Electrophotographic photosensitive member, process cartridge and electrophotographic apparatus

A process cartridge comprising an electrophotographic photosensitive member having a photosensitive layer on a support, and at least one means selected from the group consisting of a charging means, a developing means, a transfer means and a cleaning means which are integrally supported;

• and being detachably mountable to the main body of an electrophotographic apparatus;
• wherein;
• a surface layer of said electrophotographic photosensitive member contains:
• an electrically insulating binder resin;
• and
• a random copolymer type high molecular weight charge transporting material having a repeating structural unit represented by the following Formula (11) and a repeating structural unit represented by the following Formula (12):
• wherein Ar111 and Ar121 each independently represent a substituted or unsubstituted divalent aromatic hydrocarbon ring group other than a phenylene group, or a substituted or unsubstituted divalent aromatic heterocyclic ring group, and Ar112 and Ar122 each independently represent a substituted or unsubstituted monovalent aromatic hydrocarbon ring group or a substituted or unsubstituted monovalent aromatic heterocyclic ring group;
• provided that a case is excluded in which the repeating structural unit represented by Formula (11) and the repeating structural unit represented by Formula (12) are identical in structure;
• the random-corpolymer type high-molecular-weight charge-transporting material having a weight-average molecular weight Mw of 1,500 to 9,000;
• and the random-copolymer type high-molecular-weight charge-transporting material formed by reacting two or more kinds of monomer materials simultaneously at the time of synthesis reaction for the copolymer.

An electrophotographic apparatus comprising an electrophotographic photosensitive member having a photosensitive layer on a support, a charging means, an exposure means, a developing means and a transfer means, wherein;

• a surface layer of said electrophotographic photosensitive member contains:
• an electrically insulating binder resin;
• and
• a random copolymer type high molecular weight charge transporting material having a repeating structural unit represented by the following Formula (11) and a repeating structural unit represented by the following Formula (12):
• wherein Ar111 and Ar121 each independently represent a substituted or unsubstituted divalent aromatic hydrocarbon ring group other than a phenylene group, or a substituted or unsubstituted divalent aromatic heterocyclic ring group, and Ar112 and Ar122 each independently represent a substituted or unsubstituted monovalent aromatic hydrocarbon ring group or a substituted or unsubstituted monovalent aromatic heterocyclic ring group;
• provided that a case is excluded in which the repeating structural unit represented by Formula (11) and the repeating structural unit represented by Formula (12) are identical in structure ;
• the random-copolymer type high-molecular-weight charge-transporting material having a weight-average molecular weight Mw of 1,500 to 9,000;
• and the random-copolymer type high-molecular-weight charge-transporting material formed by reacting two or more kinds of monomer materials simultaneously at the time of synthesis reaction for the copolymer.