| 摘要 |
<p>PURPOSE:To provide a toner capable of forming a sleeve layer in uniform thickness at all times and consequently capable of forming a stabilized picture without lowering the picture density and fluidity even after repeated printing in one-component development using a negatively charging toner. CONSTITUTION:The one-component toner particle consists essentially of a binder resin, a magnetic powder and a negative charge control agent, and the negatively charging magnetic one-component toner contains the dry-process colloidal silica and wet-process colloidal silica having 1-20mum volume average particle diameter. Since the dry-process colloidal silica and wet-process colloidal silica are jointly used in the negatively charging magnetic toner in one-component development, the defect caused when only the dry-process colloidal silica is used is eliminated, the fluidity is improved, the charge quantity is stabilized, and a high-quality picture is stably obtained.</p> |
