Electrophotographic photosensitive member, process cartridge, and electrophotographic apparatus

A process cartridge comprising:

• an integrally supported electrophotographic photosensitive member;
• and
• at least one device selected from the group consisting of a charging device, a developing device, a transfer device, and a cleaning device, the process cartridge being detachably attachable to an electrophotographic apparatus,
• wherein the electrophotographic photosensitive member includes an electrically conductive support member, an undercoat layer, and a photosensitive layer adjacent to the undercoat layer in this order,
• wherein the undercoat layer contains a polymerized product of a composition including an electron transporting material having a polymerizable functional group, a cross-linking agent, and a thermoplastic polymer having a polymerizable functional group, and at least one particulate material selected from the group consisting of polymer particles having a hollow structure, butadiene rubber particles, acrylic rubber particles, and acrylic/silicone complex rubber particles,
• wherein a content of the electron transporting material in the undercoat layer is 30% by mass or more with respect to a total mass of the composition, and
• wherein a content of the at least one particulate material in the undercoat layer is 20% by mass or more and 60% by mass or less with respect to the content of the electron transporting material.

An electrophotographic apparatus comprising:

• an electrophotographic photosensitive member;
• a charging device;
• an exposure device;
• a developing device;
• and
• a transfer device,
• wherein the electrophotographic photosensitive member includes an electrically conductive support member, an undercoat layer, and a photosensitive layer adjacent to the undercoat layer in this order,
• wherein the undercoat layer contains a polymerized product of a composition including an electron transporting material having a polymerizable functional group, a cross-linking agent, and a thermoplastic polymer having a polymerizable functional group, and at least one particulate material selected from the group consisting of polymer particles having a hollow structure, butadiene rubber particles, acrylic rubber particles, and acrylic/silicone complex rubber particles,
• wherein a content of the electron transporting material in the undercoat layer is 30% by mass or more with respect to a total mass of the composition, and
• wherein a content of the at least one particulate material in the undercoat layer is 20% by mass or more and 60% by mass or less with respect to the content of the electron transporting material.