Electrophotographic photoreceptor and image forming apparatus including the same

An electrophotographic photoreceptor comprising:

• an electroconductive substrate formed of an electroconductive material;
• and
• a photosensitive layer disposed on the electroconductive substrate and containing a polyarylate resin having a structural unit represented by the following general formula (1) and an enamine compound represented by the following general formula (2):
• in which X1 represents a single bond or —CR5R6—;
• R5 and R6 each represents a hydrogen atom, a halogen atom, an alkyl group which may have a substituent, or an aryl group which may have a substituent;
• further, R5 and R6 may join to each other to form a ring structure;
• R1, R2, R3, and R4 each represents a hydrogen atom, a halogen atom, an alkyl group which may have a substituent or an aryl group which may have a substituent;
• and wherein R7˜R10 means R7, R8, R9, and R10 and wherein R7, R8, R9, and R10 each is directly attached to a different carbon atom on the indicated benzene ring not occupied by an ester group, and each represents a hydrogen atom, a halogen atom, or an alkyl group which may have a substituent or an aryl group which may have a substituent
• in which Ar1 and Ar2 each represents an aryl group selected from phenyl, naphthyl, pyrenyl, and anthryl groups which may have a substituent or a heterocyclic group selected from furyl, thienyl, thiazolyl, benzofuryl, benzothiophenyl, benzothiazolyl, and benxoxazolyl groups which may have a substituent;
• Ar3 represents an aryl group which may have a substituent, a heterocyclic group which may have a substituent, an aralkyl group which may have a substituent, or an alkyl group which may have a substituent;
• Ar 4 and Ar5 each represents a hydrogen atom, an aryl group which may have a substituent, a heterocyclic group which may have a substituent, an aralkyl group which may have a substituent, or an alkyl group which may have a substituent;
• however, both Ar4 and Ar5 do not form the hydrogen atoms;
• Ar4 and Ar5 may join to each other by way of an atom or an atomic group to form a ring structure;
• “a” represents an alkyl group which may have a substituent, an alkoxy group which may have a substituent, a dialkylamino group which may have a substituent, an aryl group which may have a substituent, a halogen atom or a hydrogen atom, and m represents an integer of 1 to 6;
• in a case where m is 2 or more, plural a may be identical or different with each other or may join to each other to form a ring structure;
• R11 represents a hydrogen atom, a halogen atom, or an alkyl group which may have a substituent;
• R12, R13, and R14 each represents a hydrogen atom, an alkyl group which may have a substituent, an aryl group which may have a substituent, a heterocyclic group which may have a substituent, or an aralkyl group which may have a substituent;
• n represents an integer of 1 to 3 and in a case where n is 2 or 3, plural R12 may be identical or different with each other, and plural R13 may be identical or different with each other;
• the substituent which may be present on Ar1, Ar2, Ar4, Ar5, a, R12, R13, and R14 is selected from an alkyl group, an alkenyl group, an alkoxy group, an amino group, a halogen group, an aryl group, an aryloxy group, and an arylthio group;
• the substituent which may be present on Ar3 is selected from an alkyl group, an alkoxy group, an amino group, a halogen group, an aryl group, an aryloxy group, and an arylthio group.