Patent ID: 8632931
Filing Date: 2014-01-21
Classification: G03G

Abstract:
1. An electrophotographic photosensitive member, comprising: a conductive support; an intermediate layer; and a photosensitive layer, the intermediate layer and the photosensitive layer being provided on the conductive support in the stated order, wherein: the intermediate layer contains a polyolefin resin and an organic electron- transporting substance; the polyolefin resin comprises: a repeating structural unit represented by the following formula (11); a repeating structural unit represented by one of the following formulas (21) and (22); and a repeating structural unit represented by any one of the following formulas (31), (32), (33), and (34), and the mass ratio (%) of the repeating structural unit represented by the formula (11) in the polyolefin resin is 75 mass % or more and 94 mass % or less; and the organic electron-transporting substance comprises a compound selected from the group consisting of an imide-based compound represented by the following formula (1), a benzimidazole-based compound represented by the following formula (2), a benzimidazole-based compound represented by the following formula (3), a benzimidazole-based compound represented by the following formula (4), a quinone-based compound represented by the following formula (5), a quinone-based compound represented by the following formula (6), a quinone-based compound represented by the following formula (7), a cyclopentadienylidene-based compound represented by the following formula (8), and derivatives of the compounds: where R 11 to R 14 each independently represent a hydrogen atom or an alkyl group; where R 21 to R 24 each independently represent a hydrogen atom, an alkyl group, a phenyl group, or a monovalent group represented by —Y 21 COOH where Y 21 represents a single bond, an alkylene group, or an arylene group, R 25 and R 26 each independently represent a hydrogen atom, an alkyl group, or a phenyl group, and X 21 represents a divalent group represented by —Y 22 COOCOY 23 —where Y 22 and Y 23 each independently represent a single bond, an alkylene group, or an arylene group, provided that at least one of R 21 to R 24 represents a monovalent group represented by —Y 21 COOH; where, in the formulas (31) to (34), R 31 to R 35 each independently represent a hydrogen atom or a methyl group, R 41 to R 43 each independently represent an alkyl group having 1 to 10 carbon atoms, and R 51 to R 53 each independently represent a hydrogen atom or an alkyl group having 1 to 10 carbon atoms; where, in the formula (1), R 1 and R 2 each independently represent a substituted or unsubstituted alkyl group, or a substituted or unsubstituted aryl group, and n represents 1; where, in the formula (2), R 3 to R 6 each independently represent a hydrogen atom, a substituted or unsubstituted alkyl group, or a halogen group, n represents 1; where, in the formula (3), R where, in the formula (4), R 11 and R 12 each independently represent a hydrogen atom, a substituted or unsubstituted alkyl group, a halogen group, or a nitro group, R 13 represents a substituted or unsubstituted alkyl group, or a substituted or unsubstituted aryl group, and n represents 1; where, in the formula (5), R 14 to R 21 each independently represent a hydrogen atom, or a substituted or unsubstituted alkyl group, or two arbitrary adjacent groups of R's (R 14 to R 21 ) may be bonded to each other so as to be cyclic; where, in the formula (6), R 31 represents an oxygen atom or a dicyanomethylene group, R 32 to R 39 each independently represent a hydrogen atom, a substituted or unsubstituted alkyl group, a substituted or unsubstituted aryl group, a halogen group, or a nitro group, X 2 represents a carbon atom or a nitrogen atom, and, when X 2 represents a nitrogen atom, neither R 35 nor R 36 is present; where, in the formula (7), R 40 represents an oxygen atom or a dicyanomethylene group, R 41 to R 48 each independently represent a hydrogen atom, a hydroxyl group, a carboxyl group, a halogen group, or a substituted or unsubstituted alkyl group, X 3 represents a carbon atom or a nitrogen atom, and, when X 3 represents a nitrogen atom, neither R 43 nor R 47 is present; and where, in the formula (8), R 22 represents an oxygen atom, a dicyanomethylene group, or an anilidene group, the anilidene group may have an alkyl group, R 23 to R 30 each independently represent a hydrogen atom, an ester group, or a nitro group, X 1 represents a carbon atom or a nitrogen atom, and, when X 1 represents a nitrogen atom, neither R 26 nor R 27 is present.