Electrophotographic photosensitive member, process cartridge, and electrophotographic image-forming apparatus

• US 10,539,892 B2
• Filed: 05/28/2019
• Issued: 01/21/2020
• Est. Priority Date: 05/31/2018
• Status: Active Grant

• Current Assignee: Canon Kabushiki Kaisha (Canon Inc.)
• Original Assignee: Canon Kabushiki Kaisha (Canon Inc.)
• Inventors: Nishida, Tsutomu, Ishiduka, Yuka, Kaku, Kenichi, Nakamura, Nobuhiro, Watanabe, Hiroyuki, Shimozawa, Hideharu, Okuda, Atsushi
• Primary Examiner(s): Vajda, Peter L
• Application Number:
  US16/423,393
• Publication Number:
  US 20190369515A1
• Time in Patent Office: 238 Days
• CPC Class Codes: C08L 33/14 of esters containing halogen, nitrogen, sulfur, or oxygen atoms in addition to the carboxy oxygen
• CPC Class Codes: G03G 21/18 using a processing cartridge , whereby the process cartridge comprises at least two image processing means in a single unit
• CPC Class Codes: G03G 2221/183 Process cartridge
• CPC Class Codes: G03G 5/072 comprising pending monoamine groups
• CPC Class Codes: G03G 5/078 comprising silicon atoms
• CPC Class Codes: G03G 5/1473 Polyvinylalcohol, polyallylalcohol; Derivatives thereof, e.g. polyvinylesters, polyvinylethers, polyvinylamines
• CPC Class Codes: G03G 5/14734 Polymers comprising at least one carboxyl radical, e.g. polyacrylic acid, polycrotonic acid, polymaleic acid; Derivatives thereof, e.g. their esters, salts, anhydrides, nitriles, amides
• 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
• CPC Class Codes: G03G 5/14795 Macromolecular compounds characterised by their physical properties
• CPC Class Codes: G03G 9/16 Developers not provided for in groups G03G9/06 - G03G9/135, e.g. solutions, aerosols

Abstract

Provided is an electrophotographic photosensitive member that is reduced in exposure memory and is excellent in electrical characteristics and durability. The electrophotographic photosensitive member includes in this order: a support; a photosensitive layer; and a protective layer, wherein the protective layer contains a resin having a structure represented by the following general formula (1) and a structure represented by the following general formula (2).

Claims

1. An electrophotographic photosensitive member comprising in this order:

a support;

a photosensitive layer; and

a protective layer,

wherein the protective layer contains a resin having a structure represented by the following general formula (1) and a structure represented by the following general formula (2);

2. The electrophotographic photosensitive member according to claim 1, wherein a molar ratio of the structure represented by the general formula (1) to the structure represented by the general formula (2) is 0.05 or more and 0.70 or less.

3. The electrophotographic photosensitive member according to claim 1, wherein the protective layer contains the resin further having a structure represented by the following general formula (3):

4. The electrophotographic photosensitive member according to claim 1, wherein a ratio of a total mass of structural units each having a charge-transporting ability to a mass of an entirety of the protective layer is 0.4 or more and 1.0 or less, and a ratio of a total mass of the structural units represented by the general formulae (1) and (2) to the total mass of the structural units each having a charge-transporting ability is 0.1 or more and 1.0 or less.

5. The electrophotographic photosensitive member according to claim 1, wherein R⁷ in the general formula (1) represents a hydrogen atom, and R¹⁷ in the general formula (2) represents a hydrogen atom.

6. The electrophotographic photosensitive member according to claim 3, wherein the structure represented by the general formula (3) comprises a structure represented by the following general formula (31):

7. The electrophotographic photosensitive member according to claim 1, wherein R¹ in the general formula (1) and R¹¹ in the general formula (2) each independently represent an alkylene group having 2 or more and 5 or less carbon atoms.

8. An electrophotographic photosensitive member comprising in this order:

a support;

a photosensitive layer; and

a protective layer,

wherein the protective layer contains a polymer of a composition containing a polymerizable compound represented by the following general formula (1A) and a polymerizable compound represented by the following general formula (2A);

9. A process cartridge comprising:

the electrophotographic photosensitive member; and

at least one unit selected from the group consisting of a charging unit, a developing unit, and a cleaning unit,

the process cartridge integrally supporting the electrophotographic photosensitive member and the at least one unit, and being removably mounted onto a main body of an electrophotographic image-forming apparatus

wherein the electrophotographic photosensitive member comprises in this order;

a support;

a photosensitive layer; and

a protective layer,

wherein the protective layer contains a resin having a structure represented by the following general formula (1) and a structure represented by the following general formula (2);

10. An electrophotographic image-forming apparatus comprising:

the electrophotographic photosensitive member; and

at least one unit selected from the group consisting of a charging unit, an exposing unit, a developing unit, and a transferring unit

wherein the electrophotographic photosensitive member comprises in this order;

a support;

a photosensitive layer; and

a protective layer,

wherein the protective layer contains a resin having a structure represented by the following general formula (1) and a structure represented by the following general formula (2);