| 摘要 |
PURPOSE:To provide such a toner without addition of external additive for a toner for electrophotographic copy machine which requires various kinds of color toners so that electrostatic charge property, fulidity, stability for time, environmental stability, etc., can be designed to make uniform for each coloring material including black, and further that the color developing property, coloring property, and OHP adaptability of color toners can be improved, and that kinds and compositions of the inner additive electrostatic charge controlling agent, external additives, etc., can be designed almost in the same way for toners of different colors. CONSTITUTION:The electrophotographic developing agent is prepared by dispersing a pigment 1 in a first binder resin 21 to make the coloring material and kneading the coloring material with second binder resin 22 so that the coloring material fine particles are dispersed in the second binder resin. It features in that the melting viscosity of the first binder resin 21 at kneading temp. is larger than the melting viscosity of the second binder resin 22. |
