| abstract |
PROBLEM TO BE SOLVED: To provide a new method for producing fine particles of an organic pigment which solves the problems of a conventional build-up method. By this method, organic pigment fine particles having a uniform particle diameter or a dispersion containing the same are provided. SOLUTION: An organic pigment solution dissolved in an alkaline or acidic aqueous medium is circulated as a laminar flow in a channel, and a hydrogen ion index (pH) of the solution is changed in the laminar flow process. A method for producing fine organic pigment particles. [Selection] Figure 1-1 |