Containing magnetic particles having a bulk resistivity of at most 104 ohm.cm and a powder resistivity of 105-1012 ohm.cm

摘要

A magnetic toner for developing characteristic latent images is disclosed. The magnetic toner has a magnetic material content W (wt. %) of 20-60 wt. %, a saturation magnetization sigma s of W emu/g or higher as measured at a magnetic field of 10 k Öe, and a bulk resistivity of 1013 OMEGA .cm or higher. Because of the combination of a high sigma s and a high resistivity, the magnetic toner has good image forming characteristics including image density, reproducibility of thin lines and transferability under various environmental conditions and for a long period of image formation.