| 摘要 |
PURPOSE:To obtain an always stable image by adding fine silica powder of 0.1-5mu average size having an amino group on the surface to a negative chargeable toner. CONSTITUTION:The fine silica powder of 0.1-5mu average size having the amino group on the surface is added to the negative chargeable toner. Namely, the fine silica powder of 0.1-5mu grain size which has the amino group on the surface and is treated by amino silane and/or amino-modified silicone oil is added and mixed to and with the negative chargeable toner powder prepd. by dispersing and incorporating a magnetic material, charge control agent, coloring agent, offset preventive agent, other additives, etc., at need into a binder resin. Since the negative chargeability of the toner is relieved, the charge-up phenomenon is suppressed. The stable image is thus obtd. even after long-term use. |
