Electrophotographic photoreceptor, electrophotographic photoreceptor cartridge, and image forming apparatus

Patent metadata

Field	Value
Publication number	US-9454092-B2
Application number	US-201414578542-A
Country	US
Kind code	B2
Filing date	Dec 22, 2014
Priority date	Jun 20, 2012
Publication date	Sep 27, 2016
Grant date	Sep 27, 2016

Abstract

An object of the invention is to provide an electrophotographic photoreceptor in which the adhesion of the photosensitive layer is highly satisfactorily maintained regardless of the magnitude of shrinkage, and both of excellent electrical properties and excellent image characteristics are achieved. The present invention relates to an electrophotographic photoreceptor comprising: a conductive support; and, provided thereon, at least an undercoat layer and a photosensitive layer, wherein the undercoat layer comprises a binder resin and the binder resin comprises a polyamide resin which has a degree of elastic deformation of 56.0% or higher.

First claim

The invention claimed is:

1. An electrophotographic photoreceptor, comprising:
a conductive support; and, provided thereon, at least an undercoat layer and a photosensitive layer,
wherein the undercoat layer comprises a binder resin and
wherein the binder resin comprises a polyamide resin having a degree of elastic deformation, as determined on the basis of the following measuring method, of 56.0% or higher:
[Measuring method] The polyamide resin is molded into a film having a thickness of 10 μm or larger, and examined with a Vickers indenter in an atmosphere having a temperature of 25° C. and a relative humidity of 50% under the conditions of a maximum indentation load of 5 mN, a load-increasing period of 10 seconds and a load-removing period of 10 seconds to obtain a maximum indentation depth, and the value at the maximum indentation depth is taken as the degree of elastic deformation.

2. The electrophotographic photoreceptor according to claim 1 , wherein the polyamide resin comprises a polyether structure.

3. The electrophotographic photoreceptor according to claim 1 , wherein the content of the polyamide resin is 25 parts by mass or higher per 100 parts by mass of the binder resin.

4. The electrophotographic photoreceptor according to claim 1 , wherein the photosensitive layer contains a polyarylate resin.

5. An electrophotographic photoreceptor cartridge, comprising:
the electrophotographic photoreceptor according to claim 1 ; and
at least one part selected from the group consisting of a charging part for charging the electrophotographic photoreceptor, an exposure part for exposing the charged electrophotographic photoreceptor to form an electrostatic latent image, a development part for developing the electrostatic latent image formed on the electrophotographic photoreceptor, and a cleaning part for cleaning the surface of the electrophotographic photoreceptor.

6. An image forming apparatus, comprising:
the electrophotographic photoreceptor according to claim 1 ;
a charging part for charging the electrophotographic photoreceptor;
an exposure part for exposing the charged electrophotographic photoreceptor to form an electrostatic latent image;
a development part for developing the electrostatic latent image formed on the electrophotographic photoreceptor; and
a cleaning part for cleaning the surface of the electrophotographic photoreceptor.

7. An electrophotographic photoreceptor comprising:
a conductive support; and, provided thereon, at least an undercoat layer and a photosensitive layer, which have been laminated in this order from the conductive-support side,
wherein the undercoat layer comprises a polyamide resin comprising:
at least one of a linear dicarboxylic acid component and a branched dicarboxylic acid component;
at least one of a lactam component and an aminocarboxylic acid component; and
polytetramethylene ether glycol as a polyether component.

8. The electrophotographic photoreceptor according to claim 7 , wherein the polyamide resin is a block copolymerized polyamide resin comprising: a polyamide block which comprises the at least one of a linear dicarboxylic acid component and branched dicarboxylic acid component and the at least one of a lactam component and aminocarboxylic acid component; and a polyether block which comprises the polyether component.

9. The electrophotographic photoreceptor according to claim 8 , wherein the block copolymerized polyamide resin has formula [1]:
-[HS-SS] n -  [1]

HS represents a hard segment, which is a polymer unit comprising at least one kind of polyamide block that comprises at least one of a lactam component and an aminocarboxylic acid component and at least one of a linear dicarboxylic acid component and a branched dicarboxylic acid component; and
SS represents a soft segment, which is a polymer unit comprising a polyether block that comprises at least one kind of polyether component.

10. The electrophotographic photoreceptor according to claim 9 , wherein the HS and SS in the block copolymerized polyamide resin represented by formula [1] are bonded to each other by an ester bond.

11. The electrophotographic photoreceptor according to claim 8 , wherein the polyether block includes polytetramethylene ether glycol or polypropylene ether glycol.

12. The electrophotographic photoreceptor according to claim 8 , wherein the content of the polyether block in the undercoat layer is 4% by mass or higher.

13. The electrophotographic photoreceptor according to claim 8 , wherein the polyamide block is obtained by polymerizing at least one of a lactam having a single structure and an aminocarboxylic acid having a single structure.

14. The electrophotographic photoreceptor according to claim 8 , wherein the block copolymerized polyamide resin contains no dimer acid component.

15. The electrophotographic photoreceptor according to claim 8 , wherein the block copolymerized polyamide resin contains no diamine component.

16. An electrophotographic photoreceptor comprising:
a conductive support; and, provided thereon, at least an undercoat layer and a photosensitive layer, which have been laminated in this order from the conductive-support side,
wherein the undercoat layer comprises a polyamide resin comprising:
at least one of a linear dicarboxylic acid component and a branched dicarboxylic acid component;
at least one of a lactam component and an aminocarboxylic acid component; and
a polyether component, and

wherein the polyamide resin has an ester bond.

17. The electrophotographic photoreceptor according to claim 16 , wherein the polyamide resin is a block copolymerized polyamide resin comprising: a polyamide block which comprises the at least one of a linear dicarboxylic acid component and branched dicarboxylic acid component and the at least one of a lactam component and aminocarboxylic acid component; and a polyether block which comprises the polyether component.

18. The electrophotographic photoreceptor according to claim 17 , wherein the block copolymerized polyamide resin has formula [1]:
-[HS-SS] n -  [1]

wherein:
HS represents a hard segment, which is a polymer unit comprising at least one kind of polyamide block that comprises at least one of a lactam component and an aminocarboxylic acid component and at least one of a linear dicarboxylic acid component and a branched dicarboxylic acid component; and
SS represents a soft segment, which is a polymer unit comprising a polyether block that comprises at least one kind of polyether component.

19. The electrophotographic photoreceptor according to claim 18 , wherein the HS and SS in the block copolymerized polyamide resin represented by formula [1] are bonded to each other by an ester bond.

20. The electrophotographic photoreceptor according to claim 17 , wherein the polyether block includes polytetramethylene ether glycol or polypropylene ether glycol.

21. The electrophotographic photoreceptor according to claim 17 , wherein the content of the polyether block in the undercoat layer is 4% by mass or higher.

22. The electrophotographic photoreceptor according to claim 17 , wherein the polyamide block is obtained by polymerizing at least one of a lactam having a single structure and an aminocarboxylic acid having a single structure.

23. The electrophotographic photoreceptor according to claim 17 , wherein the block copolymerized polyamide resin contains no dimer acid component.

24. The el

Assignees

• Mitsubishi Chem Corp

Inventors

• Yamazaki Daisuke
• Harada Aiko
• Ida Kazutaka

Classifications

• G03G5/05

  Organic bonding materials; Methods for coating a substrate with a photoconductive layer; Inert supplements for use in photoconductive layers · CPC title

• G03G5/14 Primary

  Inert intermediate or cover layers for charge-receiving layers (for photoconductive, charge-generation or charge-transporting layers G03G5/04) · CPC title

• G03G5/142

  Inert intermediate layers · CPC title

• G03G5/061473

  plural alkenyl groups linked directly to the same aryl group · CPC title

• G03G5/06149

  enamine · CPC title