| 摘要 |
PROBLEM TO BE SOLVED: To provide a dry toner in which the rise of the toner charge amount is rapid, the degradation of image quality and reduction in image density are not caused even after a long-term use, and which is excellent in environmental stability. SOLUTION: In a toner including at least a binder resin and magnetic iron oxide, the magnetic iron oxide contains 0.1 to 2.0% by mass of Si with respect to the magnetic iron oxide and 0.1 to 4.0% by mass of Zn with respect to the magnetic iron oxide, the concentration of Si atoms is 12.50 to 17.50%, the concentration of Fe atoms is 70.00 to 85.00%, and the concentration of Zn atoms is 1.00 to 7.00% on the outermost surface of the magnetic iron oxide, measured by an X-ray photoelectron spectroscopy (XPS), and the Zn/Si ratio being 0.05 to 0.5, the Fe/Si ratio being 3.00 to 7.00, and the Fe/Zn ratio being 10.00 to 70.00 on the outermost surface of the magnetic iron oxide. COPYRIGHT: (C)2004,JPO |
