Electrophotographic photoreceptor, process cartridge, and image forming apparatus

A process cartridge which is attachable to and detachable from an image forming apparatus, and comprises an electrophotographic photoreceptor, the electrophotographic photoreceptor comprising:

• a conductive substrate,
• at least a photosensitive layer on the conductive substrate, and
• a surface layer located at a surface of the photosensitive layer side of the electrophotographic photoreceptor,
• wherein
• the surface layer contains fluorine containing resin particles and a fluoro graft polymer having a fluoroalkyl group having 1 to 7 carbon atoms,
• the fluoro graft polymer having a fluoroalkyl group having 1 to 7 carbon atoms has a molecular distribution such that an area in a gel permeation chromatography (GPC) chart of the fluoro graft polymer for a polystyrene equivalent molecular weight of 700,000 or more is about 5% to about 20% of a total area in the GPC chart of the fluoro graft polymer,
• a maximum peak in the GPC chart of the fluoro graft polymer is present in a range where a polystyrene equivalent molecular weight is from about 50,000 to about 150,000, and
• the fluorine content in the fluoro graft polymer is from about 10% by weight to about 30% by weight with respect to a weight of the fluoro graft polymer.

An image forming apparatus comprising:

• an electrophotographic photoreceptor comprising:
• a conductive substrate,
• at least a photosensitive layer on the conductive substrate, and
• a surface layer located at a surface of the photosensitive layer side of the electrophotographic photoreceptor,
• wherein
• the surface layer contains fluorine containing resin particles and a fluoro graft polymer having a fluoroalkyl group having 1 to 7 carbon atoms,
• the fluoro graft polymer having a fluoroalkyl group having 1 to 7 carbon atoms has a molecular distribution such that an area in a gel permeation chromatography (GPC) chart of the fluoro graft polymer for a polystyrene equivalent molecular weight of 700,000 or more is about 5% to about 20% of a total area in the GPC chart of the fluoro graft polymer,
• a maximum peak in the GPC chart of the fluoro graft polymer is present in a range where a polystyrene equivalent molecular weight is from about 50,000 to about 150,000, and
• the fluorine content in the fluoro graft polymer is from about 10% by weight to about 30% by weight with respect to a weight of the fluoro graft polymer;
• a developing unit that develops an electrostatic latent image formed on the electrophotographic photoreceptor by an electrostatic latent image developer to form a toner image;
• a transfer unit that transfers the toner image formed on the electrophotographic photoreceptor to a transfer receiving body;
• and
• a fixing unit that fixes the toner image transferred to the transfer receiving body.