| 摘要 |
PROBLEM TO BE SOLVED: To solve the following problems; when a base resin of a semiconductor elastic material layer of an electrostatic charging roller has reactivity like that of a thermosetting resin, there is a restriction in the choice of dispersants and therefore it is sometimes difficult to obtain the electrostatic charging roller of a uniform resistance value and also, the influence of the dispersibility of the dispersant is so significant that the control of the resistance value is difficult. SOLUTION: The electrostatic charging roller comprises two layers constituted by coating the outer periphery of a conductive shaft body with an elastic layer and further coating the surface layer, wherein the roller is so constituted as to make the resistances of the elastic layer higer than that of the surface layer and so that the surface roughness of Rz≥6.4μm is imparted to the surface layer. COPYRIGHT: (C)2005,JPO&NCIPI
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