| 摘要 |
PURPOSE:To provide such a developer in which magnetic particles isolated from the carrier to the surface are hardly deposit on a photosensitive material. CONSTITUTION:The dry developer consists of a toner and a carrier containing a binder resin and magnetic powder. This carrier consists of particles treated by heating at the temp. lower than the treatment temp. for spherical particles, and the amt. of exposed magnetic powder on the surface of the carrier particles is preferably 1.0-2.0 atomic % calculated as iron element. This developer is prepared by heat treating the carrier containing a binder resin and magnetic powder at the temp. lower than the spherical treatment temp., and then mixing with the toner. |
