| 摘要 |
PURPOSE:To improve electrostatic characteristics and to form the developer which has the wide tolerance width of toner concn. and is practicably usable by mixing a charge control agent stuck with hydrophobic silica with a resin carrier having a spherical shape and uniformly dispersing the charge control agent on the resin carrier, then fusing and fixing the control agent. CONSTITUTION:The hydrophobic silica 3 is previously sprinkled on the surface of the charge control agent 1 and this charge control agent 1 and the hydrophobic silica 2 which is previously spheroidized are mixed and agitated. The flowability of the charge control agent 1 is then improved by the hydrophobic silica 3 acting as a lubricant in the stage of the mixing and agitating and the charge control agent can be uniformly electrostatically stuck onto the resin carrier 2. The charge control agent 1 dispersed uniformly on the resin carrier 2 is then fused and fixed. The electrostatic characteristic of the resin carrier 2 is improved in this way and the margin of the toner concn. is expanded. |
