A process for the preparation, in aqueous medium, of asymmetric 1 : 2 chromium complex dyes of not less than 90% purity and containing at least one water-solubilising group, which process comprises, in a single vessel process, reacting a mixture of two metallisable azo dyes that contain diazo components that differ from one another and coupling components that differ from one another, or a mixture of a metallisable azo dye and a metallisable azomethine dye, in the molar ratio of 0.85 : 1.0 to 1.2 : 1.0, where only one of the two mixture components contains at least one water-solubilising group, with a chromium donor, under pressure and at a temperature above 100 degrees C and at a pH between 0 and 2, and subsequently continuing the reaction at a weakly acid, neutral or weakly alkaline pH. |
