Process cartridge and electrophotographic apparatus

1. A process cartridge, comprising:

an electrophotographic photoreceptor;

a charging unit configured to charge the electrophotographic photoreceptor through abutment against the electrophotographic photoreceptor;

a developing unit storing a toner and configured to develop an electrostatic latent image formed on the electrophotographic photoreceptor with the toner to form a toner image; and

a cleaning unit configured to remove the toner on the electrophotographic photoreceptor by bringing a blade into abutment against the electrophotographic photoreceptor, wherein

the toner stored in the developing unit includes a toner base containing a coloring agent and a binder resin, and has a surface layer containing an organosilicon polymer, and the organosilicon polymer has a sticking ratio to the toner base of 85 to 99.0% determined by water-washing the toner following shaking at 350 spm for 20 minutes in aqueous media with sucrose and neutral detergent, and

the electrophotographic photoreceptor includes a supporting member and a surface layer, the surface layer having a universal hardness value of 210 to 250 N/mm 2 determined using a flat indenter using a maximum load of 2.0×10 −4 N and an elastic deformation ratio of 37 to 52%, wherein

the surface layer of the electrophotographic photoreceptor comprises a structure represented by formula (A-1) and a structure represented by formula (A-2)

where R represents a hydrogen atom or a methyl group, and n represents an integer of 2 to 5.

2. The process cartridge according to claim 1 , wherein the organosilicon polymer has a partial structure represented by

R 1 —SiO 3/2

where R 1 represents a hydrocarbon group having 1 to 6 carbon atoms,

a content of the organosilicon polymer in the toner is 0.5 to 5.0% by mass, and

the organosilicon polymer forms a protruding shape on the surface layer, the protruding shape having a protrusion height of 40 to 100 nm.

3. The process cartridge according to claim 1 , wherein the surface layer of the electrophotographic photoreceptor has a shape having an Ra of 0.010 to 0.045 μm, and an Sm of 0.005 to 0.060 mm, where Ra is an arithmetic average roughness measured by sweeping the surface layer in its peripheral direction and Sm is an average interval measured by sweeping the surface layer in the peripheral direction.

4. The process cartridge according to claim 1 , wherein the toner has a Martens hardness of 200 to 1,100 MPa measured under a condition of a maximum load of 2.0×10 −4 N.

5. An electrophotographic apparatus comprising:

the process cartridge of claim 1 ;

an exposing unit; and

a transfer unit.

6. The process cartridge according to claim 1 , wherein the organosilicon polymer has a partial structure represented by

R 1 —SiO 3/2

where R 1 represents a hydrocarbon group having 1 to 6 carbon atoms,

a content of the organosilicon polymer in the toner is 0.5 to 5.0% by mass, and

the organosilicon polymer forms a protruding shape on the surface layer, the protruding shape having a protrusion height of 40 to 100 nm.

7. The process cartridge according to claim 1 , wherein the surface layer of the electrophotographic photoreceptor has a shape having an Ra of 0.010 to 0.045 μm and an Sm of 0.005 to 0.060 mm, where Ra is an arithmetic average roughness measured by sweeping the surface layer in its peripheral direction and Sm is an average interval measured by sweeping the surface layer in the peripheral direction.

8. The process cartridge according to claim 2 , wherein the surface layer of the electrophotographic photoreceptor has a shape having an Ra of 0.010 to 0.045 μm, and an Sm of 0.005 to 0.060 mm, where Ra is an arithmetic average roughness measured by sweeping the surface layer in its peripheral direction and Sm is an average interval measured by sweeping the surface layer in the peripheral direction.

9. The process cartridge according to claim 6 , wherein the surface layer of the electrophotographic photoreceptor has a shape having an Ra of 0.010 to 0.045 μm, and an Sm of 0.005 to 0.060 mm, where Ra is an arithmetic average roughness measured by sweeping the surface layer in its peripheral direction and Sm is an average interval measured by sweeping the surface layer in the peripheral direction.

10. The process cartridge according to claim 1 , wherein the toner has a Martens hardness of 200 to 1,100 MPa measured under a condition of a maximum load of 2.0×10 −4 N.

11. The process cartridge according to claim 2 , wherein the toner has a Martens hardness of 200 to 1,100 MPa measured under a condition of a maximum load of 2.0×10 −4 N.

12. The process cartridge according to claim 6 , wherein the toner has a Martens hardness of 200 to 1,100 MPa measured under a condition of a maximum load of 2.0×10 −4 N.

13. The process cartridge according to claim 3 , wherein the toner has a Martens hardness of 200 to 1,100 MPa measured under a condition of a maximum load of 2.0×10 −4 N.

14. The process cartridge according to claim 7 , wherein the toner has a Martens hardness of 200 to 1,100 MPa measured under a condition of a maximum load of 2.0×10 −4 N.

15. The process cartridge according to claim 8 , wherein the toner has a Martens hardness of 200 to 1,100 MPa measured under a condition of a maximum load of 2.0×10 −4 N.

16. The process cartridge according to claim 9 , wherein the toner has a Martens hardness of 200 to 1,100 MPa measured under a condition of a maximum load of 2.0×10 −4 N.