Patent ID: 8012661
Filing Date: 2011-09-06
Classification: G03G

Abstract:
1. A method for producing a developing agent comprising: melt-kneading a mixture containing a polyester resin, a colorant and a releasing agent to form a kneaded product, coarsely pulverizing the kneaded product to form a coarsely granulated mixture; mixing the coarsely granulated mixture with an aqueous medium to form a mixed liquid, mechanically shearing the mixed liquid to granulate finely the coarsely granulated mixture, thereby forming a first fine particle dispersion liquid; aggregating first fine particles in the first fine particle dispersion liquid to form aggregated particles; mixing coarse particles containing at least a polyester resin with an aqueous medium to form a mixed liquid, mechanically shearing the mixed liquid to granulate finely the coarse particles, thereby forming a second fine particle dispersion liquid; and mixing the second fine particle dispersion liquid with the aggregated particles to aggregate second fine particles in the second fine particle dispersion liquid onto a surface of the aggregated particles, thereby forming capsulated toner particles containing the aggregated particles as a core and the second fine particles as a shell.