Charging member, the electrophotographic process cartridge and an electrophotographic apparatus

Speed ​​of recent electrophotographic apparatus, with the severer conditions of use, in order to maintain the image quality of an electrophotographic apparatus, in the charging member of an electrophotographic apparatus, to achieve both the application durability of highly conductive DC voltage the interest. Electrically and conductive support, a charging member having a conductive elastic layer, the elastic layer comprises a polymer having an alkylene oxide chain in the molecule, and an ionic conductive agent, a polyrotaxane, wherein the polyrotaxane , the interior of the ring of the cyclic molecules having an ionic group linear molecule penetrates, said linear molecule has two blocking groups, the blocking group is located at both ends of said linear molecule has a structure in which cyclic molecules can not be separated from the straight chain molecules.