| 摘要 |
PURPOSE:To form a develop which exerts a less mechanical influence to a photosensitive body in a cleaning part without deteriorating image characteristics by incorporating a vinylidene fluoride polymer having >=0.3 absolute content ratio of a beta crystal and specifying the existence rate of particles having <=6.35mum grain size to <=25%. CONSTITUTION:This developer contains 0.1-0.3wt% vinylidene fluoride polymer having >=0.3 absolute content ratio of the beta crystal and has <=25% existence rate of the particles having <=6.35mum grain size. Lubricity and polishability are simultaneously required for the vinylidene fluoride polymer (PVDF). The absolute content ratio of the beta crystal is required to be preferably >=0.35 and the polymer is required to be incorporated preferably at 0.2-0.3wt% into the toner in order to satisfy the above-mentioned requirement. The grain size of the toner classification is required to be preferably <=15% classification. The injuries of the photosensitive body are decreased and the long-life and high- quality image without generating occultation and black spots is obtd. by combining the above-mentioned two conditions. |
