Patent ID: 6408152
Filing Date: 2002-06-18
Classification: G03G

Abstract:
A process cartridge comprising:an electrophotographic photosensitive member comprising an electroconductive support and a photosensitive layer provided on the support; and a charging means having a charging member which is provided in contact with the electrophotographic photosensitive member and charges the electrophotographic photosensitive member electrostatically by applying a voltage formed by superimposing an alternating-current voltage on a direct-current voltage; said electrophotographic photosensitive member and said charging means being supported as one unit and being detachably mountable to the main body of an electrophotographic apparatus; and said electrophotographic photosensitive member having a surface layer which contains i) a polyarylate resin having a weight-average molecular weight from 7.5Ã—103 to 3.7Ã—104 and having a structural unit represented by the following Formula (1) and either a polycarbonate resin having a weight-average molecular weight more than 3.7Ã—104 and having a structural unit represented by the following Formula (2) or a polyarylate resin having a weight-average molecular weight more than 3.7Ã—104, ii) a fluorine-containing comb graft polymer and iii) fluorine-containing resin particles â€ƒwherein X1 represents â€”CR13R14â€” (where R13 and R14 are the same or different and each represent a hydrogen atom, a trifluoromethyl group, a substituted or unsubstituted alkyl group or a substituted or unsubstituted aryl group), a substituted or unsubstituted cycloalkylidene group, a substituted or unsubstituted &agr;,&ohgr;-alkylene group, a single bond, â€”Oâ€”, â€”Sâ€”, â€”SOâ€” or â€”SO2â€”; and R1 to R12 are the same or different and each represent a hydrogen atom, a halogen atom, a substituted or unsubstituted alkyl group or a substituted or unsubstituted aryl group; wherein X2 represents â€”CR23R24â€” (where R23 and R24 are the same or different and each represent a hydrogen atom, a trifluoromethyl group, a substituted or unsubstituted alkyl group or a substituted or unsubstituted aryl group), a substituted or unsubstituted cycloalkylidene group, a substituted or unsubstituted &agr;,&ohgr;-alkylene group, a single bond, â€”Oâ€”, â€”Sâ€”, â€”SOâ€” or â€”SO2â€”; and R15 to R22 are the same or different and each represent a hydrogen atom, a halogen atom, a substituted or unsubstituted alkyl group or a substituted or unsubstituted aryl group.