Electrophotographic photosensitive member, process cartridge, electrophotographic apparatus, charge transport layer forming coating liquid, and method for manufacturing electrophotographic photosensitive member

A process cartridge capable of being removably attached to an electrophotographic apparatus, the process cartridge comprising:

• an electrophotographic photosensitive member including a support member, and a charge generating layer and a charge transport layer that are disposed over the support 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 at least one device being held with the electrophotographic photosensitive member in one body,
• wherein the charge transport layer contains:
• (α) a charge transporting compound;
• (β) a binging resin in a proportion in the range of 50% by mass to 200% by mass relative to the mass of the charge transporting compound;
• (γ) a compound being at least one of xylene and toluene with a content in the range of 0.01% by mass to 2.00% by mass relative to the total mass of the charge transport layer;
• and
• (δ) a cycloalkanone with a content in the range of 0.01% by mass to 1.20% by mass relative to the total mass of the charge transport layer.

An electrophotographic apparatus comprising:

• an electrophotographic photosensitive member including a support member, and a charge generating layer and a charge transport layer that are disposed over the support member;
• a charging device;
• an exposure device;
• a developing device;
• and
• a transfer divide,
• wherein the charge transport layer contains:
• (α) a charge transporting compound;
• (β) a binding resin in a proportion in the range of 50% by mass to 200% by mass relative to the mass of the charge transporting compound;
• (γ) a compound being at least one of xylene and toluene with a content in the range of 0.01% by mass to 2.00% by mass relative to the total mass of the charge transport layer, and
• (δ) a cycloalkanone with a content in the range of 0.01% by mass to 1.20% by mass relative to the total mass of the charge transport layer.

A charge transport layer forming coating liquid comprising:

• (α′) a charge transport material;
• (β′) at least one selected from the group consisting of polycarbonate resins and polyester resins;
• (γ′) at least one of xylene and toluene;
• and
• (δ′) cyclopentanone,
• wherein the proportion of (δ′) in the charge transport layer forming coating liquid is in the range of 50% by mass to 85% by mass relative to the total mass of (γ′) and (δ′).