Patent ID: 7452653
Filing Date: 2008-11-18
Classification: G03G

Abstract:
1. A process for producing a polymerized toner comprising producing colored polymer particles, which includes a binder resin which is obtained by polymerizing a polymerizable monomer in an aqueous medium and comprises at least a colorant dispersed therein, by polymerization step optionally followed by agglomeration step, wherein the process comprises the following steps (I) to (IV): (I) forming an aqueous dispersion comprising the colored polymer particles by the polymerization step optionally followed by agglomeration step; (II) subjecting the aqueous dispersion comprising the colored polymer particles obtained in step (I) to stripping treatment in the presence of a nonionic surfactant having a cloud point to remove a volatile organic compound which is included in the colored polymer particles; (III) dehydrating and washing the aqueous dispersion comprising the colored polymer particles after the stripping treatment, wherein washing is carried out by using a washing water, wherein the temperature of the washing water is controlled to lower than the cloud point of the nonionic surfactant; and (IV) filtering the aqueous dispersion comprising the colored polymer particles after washing to obtain a wet colored polymer particles, drying the wet colored polymer particles and then getting the colored polymer particles.