Electrophotographic photosensitive member, process cartridge and electrophotographic apparatus

• US 10,241,429 B2
• Filed: 04/24/2018
• Issued: 03/26/2019
• Est. Priority Date: 04/27/2017
• Status: Active Grant

• Current Assignee: Canon Kabushiki Kaisha (Canon Inc.)
• Original Assignee: Canon Kabushiki Kaisha (Canon Inc.)
• Inventors: Shimada, Tsuyoshi, Takizawa, Kumiko, Takeuchi, Eileen, Kuroiwa, Ikuyo, Kitamura, Wataru, Tanabe, Kan, Mitsuda, Haruhiko
• Primary Examiner(s): Le, Hoa V
• Application Number:
  US15/960,916
• Publication Number:
  US 20180314173A1
• Time in Patent Office: 336 Days
• CPC Class Codes: B82Y 30/00 Nanotechnology for materials or surface science, e.g. nanocomposites
• CPC Class Codes: G03F 7/092 characterised by backside coating or layers, by lubricating-slip layers or means, by oxygen barrier layers or by stripping-release layers or means
• CPC Class Codes: G03G 15/0216 by bringing a charging member into contact with the member to be charged, e.g. roller, brush chargers
• 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 5/144 comprising inorganic material
• CPC Class Codes: G03G 7/0086 Back layers for image-receiving members; Strippable backsheets

Abstract

There is provided an electrophotographic photosensitive member, a process cartridge and an electrophotographic apparatus that are excellent in charging properties and can suppress residual potential in the case where a strontium titanate particle is used as a metal oxide particle in an undercoat layer of the electrophotographic photosensitive member. An electrophotographic photosensitive member in which an undercoat layer contains a strontium titanate particle having a maximum peak at a position of 2θ=32.20±0.20 (θ represents a Bragg angle) in a CuKα characteristic X-ray diffraction pattern, the maximum peak having a half-value width of 0.10 deg or more and 0.50 deg or less, and a process cartridge and an electrophotographic apparatus each provided with the electrophotographic photosensitive member.

Claims

1. An electrophotographic photosensitive member comprising:

a support;

an undercoat layer; and

a photosensitive layer in the mentioned order, wherein

the undercoat layer comprises a binder resin and a strontium titanate particle,

the strontium titanate particle has a maximum peak at a position of 2θ

=32.20±

0.20 (θ

represents a Bragg angle) in a CuKα

characteristic X-ray diffraction pattern, and

a half-value width of the maximum peak is 0.10 deg or more and 0.50 deg or less.

2. The electrophotographic photosensitive member according to claim 1, wherein a primary particle of the strontium titanate particle has a number average particle diameter of 10 nm or more and 150 nm or less.

3. The electrophotographic photosensitive member according to claim 1, wherein the half-value width is 0.23 deg or more.

4. The electrophotographic photosensitive member according to claim 1, wherein a primary particle of the strontium titanate particle has a number average particle diameter of 10 nm or more and 95 nm or less.

5. The electrophotographic photosensitive member according to claim 1, wherein the strontium titanate particle is surface-treated with a surface treating agent.

6. The electrophotographic photosensitive member according to claim 5, wherein the surface treating agent is a silane coupling agent.

7. The electrophotographic photosensitive member according to claim 6, wherein the silane coupling agent is a silane coupling agent comprising at least one functional group selected from the group consisting of alkyl groups, amino groups and halogen atoms.

8. The electrophotographic photosensitive member according to claim 1, wherein the undercoat layer comprises an electron accepting substance.

9. The electrophotographic photosensitive member according to claim 1, wherein the undercoat layer comprises at least one compound selected from groups represented by the following formulas (1) and (2):

10. 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 an electrophotographic apparatus main body, wherein

the electrophotographic photosensitive member comprises;

a support;

an undercoat layer; and

a photosensitive layer in the mentioned order,

the undercoat layer comprises a binder resin and a strontium titanate particle,

the strontium titanate particle has a maximum peak at a position of 2θ

=32.20±

0.20 (θ

represents a Bragg angle) in a CuKα

characteristic X-ray diffraction pattern, and

a half-value width of the maximum peak is 0.10 deg or more and 0.50 deg or less.

11. An electrophotographic apparatus comprising:

a photoelectric photosensitive member;

a charging unit;

an exposing unit;

a developing unit; and

a transfer unit, wherein

the electrophotographic photosensitive member comprises;

a support;

an undercoat layer; and

a photosensitive layer in the mentioned order,

the undercoat layer comprises a binder resin and a strontium titanate particle,

the strontium titanate particle has a maximum peak at a position of 2θ

=32.20±

0.20 (θ

represents a Bragg angle) in a CuKα

characteristic X-ray diffraction pattern, and

a half-value width of the maximum peak is 0.10 deg or more and 0.50 deg or less.

12. The electrophotographic apparatus according to claim 11, comprising as the charging unit:

a charging roller disposed on the electrophotographic photosensitive member so as to be in contact with the electrophotographic photosensitive member; and

the charging roller that charges the electrophotographic photosensitive member by applying only direct-current voltage to the charging roller.