| 摘要 |
There are described azo dyes of the formula where in case a) m is 1, n is 0, Y is hydroxyl, and L is C1-C6-alkylene, or in case b) m is 0 or 1, n is 1, X is hydrogen, Y is imino, and L is 1,4-piperazinediyl when m is 0 or C2-C6-alkylene or phenylene when m is 1, the use thereof for dyeing or printing paper stock, and dye mixtures comprising the novel dyes.
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