ELECTROPHOTOGRAPHIC PHOTOSENSITIVE MEMBER, PROCESS CARTRIDGE AND ELECTROPHOTOGRAPHIC APPARATUS

• US 20150185634A1
• Filed: 12/11/2014
• Published: 07/02/2015
• Est. Priority Date: 12/26/2013
• Status: Abandoned Application

• Current Assignee: Canon Ayutthaya Limited (Canon Inc.)
• Original Assignee: Canon Ayutthaya Limited (Canon Inc.)
• Inventors: Sekiya, Michiyo, Ito, Yota, Nakamura, Nobuhiro
• Application Number:
  US14/568,052
• Publication Number:
  US 20150185634A1
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: G03G 5/14 Inert intermediate or cover layers for charge-receiving layers G03G5/04 takes precedence
• CPC Class Codes: G03G 5/142 Inert intermediate layers
• CPC Class Codes: G03G 5/144 comprising inorganic material

Abstract

An electrophotographic photosensitive member including a support, a first intermediate layer formed on the support, a second intermediate layer formed directly on the first intermediate layer, a charge generating layer formed directly on the second intermediate layer, and a hole transporting layer formed on the charge generating layer, wherein the first intermediate layer contains a binder resin and a titanium oxide particle, and the second intermediate layer contains a polymerized product of a composition including an electron transporting substance having a polymerizable functional group and a crosslinking agent.

Claims

1. An electrophotographic photosensitive member comprising:

a support;

a first intermediate layer formed on the support;

a second intermediate layer formed directly on the first intermediate layer;

a charge generating layer formed directly on the second intermediate layer; and

a hole transporting layer formed on the charge generating layer,

wherein the first intermediate layer comprises a binder resin and a titanium oxide particle, and

the second intermediate layer comprises a polymerized product of a composition comprising;

an electron transporting substance having a polymerizable functional group; and

a crosslinking agent,

wherein the content of the electron transporting substance in the second intermediate layer is 25% by mass or more based on the total mass of the composition.

2. The electrophotographic photosensitive member according to claim 1, wherein the content of the electron transporting substance is 30% by mass or more and 70% by mass or less based on the total mass of the composition.

3. The electrophotographic photosensitive member according to claim 1, wherein the thickness of the second intermediate layer is ⅙

to 2 times the thickness of the first intermediate layer.

4. The electrophotographic photosensitive member according to claim 1, wherein the content of the electron transporting substance based on the total mass of the composition of the second intermediate layer is ⅓

to 1 time the content of the titanium oxide particle based on the total mass of the first intermediate layer.

5. The electrophotographic photosensitive member according to claim 1, wherein the titanium oxide particle has a volume average particle size of 260 nm or less.

6. The electrophotographic photosensitive member according to claim 1, wherein the composition of the second intermediate layer further comprises a thermoplastic resin having a polymerizable functional group.

7. The electrophotographic photosensitive member according to claim 6, wherein the polymerizable functional group of the thermoplastic resin is one selected from the group consisting of a hydroxy group, a thiol group, an amino group, a carboxyl group and a methoxy group.

8. The electrophotographic photosensitive member according to claim 1, wherein the polymerizable functional group of the electron transporting substance is one selected from the group consisting of a hydroxy group, a thiol group, an amino group, a carboxyl group and a methoxy group.

9. The electrophotographic photosensitive member according to claim 1, wherein the titanium oxide particle is a titanium oxide particle whose surface has not been treated with a surface treating agent.

10. The electrophotographic photosensitive member according to claim 1, wherein the titanium oxide particle is a titanium oxide particle whose surface has been treated with a surface treating agent, and an amount of the surface treating agent used in the surface treatment is 5% by mass or less.

11. A process cartridge integrally supporting the electrophotographic photosensitive member according to claim 1 and at least one unit selected from the group consisting of a charging unit, a developing unit and a cleaning unit, the process cartridge being attachable to and detachable from an electrophotographic apparatus.

12. An electrophotographic apparatus comprising the electrophotographic photosensitive member according to claim 1, an exposing unit, a charging unit, a developing unit and a transfer unit.