Patent ID: 7541128
Filing Date: 2009-06-02
Classification: G03G

Abstract:
1. A toner composition, comprising: toner particles comprising: wherein the binder resin has a glass transition temperature not lower than 35° C. and lower than 55° C., and wherein the particulate material has an average particle diameter of from 0.002 to 0.2 times that of the toner particles; wherein the particulate material comprises a particulate resin having a glass transition temperature of from 55 to 100° C.; wherein the particulate resin is crosslinked using a crosslinking agent; wherein the binder resin comprises tetrahydrofuran-insoluble components in an amount of from 2 to 30% by weight; and wherein the toner particles are prepared by a method comprising dissolving or dispersing a toner composition, comprising dispersing the oil phase liquid in an aqueous medium comprising said particulate material while subjecting the polyester prepolymer (A) to an addition polymerization reaction using said compound having said active hydrogen as a cross-linking agent, extending agent or both, to prepare said urea-modified polyester resin and to prepare a dispersion; removing at least the organic solvent from the dispersion to prepare the toner particles comprising the binder resin; washing the toner particles; and drying the toner particles.