Electrophotographic photosensitive member, process cartridge, and electrophotographic apparatus

A process cartridge, comprising:

• an electrophotographic photosensitive member and at least one unit that is integrally supported being selected from the group consisting of a charging unit, a developing unit and a cleaning unit, said process cartridge being detachably attachable to an electrophotographic apparatus main body;
• and
• the electrophotographic photosensitive member comprising in this order a support, an undercoat layer, a charge generation layer and a charge transport layer, said undercoat layer comprising a cured product of an electron transport material, a polyolefin resin and an isocyanate compound having two or more isocyanate groups, wherein
• the electron transport material has at least one member selected from the group consisting of a hydroxyl group, a thiol group, an amino group and a carboxyl group, and
• the polyolefin resin has at least one member selected from the group consisting of a carboxyl group, an alkoxycarbonyl group and an anhydrous carboxylic acid structure and an optionally substituted phenyl group, the polyolefin resin having a structure represented by formula (B1) and a structure represented by formula (B2)
• where B101 to B104 are independently selected from the group consisting of a hydrogen atom, a methyl group and an optionally substituted phenyl group, and at least one of B101 to B104 is said optionally substituted phenyl group
• where B201 to B204 are independently selected from the group consisting of a hydrogen atom, a methyl group, a carboxyl group and an alkoxycarbonyl group, and at least one of B201 to B204 is said carboxyl or alkoxycarbonyl group, or
• B201 and B203 are independently a hydrogen atom or a methyl group, and B202 and B204 are bonded in a structure of —C(═O)OC(═O)—, thereby forming a ring structure with C—C in formula (B2).

An electrophotographic apparatus, comprising:

• an electrophotographic photosensitive member, a charging unit, an exposing unit, a developing unit and a transfer unit;
• the electrophotographic photosensitive member comprising in this order a support, an undercoat layer, a charge generation layer and a charge transport layer, said undercoat layer comprising a cured product of an electron transport material, a polyolefin resin and an isocyanate compound having two or more isocyanate groups, wherein
• the electron transport material has at least one member selected from the group consisting of a hydroxyl group, a thiol group, an amino group and a carboxyl group, and
• the polyolefin resin has at least one member selected from the group consisting of a carboxyl group, an alkoxycarbonyl group and an anhydrous carboxylic acid structure and an optionally substituted phenyl group, the polyolefin resin having a structure represented by formula (B1) and a structure represented by formula (B2)
• where B101 to B104 are independently selected from the group consisting of a hydrogen atom, a methyl group and an optionally substituted phenyl group, and at least one of B101 to B104 is said optionally substituted phenyl group
• where B201 to B204 are independently selected from the group consisting of a hydrogen atom, a methyl group, a carboxyl group and an alkoxycarbonyl group, and at least one of B201 to B204 is said carboxyl or alkoxycarbonyl group, or
• B201 and B203 are independently a hydrogen atom or a methyl group, and B202 and B204 are bonded in a structure of —C(═O)OC(═O)—, thereby forming a ring structure with C—C in formula (B2).