Electrophotographic photosensitive member, process cartridge and electrophotographic apparatus

• US 10,558,133 B2
• Filed: 05/28/2019
• Issued: 02/11/2020
• Est. Priority Date: 05/31/2018
• Status: Active Grant

• Current Assignee: Canon Kabushiki Kaisha (Canon Inc.)
• Original Assignee: Canon Kabushiki Kaisha (Canon Inc.)
• Inventors: Nakamura, Nobuhiro, Nishida, Tsutomu, Okuda, Atsushi, Ishiduka, Yuka, Watanabe, Hiroyuki, Shimozawa, Hideharu, Kaku, Kenichi, Nakata, Koichi, Mori, Haruki
• Primary Examiner(s): Dote, Janis L
• Application Number:
  US16/423,429
• Publication Number:
  US 20190369516A1
• Time in Patent Office: 259 Days
• Field of Search: 430 58766
• 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

An electrophotographic photosensitive member suppressing potential variation due to repeated use is provided. The electrophotographic photosensitive member is an electrophotographic photosensitive member including a support, a photosensitive layer and a protective layer in this order, wherein the protective layer contains: a resin including a structure represented by a general formula (1) and a structure represented by a general formula (2); and a compound represented by a general formula (3), the molar ratio of the proportion of the structure represented by the general formula (2) to the proportion of the structure represented by the general formula (1) in the resin is 0.0002 to 0.1000 in a molar ratio, and the molar ratio of the content of the compound represented by the general formula (3) to the content of the structure represented by the general formula (1) in the resin in the protective layer is 0.0002 to 0.1000 in a molar ratio.

Claims

1. An electrophotographic photosensitive member comprising a support, a photosensitive layer and a protective layer in this order, wherein

the protective layer comprises:

a resin comprising a structure represented by a general formula (1) and a structure represented by a general formula (2); and

a compound represented by a general formula (3),

the molar ratio of the proportion of the structure represented by the general formula (2) to the proportion of the structure represented by the general formula (1) in the resin is 0.0002 or more and 0.1000 or less, and

the molar ratio of the content of the compound represented by the general formula (3) to the content of the structure represented by the general formula (1) in the resin in the protective layer is 0.0002 or more and 0.1000 or less;

2. The electrophotographic photosensitive member according to claim 1, wherein

the molar ratio of the proportion of the structure represented by the general formula (2) to the proportion of the structure represented by the general formula (1) in the resin is 0.0002 or more and 0.0800 or less, and

the molar ratio of the content of the compound represented by the general formula (3) to the content of the structure represented by the general formula (1) in the resin in the protective layer is 0.0002 or more and 0.0800 or less.

3. The electrophotographic photosensitive member according to claim 1, wherein

the molar ratio of the proportion of the structure represented by the general formula (2) to the proportion of the structure represented by the general formula (1) in the resin is 0.0002 or more and 0.0600 or less, and

the molar ratio of the content of the compound represented by the general formula (3) to the content of the structure represented by the general formula (1) in the resin in the protective layer is 0.0002 or more and 0.0600 or less in a molar ratio.

4. The electrophotographic photosensitive member according to claim 1, wherein

the molar ratio of the content of the structure represented by the general formula (2) in the resin to the content of the compound represented by the general formula (3) in the protective layer is 0.9 or more and 3.0 or less.

5. The electrophotographic photosensitive member according to claim 1, wherein

the resin comprised in the protective layer further comprises a structure represented by a general formula (4):

6. The electrophotographic photosensitive member according to claim 5, wherein

the structure represented by the general formula (4) is a structure represented by the following general formula (5):

7. The electrophotographic photosensitive member according to claim 1, wherein

R¹ in the general formula (1) and R¹⁰ in the general formula (3) are each an alkylene group having two or more and five or less carbon atoms.

8. The electrophotographic photosensitive member according to claim 1, wherein

R⁸ in the general formula (2) is a hydrogen atom.

9. A process cartridge attachable to and detachable from a main body of an electrophotographic apparatus, the process cartridge comprising and integrally supporting:

an electrophotographic photosensitive member comprising a support, a photosensitive layer and a protective layer in this order; and

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

the protective layer comprises;

a resin comprising a structure represented by a general formula (1) and a structure represented by a general formula (2); and

a compound represented by a general formula (3),

the molar ratio of the proportion of the structure represented by the general formula (2) to the proportion of the structure represented by the general formula (1) in the resin is 0.0002 or more and 0.1000 or less, and

the molar ratio of the content of the compound represented by the general formula (3) to the content of the structure represented by the general formula (1) in the resin in the protective layer is 0.0002 or more and 0.1000 or less in a molar ratio;

10. An electrophotographic apparatus comprising:

an electrophotographic photosensitive member comprising a support, a photosensitive layer and a protective layer in this order;

a charging unit;

an exposure unit;

a developing unit; and

a transferring unit, wherein

the protective layer comprises;

a resin comprising a structure represented by a general formula (1) and a structure represented by a general formula (2); and

a compound represented by a general formula (3),

the molar ratio of the proportion of the structure represented by the general formula (2) to the proportion of the structure represented by the general formula (1) in the resin is 0.0002 or more and 0.1000 or less, and

the molar ratio of the content of the compound represented by the general formula (3) to the content of the structure represented by the general formula (1) in the resin in the protective layer is 0.0002 or more and 0.1000 or less;

11. An electrophotographic photosensitive member comprising:

a photosensitive layer and a protective layer in this order above a support, wherein

the protective layer is a film obtained by curing a coating solution for protective layers,

the coating solution for protective layers comprises;

a solvent;

a resin comprising a structure represented by a general formula (1-A) below and a structure represented by a general formula (2-A) below; and

a compound represented by a general formula (3) below,

the molar ratio of the proportion of the structure represented by the general formula (2-A) to the proportion of the structure represented by the general formula (1-A) in the resin is 0.0002 or more and 0.1000 or less, and

the molar ratio of the content of the compound represented by the general formula (3) to the content of the structure represented by the general formula (1-A) in the resin in the protective layer is 0.0002 or more and 0.1000 or less;