Electrophotographic photosensitive member, process cartridge, and electrophotographic apparatus

• US 9,772,569 B2
• Filed: 05/31/2016
• Issued: 09/26/2017
• Est. Priority Date: 06/24/2015
• Status: Active Grant

• Current Assignee: Canon Ayutthaya Limited (Canon Inc.)
• Original Assignee: Canon Ayutthaya Limited (Canon Inc.)
• Inventors: Tanaka, Daisuke, Sugiyama, Kazumichi, Murakami, Takeshi, Kawaguchi, Daisuke, Ito, Yota
• Primary Examiner(s): Chea, Thorl
• Application Number:
  US15/169,399
• Publication Number:
  US 20160378002A1
• Time in Patent Office: 483 Days
• CPC Class Codes: G03G 15/75 Details relating to xerographic drum, band or plate, e.g. replacing, testing electrographic recording members per se G03G5/00
• 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 5/144 comprising inorganic material

Abstract

An undercoat layer of an electrophotographic photosensitive member includes a binder resin, and a complex particle composed of a core particle coated with tin oxide doped with zinc.

Claims

1. An electrophotographic photosensitive member comprising:

an electrically conductive support, an undercoat layer on the support, and a photosensitive layer on the undercoat layer,

the undercoat layer comprising a binder resin, and a complex particle composed of a core particle coated with tin oxide doped with zinc, wherein

the core particle is at least one selected from the group consisting of a zinc oxide particle, a titanium oxide particle, a barium sulfate particle and an aluminum oxide particle, and

the mass ratio of the complex particle to the binder resin is 1/1 or more.

2. The electrophotographic photosensitive member according to claim 1, wherein the mass proportion of the tin oxide to the complex particle is 10 to 60% by mass.

3. The electrophotographic photosensitive member according to claim 1, wherein the mass ratio of the complex particle to the binder resin is 4/1 or less.

4. The electrophotographic photosensitive member according to claim 1, wherein the undercoat layer further comprises a tin oxide particle doped with zinc.

5. The electrophotographic photosensitive member according to claim 4, wherein a volume proportion of the tin oxide particle doped with zinc to the complex particle is 0.1 to 20% by volume.

6. The electrophotographic photosensitive member according to claim 1, wherein the binder resin is a phenol resin or a polyurethane resin.

7. The electrophotographic photosensitive member according to claim 1, wherein the electrophotographic photosensitive member has an intermediate layer comprising a polymerized product of a composition containing an electron transporting material having a reactive functional group, and

the intermediate layer is disposed between the undercoat layer and the photosensitive layer.

8. The electrophotographic photosensitive member according to claim 7, wherein the composition comprises the electron transporting material having a reactive functional group, a crosslinking agent, and a resin having a reactive functional group.

9. The electrophotographic photosensitive member according to claim 7, wherein a volume of the complex particle in the total volume of the undercoat layer is 0.2 to 2 times a volume of the electron transporting material in a total volume of the composition of the intermediate layer.

10. A process cartridge detachably mountable on the main body of an electrophotographic apparatus, and integrally supporting an 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 electrophotographic photosensitive member comprising an electrically conductive support, an undercoat layer on the support, and a photosensitive layer on the undercoat layer, and

the undercoat layer comprising a binder resin, and a complex particle composed of a core particle coated with tin oxide doped with zinc, wherein

the core particle is at least one selected from the group consisting of a zinc oxide particle, a titanium oxide particle, a barium sulfate particle and an aluminum oxide particle, and

the mass ratio of the complex particle to the binder resin is 1/1 or more.

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

the electrophotographic photosensitive member comprising an electrically conductive support, an undercoat layer on the support, and a photosensitive layer on the undercoat layer, and

the undercoat layer comprising a binder resin, and a complex particle composed of a core particle coated with tin oxide doped with zinc, wherein

the core particle is at least one selected from the group consisting of a zinc oxide particle, a titanium oxide particle, a barium sulfate particle and an aluminum oxide particle, and

the mass ratio of the complex particle to the binder resin is 1/1 or more.