| 摘要 |
1. A method of producing dyeing agents for dying black products made from polyamide and/or protein fibres and leather containing chromo complex azo dyes 1:2 with the formula 1, in which M and M<1> are same or different and stand for colourless cations, and chromo complex azo dye 1:2 with the formula 2, in which X and X<1> are same or different and stand for colourless cations characterised in that the monoazo dye with the formula 3, produced by coupling diazo 1-amino-2-hydroxy-6-nitronaphthalenesulfonic-4 acid and monoazo dyes with formulas 4 and 5, produced by coupling diazo 4-nitro-2-aminophenol respectively with naphthol and acetoacetic anilide and used in mole proportion and dyes with formulas 4 and 5 as 80-99:20-1, where the mole proportion of the monoazo dye with the formula 3 and monoazo dyes with formulas 4 and 5 is 0.45-0.55:0.55-0.45, is treated with a compound which releases chromium easily, used in the amount corresponding to at least 0.45-0.55 moles of Cr for 1 mole of above mentioned monoazo dyes with formulas 3, 4 and 5, in strongly acidic medium in higher temperature, possibly under pressure, preferably in the presence of organic acids, and further the reaction is continued at a higher temperature at pH exceeding 4.0, preferably pH=5.0-9.0, and the solution or possibly the suspended matter of the mixture of chromo complex dyes 1:2 with the formulas 1 and 2 is possibly carried out directly into dyes in the marketed form of powder, granulate or liquid.<IMAGE>
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