ELECTROPHOTOGRAPHIC PHOTOSENSITIVE MEMBER, PROCESS CARTRIDGE, AND ELECTROPHOTOGRAPHIC APPARATUS

• US 20130202327A1
• Filed: 10/25/2011
• Published: 08/08/2013
• Est. Priority Date: 10/29/2010
• Status: Active Grant

• Current Assignee: Canon Kabushiki Kaisha (Canon Inc.)
• Original Assignee: Canon Kabushiki Kaisha (Canon Inc.)
• Inventors: Murai, Shio, Ogaki, Harunobu, Noguchi, Kazunori, Anezaki, Takashi, Shida, Kazuhisa, Okuda, Atsushi
• Granted Patent: US 8,921,020 B2
• Time in Patent Office: Days
• US Class Current: 399/111
• CPC Class Codes: C08G 63/193 containing two or more aromatic rings
• CPC Class Codes: G03G 5/0542 Polyvinylalcohol, polyallylalcohol; Derivatives thereof, e.g. polyvinylesters, polyvinylethers, polyvinylamines
• CPC Class Codes: G03G 5/056 Polyesters
• CPC Class Codes: G03G 5/0564 Polycarbonates
• CPC Class Codes: G03G 5/078 comprising silicon atoms
• CPC Class Codes: G03G 5/14752 Polyesters
• CPC Class Codes: G03G 5/14756 Polycarbonates
• CPC Class Codes: G03G 5/14773 Polycondensates comprising silicon atoms in the main chain
• CPC Class Codes: G03G 5/14786 Macromolecular compounds characterised by specific side-chain substituents or end groups

Abstract

Provided is an electrophotographic photosensitive member, including: a support; and a photosensitive layer, which is provided on the support, in which: a surface layer of the electrophotographic photosensitive member includes a terminal siloxane-containing polyester resin having a specific structure; and a lower layer provided in contact with the surface layer includes a polycarbonate resin, a polyester resin, or a polyvinyl acetal resin, having a specific structure.

Claims

1. An electrophotographic photosensitive member, comprising:

a support,

a charge-generating layer which is provided on the support and comprises a charge-generating substance, and

a charge-transporting layer which is provided on the charge-generating layer and comprises a charge-transporting substance;

wherein;

a surface layer of the electrophotographic photosensitive member comprises at least one resin selected from the group consisting of a resin B having a structural unit represented by the following formula (B) and a resin C having a structural unit represented by the following formula (C); and

a lower layer in contact with the surface layer comprises at least one resin selected from the group consisting of a polycarbonate resin D having a repeating structural unit represented by the following formula (D), a polyester resin E having a repeating structural unit represented by the following formula (E), and a polyvinyl acetal resin F having a repeating structural unit represented by the following formula (F-A), a repeating structural unit represented by the following formula (F-B), and a repeating structural unit represented by the following formula (F-C);

2. An electrophotographic photosensitive member according to claim 1, wherein:

the content of a siloxane moiety in the resin B is not less than 10% by mass and not more than 50% by mass relative to the total mass of the resin B, and

the content of a siloxane moiety in the resin C is not less than 5% by mass and not more than 25% by mass relative to the total mass of the resin C.

3. An electrophotographic photosensitive member according to claim 1, wherein:

the lower layer in contact with the surface layer is the charge-transporting layer, and

the charge-transporting layer comprises at least one resin selected from the group consisting of the polycarbonate resin D and the polyester resin E.

4. An electrophotographic photosensitive member according to claim 1, wherein:

the lower layer in contact with the surface layer is the charge-generating layer, and

the charge-generating layer comprises the polyvinyl acetal resin F.

5. An electrophotographic photosensitive member according to claim 1, wherein the content of the resin B and the resin C is not less than 5% by mass and not more than 100% by mass relative to the total mass of whole resin in the surface layer.

6. An electrophotographic photosensitive member according to claim 1, wherein, in the formula (A), the average of “

a”

in the resin B and the resin C ranges from 20 to 40.

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

the 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.

8. An electrophotographic apparatus, comprising:

the electrophotographic photosensitive member according to claim 1;

a charging device;

an exposing device;

a developing device; and

a transferring device.