ELECTROPHOTOGRAPHIC PHOTOSENSITIVE MEMBER, PROCESS CARTRIDGE, AND ELECTROPHOTOGRAPHIC APPARATUS

• US 20200133147A1
• Filed: 10/09/2019
• Published: 04/30/2020
• Est. Priority Date: 10/25/2018
• Status: Active Grant

• Current Assignee: Canon Kabushiki Kaisha (Canon Inc.)
• Original Assignee: Canon Kabushiki Kaisha (Canon Inc.)
• Inventors: Takizawa, Kumiko, Shimada, Tsuyoshi, Ueno, Takanori, Kuroiwa, Ikuyo, Mitsuda, Haruhiko, Tanabe, Kan, Ikezue, Tatsuya
• Granted Patent: US 10,921,723 B2
• Time in Patent Office: 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 5/0542 Polyvinylalcohol, polyallylalcohol; Derivatives thereof, e.g. polyvinylesters, polyvinylethers, polyvinylamines
• CPC Class Codes: G03G 5/056 Polyesters
• CPC Class Codes: G03G 5/0564 Polycarbonates
• CPC Class Codes: G03G 5/061443 benzidine
• CPC Class Codes: G03G 5/0696 Phthalocyanines
• CPC Class Codes: G03G 5/14 Inert intermediate or cover layers for charge-receiving layers G03G5/04 takes precedence
• CPC Class Codes: G03G 5/144 comprising inorganic material

Abstract

Provided is an electrophotographic photosensitive member that can achieve both of abrasion resistance and the suppression of a ghost. The electrophotographic photosensitive member includes: a support; an undercoat layer; a charge-generating layer; and a charge-transporting layer, the undercoat layer, the charge-generating layer, and the charge-transporting layer being arranged in the stated order on the support, wherein the charge-transporting layer includes a charge-transporting substance, and a polymer containing a structure represented by the following general formula (1) and a structure represented by the following general formula (2), wherein the charge-generating layer includes a phthalocyanine crystal and a binder resin, and wherein the undercoat layer includes strontium titanate particles and a binder resin.

Claims

1. An electrophotographic photosensitive member comprising:

a support;

an undercoat layer;

a charge-generating layer; and

a charge-transporting layer,

the undercoat layer, the charge-generating layer, and the charge-transporting layer being arranged in the stated order on the support,

wherein the charge-transporting layer includes a charge-transporting substance, and a polymer containing a structure represented by the general formula (1) and a structure represented by the general formula (2),

wherein the charge-generating layer includes a phthalocyanine crystal and a binder resin, and

wherein the undercoat layer includes strontium titanate particles and a binder resin;

2. The electrophotographic photosensitive member according to claim 1, wherein the charge-transporting layer has a thickness of 30 μ

m or more.

3. The electrophotographic photosensitive member according to claim 1, wherein, in the charge-transporting layer, a content of the polymer containing the structure represented by the general formula (1) and the structure represented by the general formula (2) is 125 mass % or more and 250 mass % or less with respect to a content of the charge-transporting substance.

4. The electrophotographic photosensitive member according to claim 1, wherein the phthalocyanine crystal comprises one of a gallium phthalocyanine crystal and a titanyl phthalocyanine crystal.

5. The electrophotographic photosensitive member according to claim 1, wherein, in the undercoat layer, a content of the strontium titanate particles is 100 mass % or more and 500 mass % or less with respect to a content of the binder resin.

6. The electrophotographic photosensitive member according to claim 1, wherein the strontium titanate particles have a specific surface area of 30 m²/g or more.

7. The electrophotographic photosensitive member according to claim 6, wherein a number-average particle diameter of primary particles of the strontium titanate particles is 10 nm or more and 100 nm or less.

8. The electrophotographic photosensitive member according to claim 6, wherein the strontium titanate particles are subjected to a surface treatment with a silane coupling agent.

9. A process cartridge comprising:

the 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 process cartridge integrally supporting the electrophotographic photosensitive member and the at least one unit, and being removably mounted onto a main body of an electrophotographic apparatus,

wherein the electrophotographic photosensitive member comprises;

a support;

an undercoat layer;

a charge-generating layer; and

a charge-transporting layer,

the undercoat layer, the charge-generating layer, and the charge-transporting layer being arranged in the stated order on the support,

wherein the charge-transporting layer includes a charge-transporting substance, and a polymer containing a structure represented by the general formula (1) and a structure represented by the general formula (2),

wherein the charge-generating layer includes a phthalocyanine crystal and a binder resin, and

wherein the undercoat layer includes strontium titanate particles and a binder resin;

10. An electrophotographic apparatus comprising:

the electrophotographic photosensitive member; and

at least one unit selected from the group consisting of a charging unit, an exposing unit, a developing unit, and a transferring unit,

wherein the electrophotographic photosensitive member comprises;

a support;

an undercoat layer;

a charge-generating layer; and

a charge-transporting layer,

the undercoat layer, the charge-generating layer, and the charge-transporting layer being arranged in the stated order on the support,

wherein the charge-transporting layer includes a charge-transporting substance, and a polymer containing a structure represented by the general formula (1) and a structure represented by the general formula (2),

wherein the charge-generating layer includes a phthalocyanine crystal and a binder resin, and

wherein the undercoat layer includes strontium titanate particles and a binder resin;