| abstract |
The present invention provides a method for refining an organic pigment that can be industrialized in a simple process in terms of cost and has fastness, and surface-treated organic pigment particles thereof. A metal-containing gel layer formed by a sol-gel reaction of (A) an organic pigment particle substrate and (B) a metal alkoxide containing a fluorine-containing metal alkoxide covering the surface of the organic pigment particle substrate. The surface-treated organic pigment particles have fine primary particles and excellent fastness (for example, light resistance, heat resistance, oil resistance, chemical resistance, solvent resistance, bleed resistance, migration resistance), and It is a high-performance nanopigment that exhibits stable and good dispersibility by avoiding strong aggregation (aggregation) of pigment particles. [Selection figure] None |