Patent ID: 6638674
Filing Date: 2003-10-28
Classification: G03G

Abstract:
A magnetic toner, comprising: magnetic toner particles each comprising at least a binder resin, an iron oxide and a sulfur-containing polymer, and inorganic fine powder blended with the magnetic toner particles; whereinthe magnetic toner particles have a weight-average particle size (D4) of 3-10 &mgr;m, the magnetic toner particles have an average circularity of at least 0.970, the magnetic toner particles have a magnetization of 10-50 Am2/kg (emu/g) at a magnetic field of 79.6 kA/m (1000 oersted), and the magnetic toner particles retain carbon in an amount of A and sulfur in an amount of E at surfaces thereof as measured by X-ray photoelectron spectroscopy, giving a ratio E/A from 0.0003-0.0050.