Electrophotographic apparatus and process cartridge

A process cartridge comprising:

• an electrophotographic photosensitive member;
• and
• a developing unit, which includes toner, and which is configured to form a toner image on a surface of the electrophotographic photosensitive member with the toner,
• the process cartridge integrally supporting the electrophotographic photosensitive member and the developing unit, and being detachably attachable onto a main body of an electrophotographic apparatus,
• wherein the electrophotographic photosensitive member includes a monolayer type photosensitive layer containing a charge generating substance, a hole transporting substance, an electron transporting substance, and a binder resin,
• wherein the photosensitive layer contains, as the binder resin, a polyarylate resin having a structural unit represented by formula (1) and a structural unit represented by formula (2),
• wherein the toner contains a toner particle,
• wherein the toner particle includes a core containing a binder resin and a shell covering a surface of the core, and
• wherein the shell contains at least one resin selected from the group consisting of a melamine resin, and a resin having a structural unit represented by formula (3):
• in formula (3), R1 represents a hydrogen atom, or a substituted or unsubstituted alkyl group having 1 or more and 10 or less carbon atoms.

An electrophotographic apparatus comprising:

• an electrophotographic photosensitive member;
• a charging unit configured to charge a surface of the electrophotographic photosensitive member;
• an exposing unit configured to irradiate the charged surface of the electrophotographic photosensitive member with light to form an electrostatic latent image on the surface of the electrophotographic photosensitive member;
• a developing unit, which includes toner, and which is configured to develop the electrostatic latent image formed on the surface of the electrophotographic photosensitive member with the toner to form a toner image on the surface of the electrophotographic photosensitive member;
• and
• a transfer unit configured to transfer the toner image from the surface of the electrophotographic photosensitive member onto a transfer target member,
• wherein the electrophotographic photosensitive member includes a monolayer type photosensitive layer containing a charge generating substance, a hole transporting substance, an electron transporting substance, and a binder resin,
• wherein the photosensitive layer contains, as the binder resin, a polyarylate resin having a structural unit represented by formula (1) and a structural unit represented by formula (2),
• wherein the toner contains a toner particle, and
• wherein a surface of the toner particle contains at least one resin selected from the group consisting of a melamine resin, and a resin having a structural unit represented by formula (3):
• in formula (3), R1 represents a hydrogen atom, or a substituted or unsubstituted alkyl group having 1 or more and 10 or less carbon atoms.

A process cartridge comprising:

• an electrophotographic photosensitive member;
• and
• a developing unit, which includes toner, and which is configured to form a toner image on a surface of the electrophotographic photosensitive member with the toner,
• the process cartridge integrally supporting the electrophotographic photosensitive member and the developing unit, and being detachably attachable onto a main body of an electrophotographic apparatus,
• wherein the electrophotographic photosensitive member includes a monolayer type photosensitive layer containing a charge generating substance, a hole transporting substance, an electron transporting substance, and a binder resin,
• wherein the photosensitive layer contains, as the binder resin, a polyarylate resin having a structural unit represented by formula (1) and a structural unit represented by formula (2),
• wherein the toner contains a toner particle, and
• wherein a surface of the toner particle contains at least one resin selected from the group consisting of a melamine resin, and a resin having a structural unit represented by formula (3):
• in formula (3), R1 represents a hydrogen atom, or a substituted or unsubstituted alkyl group having 1 or more and 10 or less carbon atoms.