| 摘要 |
Dyestuffs of the formula <IMAGE> wherein R1 represents hydrogen, alkyl or aralkyl, R2 represents R1 or aryl, A represents C2-C6-alkylene, X represents R2 or acyl, n represents 1-7, m represents 1 or 2 and the rings B and D can contain customary radicals, with the proviso that n is at least 2 if X represents acyl, give, when mixed with emulsifiers, dyestuff preparations which are in the liquid or dissolved form under dyeing conditions. The use of additional dispersing agents, protective colloids, levelling agents and carriers when dyeing polyester fibres thereby becomes superfluous.
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