| 摘要 |
PURPOSE:To provide magnetic particles for magnetic toner which have a high flow property and excellent electrification stability and initial dispersibility and do not absorb much oil and a method by which the magnetic particles can be manufactured in an industrial scale. CONSTITUTION:Magnetic particles for magnetic toner are constituted in such a way that each spherical particle is composed of a spherical magnetite particle containing silicon element by 0.10-1.00wt.% and coated with coprecipitated silica and alumina. In addition, fine powder of the nonmagnetic oxide or nonmagnetic hydroxide of an element selected from among Fe, Ti, Zr, Si, and Al is firmly adhered to the coprecipitated silica and alumina and the magnetic particles have a mean diameter of 0.05-0.5mum. |
