Electrophotographic photoreceptor, process cartridge, and image forming apparatus

An electrophotographic photoreceptor comprising:

• a conductive base body;
• and
• a multilayered photosensitive layer disposed on the conductive base body and including a charge generation layer and a charge transport layer,
• wherein the charge transport layer is an uppermost surface layer and contains a charge transport material, a polyester resin, and a compound (T) represented by Formula (T) below,
• the polyester resin includes a polyester resin (1) including at least one selected from the group consisting of a diol unit (P1) represented by Formula (P1), a diol unit (P2) represented by Formula (P2), a diol unit (P3) represented by Formula (P3), a diol unit (P5) represented by Formula (P5), and a diol unit (P6) represented by Formula (P6),
• the polyester resin (1) further includes a unit including a biphenyl skeleton, and
• end groups of the polyester resin (1) do not include fluorine atoms,
• ArT1-LT1-ArT2 Formula (T)
• in Formula (T), ArT1 is an optionally substituted naphthyl group or an optionally substituted biphenyl group, LT1 is a single bond or an ether bond, and ArT2 is an optionally substituted aryl group having 6 or more and 12 or less carbon atoms or an optionally substituted aralkyl group having 7 or more and 20 or less carbon atoms,
• in Formula (P1), Rb101 is a branched alkyl group having 4 or more and 20 or less carbon atoms, Rb201 is a hydrogen atom or an alkyl group having 1 or more and 3 or less carbon atoms, and Rb401, Rb501, Rb801, and Rb901 are each independently a hydrogen atom, an alkyl group having 1 or more and 4 or less carbon atoms, an alkoxy group having 1 or more and 6 or less carbon atoms, or a halogen atom,
• in Formula (P2), Rb102 is a linear alkyl group having 4 or more and 20 or less carbon atoms, Rb202 is a hydrogen atom or an alkyl group having 1 or more and 3 or less carbon atoms, and Rb402, Rb502, Rb802, and Rb902 are each independently a hydrogen atom, an alkyl group having 1 or more and 4 or less carbon atoms, an alkoxy group having 1 or more and 6 or less carbon atoms, or a halogen atom,
• in Formula (P3), Rb113 and Rb213 are each independently a hydrogen atom, a linear alkyl group having 1 or more and 3 or less carbon atoms, an alkoxy group having 1 or more and 4 or less carbon atoms, or a halogen atom, d is an integer of 7 or more and 15 or less, and Rb403, Rb503, Rb803, and Rb903 are each independently a hydrogen atom, an alkyl group having 1 or more and 4 or less carbon atoms, an alkoxy group having 1 or more and 6 or less carbon atoms, or a halogen atom,
• in Formula (P5), Ar105 is an aryl group having 6 or more and 12 or less carbon atoms or an aralkyl group having 7 or more and 20 or less carbon atoms, Rb205 is a hydrogen atom or an alkyl group having 1 or more and 3 or less carbon atoms, and Rb405, Rb505, Rb805, and Rb905 are each independently a hydrogen atom, an alkyl group having 1 or more and 4 or less carbon atoms, an alkoxy group having 1 or more and 6 or less carbon atoms, or a halogen atom, and
• in Formula (P6), Rb116 and Rb216 are each independently a hydrogen atom, a linear alkyl group having 1 or more and 3 or less carbon atoms, an alkoxy group having 1 or more and 4 or less carbon atoms, or a halogen atom, e is an integer of 4 or more and 6 or less, and Rb406, Rb506, Rb806, and Rb906 are each independently a hydrogen atom, an alkyl group having 1 or more and 4 or less carbon atoms, an alkoxy group having 1 or more and 6 or less carbon atoms, or a halogen atom.