Electrophotographic photosensitive member, process cartridge, and electrophotographic apparatus

• US 10,558,132 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: Ishiduka, Yuka, Nishida, Tsutomu, Okuda, Atsushi, Watanabe, Hiroyuki, Shimozawa, Hideharu, Nakamura, Nobuhiro, Kaku, Kenichi, Miura, Daisuke, Nakata, Koichi, Nonaka, Masaki, Takahashi, Koji, Mori, Haruki
• Primary Examiner(s): Vajda, Peter L
• Application Number:
  US16/423,337
• Publication Number:
  US 20190369511A1
• Time in Patent Office: 259 Days
• CPC Class Codes: G03G 5/0525 Coating methods
• CPC Class Codes: G03G 5/072 comprising pending monoamine groups
• CPC Class Codes: G03G 5/075 obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds G03G5/078 takes precedence
• 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

Abstract

An electrophotographic photosensitive member includes a support and a surface layer, in which the surface layer contains a copolymer of a composition which contains at least a compound represented by the following general formula (1) and a compound represented by the following general formula (2), a content of the compound represented by the general formula (1) in the composition is 25 mass % or more and 70 mass % or less with respect to a total content of the compound represented by the general formula (1) and the compound represented by the general formula (2), and the total content of the compound represented by the general formula (1) and the compound represented by the general formula (2) is 55 mass % or more with respect to a total mass of the composition.

Claims

1. An electrophotographic photosensitive member comprising a support and a surface layer, wherein

the surface layer contains a copolymer of a composition which contains at least a compound represented by the following general formula (1) and a compound represented by the following general formula (2),

a content of the compound represented by the general formula (1) in the composition is 25 mass % or more and 70 mass % or less with respect to a total content of the compound represented by the general formula (1) and the compound represented by the general formula (2), and

the total content of the compound represented by the general formula (1) and the compound represented by the general formula (2) is 55 mass % or more with respect to a total mass of the composition:

2. The electrophotographic photosensitive member according to claim 1, wherein a charge generating layer, a charge transporting layer, and the surface layer are provided on the support in this order, a film thickness of the charge transporting layer is 10 μ

m or more and 16 μ

m or less, and a film thickness of the surface layer is 17.0% or more and 21.5% or less with respect to a sum of the film thickness of the surface layer and the film thickness of the charge transporting layer.

3. The electrophotographic photosensitive member according to claim 2, wherein at least one type of charge transporting substance in the charge transporting layer has a glass transition temperature of 70°

C. or higher, and a content of the charge transporting substance having the glass transition temperature of 70°

C. or higher is 20 mass % or more with respect to a content of all the charge transporting substances in the charge transporting layer.

4. A process cartridge integrally supporting an electrophotographic photosensitive member and at least one unit selected from the group consisting of a charging unit, a developing unit, a transfer unit, and a cleaning unit, the process cartridge being detachably attachable to a main body of an electrophotographic apparatus,

wherein the electrophotographic photosensitive member includes a support and a surface layer,

the surface layer contains a copolymer of a composition which contains at least a compound represented by the following general formula (1) and a compound represented by the following general formula (2),

a content of the compound represented by the general formula (1) in the composition is 25 mass % or more and 70 mass % or less with respect to a total content of the compound represented by the general formula (1) and the compound represented by the general formula (2), and

the total content of the compound represented by the general formula (1) and the compound represented by the general formula (2) is 55 mass % or more with respect to a total mass of the composition:

5. An electrophotographic apparatus comprising an electrophotographic photosensitive member, a charging unit, an exposure unit, a developing unit and a transfer unit,

wherein the electrophotographic photosensitive member includes a support and a surface layer,

the surface layer contains a copolymer of a composition which contains at least a compound represented by the following general formula (1) and a compound represented by the following general formula (2),

a content of the compound represented by the general formula (1) in the composition is 25 mass % or more and 70 mass % or less with respect to a total content of the compound represented by the general formula (1) and the compound represented by the general formula (2), and

the total content of the compound represented by the general formula (1) and the compound represented by the general formula (2) is 55 mass % or more with respect to a total mass of the composition: