| 摘要 |
<p>PURPOSE:To obtain a magnetic toner not causing tailing while maintaining image quality by incorporating a bonding resin and magnetic powder having specified saturation magnetization and coercive force. CONSTITUTION:This magnetic toner used in an image forming method by an electrophotographic system contains at least a bonding resin and magnetic powder having >=50emu/g saturation magnetization and <=500e coercive force measured in a magnetic field of 10kOe. The magnetic powder is soft ferrite powder having a compsn. represented by a formula (MO)100-x (Fe2O3)x [where (x) is 45-70mol% and MO is Zn oxide and oxide of at least one kind of element selected from among Li, Mn, Ni, Mg, Cu, etc.]. The coercive force of the magnetic powder is regulated in accordance with the structure such as magnetoplumbite or spinel structure, with an additive or by orientation in a magnetic field.</p> |
