Electrophotographic photosensitive member, process cartridge, and image forming apparatus

Patent metadata

Field	Value
Publication number	US-12468255-B2
Application number	US-202418636961-A
Country	US
Kind code	B2
Filing date	Apr 16, 2024
Priority date	Apr 18, 2023
Publication date	Nov 11, 2025
Grant date	Nov 11, 2025

Abstract

An electrophotographic photosensitive member includes a conductive substrate, an intermediate layer provided on the conductive substrate, and a photosensitive layer provided on the intermediate layer. The intermediate layer contains a specific polyamide resin and specific inorganic particles. The specific inorganic particles each include a metal oxide particle and a surface treatment layer covering at least a part of the surface of the metal oxide particle. The surface treatment layers contain a component derived from an organic siloxane compound and at least one of aluminum oxide and silica. The specific polyamide resin includes a first repeating unit derived from an aliphatic dicarboxylic acid with a carbon number of at least 8 and no greater than 20 and a second repeating unit derived from a diamine compound with a cycloalkane structure.

First claim

What is claimed is:

1 . An electrophotographic photosensitive member comprising:
a conductive substrate; an intermediate layer provided on the conductive substrate; and a photosensitive layer provided on the intermediate layer, wherein the intermediate layer contains a specific polyamide resin and specific inorganic particles, the specific inorganic particles each include a metal oxide particle and a surface treatment layer covering at least a part of a surface of the metal oxide particle, the surface treatment layers contain a component derived from an organic siloxane compound and at least one of aluminum oxide and silica, the specific polyamide resin includes a first repeating unit derived from an aliphatic dicarboxylic acid with a carbon number of at least 8 and no greater than 20 and a second repeating unit derived from a diamine compound with a cycloalkane structure, and a total percentage content of the first repeating unit and the second repeating unit to all repeating units included in the specific polyamide resin is at least 80% by mol.

2 . The electrophotographic photosensitive member according to claim 1 , wherein
the metal oxide particles are titanium oxide particles.

3 . The electrophotographic photosensitive member according to claim 1 , wherein
the diamine compound with the cycloalkane structure includes isophoronediamine.

4 . The electrophotographic photosensitive member according to claim 1 , wherein
the organic siloxane compound includes methylhydrogenpolysiloxane.

5 . The electrophotographic photosensitive member according to claim 1 , wherein
the surface treatment layers contain
only the aluminum oxide, the silica, and a component derived from the organic siloxane compound, or
only the silica and a component derived from the organic siloxane compound.

6 . The electrophotographic photosensitive member according to claim 1 , wherein
the specific polyamide resin does not include a repeating unit derived from an aromatic dicarboxylic acid.

7 . The electrophotographic photosensitive member according to claim 1 , wherein
the intermediate layer has a thickness of at least 1 μm and no greater than 20 μm.

8 . The electrophotographic photosensitive member according to claim 1 , wherein
the specific inorganic particles have a content of at least 50 parts by mass and no greater than 1000 parts by mass relative to 100 parts by mass of the specific polyamide resin in the intermediate layer.

9 . The electrophotographic photosensitive member according to claim 1 , wherein
the specific inorganic particles have a number average primary particle diameter of at least 5 nm and no greater than 100 nm.

10 . The electrophotographic photosensitive member according to claim 1 , wherein
the photosensitive layer is a single layer.

11 . The electrophotographic photosensitive member according to claim 1 , wherein
the photosensitive layer includes a charge generating layer and a charge transport layer, the charge generating layer is provided on the intermediate layer, and the charge transport layer is provided on the charge generating layer.

12 . A process cartridge comprising
the electrophotographic photosensitive member according to claim 1 .

13 . An image forming apparatus comprising:
an image bearing member; a charger that charges a surface of the image bearing member; a light exposure device that exposes the charged surface of the image bearing member to light to form an electrostatic latent image on the surface of the image bearing member; a development device that develops the electrostatic latent image into a toner image by supplying toner to the surface of the image bearing member; and a transfer device that transfers the toner image from the image bearing member to a transfer target, wherein the image bearing member is the electrophotographic photosensitive member according to claim 1 .

Assignees

• Kyocera Document Solutions Inc

Inventors

• Iwashita Yuko
• Azuma Jun
• Maruo Keiji
• Ezure Kazuaki
• Yoshida Yuichi
• Sugimoto Kazutaka
• Oishi Yasuhiro
• Hamasaki Kazunari

Classifications

• G03G7/0053

  Intermediate layers for image-receiving members · CPC title

• G03G5/142

  Inert intermediate layers · CPC title

• G03G2215/00957

  Compositions · CPC title

• G03G15/095 Primary

  Removing excess solid developer {, e.g. fog preventing} · CPC title

• G03G5/144

  comprising inorganic material · CPC title