| abstract |
(57) [Summary] [Purpose] To provide a developing roll that exhibits excellent leak resistance, maintains stable image density even with environmental changes, and can effectively reduce adverse effects on images. To do. [Composition] On the outer peripheral surface of the conductive base layer forming the cylindrical surface, In a developing roll formed by laminating and forming at least one semiconductive coating layer, in the semiconductive coating layer, a binder resin is mixed with an electronic conductive material and an ion conductive material, and a binder resin is mixed with an electronic conductive material. Has a volume resistivity (R) of 10 10 to 10 12 Ωcm, and further has a volume resistivity (R) of 10 7 to 10 7 It was formed of a material having a resistance of 10 10 Ωcm. |