Water-soluble monoazo dyes having the formula:
in which rings A and B may carry other substituents, X represents hydrogen, carboxy or sulpho, R1 represents C1-4alkyl or aryl, R2 represents hydrogen or optionally substituted C1-4alkyl, R3 represents hydrogen, halogen, C1-4alkyl, CI-4alkoxy, cyano or carboxy and R4 represents hydrogen, halogen, C1-4alkyl or sulpho, the substituents being such that the dye molecule contains either one or two sulpho groups.
The dyes are applicable as acid dyes to natural and synthetic polyamide textiles on which they. give yellow to orange shades.
具有以下式子的
水溶性单偶氮
染料
其中,环 A 和环 B 可带有其它取代基,X 代表氢、羧基或磺基,R1 代表 C1-4 烷基或芳基,R2 代表氢或任选取代的 C1-4 烷基,R3 代表氢、卤素、C1-4烷基、CI-4烷氧基、
氰基或羧基,R4 代表氢、卤素、C1-4烷基或磺基,这些取代基使
染料分子含有一个或两个磺基。
这些
染料可作为
酸性染料用于天然和合成聚酰胺纺织品,在纺织品上可产生黄色至橙色的色调。