| 摘要 |
PURPOSE:To retain superior image density and gradation for a long time, by coating an oxidized iron powder core with a thin film resin of specified resistivity in order to raise resistivity of the resin coated carrier. CONSTITUTION:This resin coated carrier is prepared by coating an oxidized iron powder as a core material with a thin film resin. A resin/powder ratio is kept <=10, and resistivity of the resin coated carrier thus obtained is kept within 1X10<7>- 10<11>OMEGA.cm. This carrier has low resistivity change, it can retain superior image density and gradation for a long time, and its cost is comparatively low. |
