| 摘要 |
PURPOSE:To obtain the carrier for developers having an excellent developer life and high-speed developability by incorporating fluoroplastic powder into a binder resin and specifying the existence ratio of the fluorine atoms in the entire atom of the carrier surface. CONSTITUTION:The fluoroplastic powder is incorporated into the binder resin and the existence ratio of the fluorine atoms in the entire atom of the carrier surface is adjusted to 6 to 30atomic%. The existence ratio of the fluorine atoms varies with the amt. of the fluoroplastic to be added, the degree of dispersion or flocculation, the process for production of the carrier, etc. A sufficient electrostatic charge quantity is imparted to the carrier and the resistance to surface contamination is improved by adjusting the above-mentioned ratio to 6 to 30 atomic%. The developer life at the time of the high-speed development is prolonged in this way. |
