Patent ID: 10642173

Abstract:
An electrophotographic photoreceptor includes a conductive substrate, an undercoat layer on the conductive substrate, and a photosensitive layer on the undercoat layer. The undercoat layer contains at least one perinone compound selected from the group consisting of a compound represented by general formula (1) below and a compound represented by general formula (2) below, an amine compound (A) having an ionization potential of 5.4 eV or more and 5.9 eV or less, and a binder resin, where: in general formula (1), R11, R12, R13, R14, R15, R16, R17, and R18 each independently represent a hydrogen atom, an alkyl group, an alkoxy group, an aralkyl group, an aryl group, an aryloxy group, an alkoxycarbonyl group, an aryloxycarbonyl group, an alkoxycarbonylalkyl group, an aryloxycarbonylalkyl group, or a halogen atom; R11 and R12 may be bonded to each other to form a ring, so may R12 and R13, and so may R13 and R14; and R15 and R16 may be bonded to each other to form a ring, so may R16 and R17, and so may R17 and R18, and in general formula (2), R21, R22, R23, R24, R25, R26, R27, and R28 each independently represent a hydrogen atom, an alkyl group, an alkoxy group, an aralkyl group, an aryl group, an aryloxy group, an alkoxycarbonyl group, an aryloxycarbonyl group, an alkoxycarbonylalkyl group, an aryloxycarbonylalkyl group, or a halogen atom; R21 and R22 may be bonded to each other to form a ring, so may R22 and R23, and so may R23 and R24; and R25 and R26 may be bonded to each other to form a ring, so may R26 and R27, and so may R27 and R28.