| 摘要 |
PURPOSE:To prevent occurrence of most of toner cloud and all of fog by attaching hydrophilic alumina to the surface of the toner in an electrophotographic developer composed of a positively chargeable toner and a negatively chargeable carrier obtained by dispersing a magnetic powder in it. CONSTITUTION:The electrophotographic binary developer to be used is composed of the positively chargeable toner having the hydrophilic alumina attached to its surface and the magnetic powder dispersion type negatively chargeable carrier having a volume average particle diameter of 30-80mum, thus permitting toner cloud to become unliable to occur at the time of development, and fog and void due to poor development not to occur even after making a large number of copies, and accordingly, images superior in image quality to be obtained. |
