| 摘要 |
PROBLEM TO BE SOLVED: To obtain a method of producing a developing agent having a narrow particle size distribution and providing good image quality. SOLUTION: A dispersion liquid prepared by mixing a granular mixture containing a binder resin and a colorant with an aqueous medium is subjected to mechanical shearing to finely divide the granular mixture, thereby forming fine particles, and the fine particles are agglomerated to form agglomerated particles. The fine particles are agglomerated while stirring the dispersion liquid containing the fine particles in a stirring section including a main stirrer with a low circumferential speed of a stirring member and a sub-stirrer with a high circumferential speed of a stirring member so that stirring of the dispersion liquid in the main stirrer is assisted by the sub-stirrer, thereby the fine particles are agglomerated while applying sufficient shear to the dispersion liquid. COPYRIGHT: (C)2010,JPO&INPIT
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