| 摘要 |
<p>PURPOSE: To provide a binary system developer that contains no electrostatic charge control agent utterly, which is sufficient enough in electrifiability, no toner scattering, excellent in transfer efficiency, making the required density copied image stably securable for hours, and improve the fixability of a transfer image and the smoothness of the surface of a copied image to be obtained, not to mention a gloss. CONSTITUTION: This is a binary system developer comprising a toner and a carrier. This toner includes toner grains which contain fixing resin, magnetic powder and metallic salt stearate, and this fixing resin consists of a composition containing some resin with an anionic polar group. The magnetic powder and the metallic salt stearate are contained in the toner grains at the specified rate. Carrier grains have a core grain consisting of the specified magnetic material and a covered layer covering this core grain, and this layer contains a kind of resin with a cationic polar group.</p> |
