| 摘要 |
PURPOSE:To stabilize an electrostatic charge quantity and image density by incorporating a positive chargeable magnetic toner having a specific triboelectric charge quantity and volume average grain size, fine particles of a negative chargeable resin having a specific triboelectric charge quantity and primary average grain size and fine particles of positive chargeable silica having a specific triboelectric charge quantity and primary average grain size into a titled developer. CONSTITUTION:100pts.wt. positive chargeable magnetic toner having +9-+20muc/g triboelectric charge quantity and 5-30mum volume average grain size, 0.01-5pts.wt. fine particles of the negative chargeable resin having -10--40muc/g triboelectric charge quantity and 0.01-4mum primary average grain size, and 0.05-10pts.wt. fine particles of the positive chargeable silica having +100-+300muc/g triboelectric charge quantity and 5-30mum primary average grain size are incorporated into the developer. Since the fine particles of the negative chargeable resin impart the particles of the positive chargeable silica to the particle surfaces of the positive chargeable toner, the stable positive charge can be generated. The electrostatic charge quantity and the image density are thereby stabilized.
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