Process cartridge and electrophotographic image forming apparatus

• US 10,452,021 B2
• Filed: 11/21/2018
• Issued: 10/22/2019
• Est. Priority Date: 11/24/2017
• Status: Active Grant

• Current Assignee: Canon Kabushiki Kaisha (Canon Inc.)
• Original Assignee: Canon Kabushiki Kaisha (Canon Inc.)
• Inventors: Miura, Daisuke, Iwasaki, Shuhei, Sakakibara, Akira, Yamaai, Tatsuya, Noguchi, Kazunori, Ogaki, Harunobu, Hagiwara, Kazunari, Kawaguchi, Yuji
• Primary Examiner(s): Vajda, Peter L
• Application Number:
  US16/198,105
• Publication Number:
  US 20190163120A1
• Time in Patent Office: 335 Days
• CPC Class Codes: G03G 15/0233 Structure, details of the charging member, e.g. chemical composition, surface properties
• CPC Class Codes: G03G 15/75 Details relating to xerographic drum, band or plate, e.g. replacing, testing electrographic recording members per se G03G5/00
• CPC Class Codes: G03G 21/1814 Details of parts of process cartridge, e.g. for charging, transfer, cleaning, developing G03G21/1835 takes precedence
• CPC Class Codes: G03G 5/0507 Inorganic compounds
• CPC Class Codes: G03G 5/056 Polyesters
• CPC Class Codes: G03G 5/0564 Polycarbonates
• CPC Class Codes: G03G 5/0567 Other polycondensates comprising oxygen atoms in the main chain; Phenol resins
• CPC Class Codes: G03G 5/14704 comprising inorganic material
• CPC Class Codes: G03G 5/14752 Polyesters
• CPC Class Codes: G03G 5/14756 Polycarbonates

Abstract

A process cartridge configured to be detachably attachable to a main body of an electrophotographic image forming apparatus, in which an occurrence of an image failure is suppressed, wherein the process cartridge includes an electrophotographic photosensitive member and a cleaning member arranged in contact with the electrophotographic photosensitive member, wherein an elastic deformation modulus of a surface layer of the electrophotographic photosensitive member is 35% or larger, and the cleaning member is formed of a urethane foam, wherein a density of the urethane foam is 200 to 500 kg/cm³, and a 25% compressive load of the urethane foam is 0.3 MPa or smaller.

Claims

1. A process cartridge configured to be detachably attachable to a main body of an electrophotographic image forming apparatus, the process cartridge comprising:

an electrophotographic photosensitive member and a cleaning member arranged in contact with the electrophotographic photosensitive member, wherein

an elastic deformation modulus of a surface layer of the electrophotographic photosensitive member is 35% or larger, and

the cleaning member is formed of a urethane foam, said urethane foam having a density of 200 to 500 kg/m³ and a 25% compressive load of 0.3 MPa or smaller.

2. The process cartridge according to claim 1, wherein the urethane foam comprises a cell structure with a cell diameter of 350 μ

m or smaller.

3. The process cartridge according to claim 1, wherein the surface layer of the electrophotographic photosensitive member comprises a charge transporting substance and a resin having a structure represented by formula (II)

4. The process cartridge according to claim 1, wherein the surface layer of the electrophotographic photosensitive member comprises a charge transporting substance and a resin having a structure represented by formula (I) and a structure represented by formula (II)

5. The process cartridge according to claim 4, wherein the structure represented by formula (II) comprises a structure represented by formula (II-1) and a structure represented by formula (II-3)

6. The process cartridge according to claim 4, wherein the structure represented by formula (I) has a structure represented by formula (I-1)

7. The process cartridge according to claim 4, wherein the surface layer of the electrophotographic photosensitive member further comprises a silica particle having a volume average particle diameter of 30 to 400 nm.

8. An electrophotographic image forming apparatus having a process cartridge configured to be detachably attachable to a main body of the electrophotographic image forming apparatus, said process cartridge comprising an electrophotographic photosensitive member and a cleaning member arranged in contact with the electrophotographic photosensitive member, wherein

an elastic deformation modulus of a surface layer of the electrophotographic photosensitive member is 35% or larger, and

the cleaning member is formed of a urethane foam, said urethane foam having a density of 200 to 500 kg/m³ and a 25% compressive load of 0.3 MPa or smaller.