Electrophotographic photosensitive member, process cartridge and electrophotographic apparatus

• US 8,765,335 B2
• Filed: 06/06/2012
• Issued: 07/01/2014
• Est. Priority Date: 07/29/2011
• Status: Active Grant

• Current Assignee: Canon Ayutthaya Limited (Canon Inc.)
• Original Assignee: Canon Ayutthaya Limited (Canon Inc.)
• Inventors: Tanaka, Daisuke, Sugiyama, Kazumichi, Nishida, Tsutomu
• Primary Examiner(s): Chea, Thorl
• Application Number:
  US13/490,419
• Publication Number:
  US 20130029256A1
• Time in Patent Office: 755 Days
• Field of Search: 430/56, 430/70, 430/58.05, 430/58.85, 430/59.2, 430/66, 399/111, 399/159
• US Class Current: 430/56
• CPC Class Codes: G03G 15/751 relating to drum G03G15/757 takes precedence
• CPC Class Codes: G03G 2215/00957 Compositions
• CPC Class Codes: G03G 5/051 Organic non-macromolecular compounds
• CPC Class Codes: G03G 5/0514 not comprising cyclic groups
• CPC Class Codes: G03G 5/0517 comprising one or more cyclic groups consisting of carbon-atoms only
• CPC Class Codes: G03G 5/056 Polyesters
• CPC Class Codes: G03G 5/0564 Polycarbonates
• CPC Class Codes: G03G 5/0578 Polycondensates comprising silicon atoms in the main chain
• CPC Class Codes: G03G 5/14752 Polyesters
• CPC Class Codes: G03G 5/14756 Polycarbonates
• CPC Class Codes: G03G 5/14786 Macromolecular compounds characterised by specific side-chain substituents or end groups
• CPC Class Codes: G03G 5/14791 Macromolecular compounds characterised by their structure, e.g. block polymers, reticulated polymers, or by their chemical properties, e.g. by molecular weight or acidity

Abstract

The electrophotographic photosensitive member includes a surface layer containing (α), (β) and (γ).

Claims

1. An electrophotographic photosensitive member, comprising:

a support;

a photosensitive layer formed on the support;

wherein a surface layer of the electrophotographic photosensitive member comprises;

(α

) at least one resin selected from the group consisting of a polycarbonate resin not having a siloxane structure at the end, and a polyester resin not having a siloxane structure at the end;

(β

) at least one resin selected from the group consisting of a polycarbonate resin having a siloxane structure represented by the following formula (D-S) at the end thereof a polyester resin having a siloxane structure represented by the following formula (D-S) at the end thereof, and an acrylic resin having a siloxane structure represented by the following formula (F-1-

     2) at the end thereof;

2. The electrophotographic photosensitive member according to claim 1,

wherein a content of the above (γ

) is not less than 0.001% by mass and not more than 1% by mass based on the total mass of the surface layer.

3. The electrophotographic photosensitive member according to claim 2,

wherein a content of the above (γ

) is not less than 0.001% by mass and not more than 0.5% by mass based on the total mass of the surface layer.

4. The electrophotographic photosensitive member according to claim 1,

wherein the polycarbonate resin not having a siloxane structure at the end is a polycarbonate resin A having a repeating structural unit represented by the following formula (A):

5. The electrophotographic photosensitive member according to claim 1,

wherein the polyester resin not having a siloxane structure at the end is a polyester resin B having a repeating structural unit represented by the following formula (B):

6. The electrophotographic photosensitive member according to claim 1,

wherein the polycarbonate resin having a siloxane structure represented by the formula (D-S) at the end is a polycarbonate resin D having a repeating structural unit represented by the following formula (A′

) and an end structure represented by the following formula (D);

7. The electrophotographic photosensitive member according to claim 1,

wherein the polyester resin having a siloxane structure represented by the formula (D-S) at the end is a polyester resin E having a repeating structural unit represented by the following formula (B′

) and an end structure represented by the following formula (D);

8. The electrophotographic photosensitive member according to claim 1,

wherein the acrylic resin having a siloxane structure represented by the formula (F-1- 2) at the end is

an acrylic resin F having a repeating structural unit represented by the following formula (F-1) and a repeating structural unit represented by the following formula (F-2), or

an acrylic resin F having a repeating structural unit represented by the following formula (F-1) and a repeating structural unit represented by the following formula (F-3):

9. The electrophotographic photosensitive member according to claim 1,

wherein a content of the (β

) in the surface layer is not less than 1% by mass and not more than 50% by mass based on the total mass of the (α

).

10. A process cartridge detachably attachable to a main body of an electrophotographic apparatus, wherein the process cartridge integrally supports:

an electrophotographic photosensitive member according to claim 1, and

at least one device selected from the group consisting of a charging device, a developing device, a transferring device, and a cleaning device.

11. An electrophotographic apparatus comprising:

an electrophotographic photosensitive member according to claim 1;

a charging device;

an exposure device;

a developing device; and

a transferring device.

12. The electrophotographic photosensitive member according to claim 1,

wherein the photosensitive layer comprises a charge generation layer and a charge transport layer formed on the charge generation layer, and

wherein the charge transport layer is the surface layer.