| 摘要 |
PURPOSE:To obtain the excellent title carrier capable of maintaining a stable triboelectrostatic charge and has the rapid rising of the electrification at the same time by constituting said carrier of a carrier core particle, a thermosetting resin layer which contains a ferromagnetic particle for coating the surface of the carrier core particles and an electrostatic charge control agent fixed to the thermosetting resin layer. CONSTITUTION:The uncured coated layer of a thermosetting resin contg. the fine ferromagnetic particles is formed on the ferromagnetic carrier core material. The method of forming such layer includes those of sufficiently mixing and dispersing the fine ferromagnetic particle in a self-crosslinking type resin, and then, mixing the obtd. dispersion with the ferromagnetic core particle to form the coated layer of the carrier core particle. Next, the obtd. carrier having the uncured coated layer and the particles of the electrostatic charge control agent are mixed mechanically by a blender mill, etc., thereby sticking the agent to the coated layer. And then, the coated layer fixed with the charge control agent on the surface of a coated carrier is formed by melt-curing the coated layer with heating, and the carrier is obtd. by screening the obtd. particle to remove aggregates. Thus, the rapid rising of the electrification and the stable triboelectrifiability of the toner are obtd. |
