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 hydrogen or an optionally substituted alkyl, aralkyl or aryl radical, R2 represents hydrogen or an optionally substituted alkyl or aralkyl radical, R3 represents hydrogen, halogen, C1-4alkyl or C1-4alkoxy and R4 represents hydrogen, halogen, hydroxy, C1-4alkyl, acylamino, sulpho or carboxy, 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 red 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 代表氢或任选取代的烷基、芳基或芳基,R2 代表氢或任选取代的烷基或芳基,R3 代表氢、卤素、C1-4烷基或 C1-4 烷氧基,R4 代表氢、卤素、羟基、C1-4烷基、酰
氨基、磺基或羧基,这些取代基使
染料分子含有一个或两个磺基。
这些
染料作为
酸性染料适用于天然和合成聚酰胺纺织品,可产生黄色至红色的色调。