Derivatives of Naphthol AS containing carboxyl group (-COOH) as second coupling agent were used in mixed coupling process to medify C.I. pigment Red 57: 1.

• 介绍了以含羧酸基团的色酸衍生物为第二偶合组分，采用分步偶合工艺，对C．I．颜料红57：1进行了改性。