| 摘要 |
PURPOSE:To obtain a photosensitive body for electrophotography with which a copy having no deterioration in image quality such as a photographic fog is made with a photosensitive body for electrophotography which has a protective layer dispersed with pulverous metallic oxide powder in a binder resin as a surface layer by specifying the grain size distribution of the pulverous metallic oxide powder in the protective layer. CONSTITUTION:The ratio of the pulverous metallic oxide powder in a protective layer is 20- 70wt% in the layer upper within 1mum than the surface and 10-60 wt% in the layer lower than the same and the ratio of the pulverous metallic oxide powder in the upper layer is made larger than in the lower layer. The concn. in the upper layer is thus made larger than the concn. in the lower layer and therefore the protective layer has excellent wear resistance on the surface. On the other hand, the ratio at which a binder resin occupies in the photosensitive layer, that is, the photoconductive layer or the lower layer adjacent to the other layer such as the intermediate layer or the like is relatively large and therefore the photosensitive layer has good adhesion. The thickness of the upper layer where the concn. of the pulverous metallic oxide powder is large is relatively small as compared to the overall thickness of the protective layer and consequently the protective layer is excellent in terms of transparency as well and has high resolving power. The decrease in photosensitivity is controlled as compared with the photosensitive layer having no protective layer. A satisfactory result is obtainable with the residual potential and the photographic fog by decreasing the difference between the concn. in the upper layer and the concn. in the lower layer. |
