| 摘要 |
Azo dyestuffs devoid of carboxylic acid and sulphonic acid groups and of the formula (I) <IMAGE> (I) wherein R is a hydrogen atom, halogen atom, cyano, nitro, hydroxy or amino group or an organic radical, R1 is a hydrogen atom, an optionally substituted hydrocarbon or heterocyclic radical or an amino group which may be substituted, Y is a group -OCOR2, -OSO2R2 or -NHSO2R2 wherein R2 is optionally substituted alkyl or aryl, K(+) is a cationic group, X(-) is an anion and the ring A may carry further substituents or have a benz ring fused thereon. Manufacture of such dyestuffs and use in the dyeing of synthetic polymeric materials.
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