Patent ID: 7001699
Filing Date: 2006-02-21
Classification: G03G

Abstract:
1. An electrophotographic photosensitive member comprising a support, and provided thereon a photosensitive layer, wherein; a surface layer of the 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 Ar 111 and Ar 121 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 Ar 112 and Ar 122 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.