| 摘要 |
<p>The invention comprises mixtures of yellow water-insoluble disazo-dyestuffs consisting of two symmetrical and one asymmetrical dyes of the formulae <FORM:1090794/C4-C5/1> <FORM:1090794/C4-C5/2> <FORM:1090794/C4-C5/3> wherein (a) R1 and R2 are methyl groups and R3 is a hydrogen atom, or (b) R1 and R3 are methoxy groups and R2 is a chlorine atom. They are prepared by coupling tetrazotized 4,41 - diamino 3,31 - dichlorodiphenyl with 2 moles of a mixture of (a) 1-acetoacetylamino 2-methoxy benzene and 1-acetoacetylamino 2,4-dimethylbenzene; or (b) 1-acetylamino 2-methoxy benzene and 1-acetylamino 2,5-dimethoxy 4-chlorobenzene, the coupling components being used preferably in a weight ratio of 20:1 to 1:20 with reference to 1-acetylamino-2-methoxybenzen. Coupling may take place in presence of nonionic, anionic or cationic dispersing agents and an organic solvent e.g. pyridine, quinoline or dimethylformamide. The coupling mixture may be heated with simultaneous addition of an organic solvent.</p> |
