| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a pigment dispersoid providing excellent dispersion stability in an aqueous medium, and hardly causing coagulation of pigment particles. <P>SOLUTION: The pigment dispersoid is obtained by adding a basic compound to a copper phthalocyanine pigment to the surface of which a sulfonic acid group is introduced by a chemical treatment to form a salt. The ratio (HB/HA) of a turbidity value HB before the addition of the basic compound to a turbidity value HA after the addition of the basic compound is regulated so as to be ≥2.2. <P>COPYRIGHT: (C)2004,JPO |
