MANUFACTURING METHOD OF SELF-DISPERSIBLE PIGMENT, SELF-DISPERSIBLE PIGMENT AND INK

PROBLEM TO BE SOLVED: To provide a manufacturing method of a self-dispersible pigment capable of manufacturing a self-dispersible pigment through binding a functional group including an amino group to a particle surface of a pigment with high reaction efficiency.SOLUTION: A method for manufacturing a self-dispersible pigment includes a step of causing at least one kind of treatment agent of a compound expressed by general formula (1) and a compound expressed by general formula (2) to react with a particle surface of a pigment so as to bind a functional group including an amino group to the particle surface of the pigment. (In the formulas, Rindependently represents -S(=O)-R. Rrepresents a group having at least one of an aromatic group and an aliphatic group having 1-3 carbon atoms. Rand Rindependently represent a hydrogen atom or -S(=O)-R, and one of them is a hydrogen atom. Aindependently represents an aromatic group and an aliphatic group having one or more amino groups.)SELECTED DRAWING: None 【課題】アミノ基を含む官能基を顔料の粒子表面に高い反応効率で結合させて自己分散顔料を製造することが可能な自己分散顔料の製造方法を提供する。【解決手段】自己分散顔料を製造する方法である。一般式（１）で表される化合物及び一般式（２）で表される化合物の少なくとも１種の処理剤を顔料の粒子表面に反応させて、アミノ基を含む官能基を顔料の粒子表面に結合させる工程を有する。（Ｒ1は、それぞれ独立に−Ｓ（＝Ｏ）2−Ｒ4を表し、Ｒ4は、炭素原子数１〜３の脂肪族基及び芳香族基の少なくとも一方を有する基を表す。Ｒ2及びＲ3は、それぞれ独立に水素原子又は−Ｓ（＝Ｏ）2−Ｒ4を表し、いずれか一方が水素原子である。Ａ1は、それぞれ独立に１以上のアミノ基を有する脂肪族基又は芳香族基を表す）【選択図】なし