Developing member, process cartridge and electrophotographic image forming apparatus

• US 9,846,407 B2
• Filed: 10/11/2016
• Issued: 12/19/2017
• Est. Priority Date: 10/23/2015
• Status: Active Grant

• Current Assignee: Adare Pharmaceuticals, Inc.
• Original Assignee: Canon Kabushiki Kaisha (Canon Inc.)
• Inventors: Nakamura, Minoru, Nagaoka, Kazuaki, Miyauchi, Yuto
• Primary Examiner(s): NGO, HOANG X
• Application Number:
  US15/290,012
• Publication Number:
  US 20170115595A1
• Time in Patent Office: 434 Days
• CPC Class Codes: G03G 15/0818 characterised by the structure of the donor member, e.g. surface properties
• 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

Abstract

A high-quality developing member having compatibility between high toner charging properties and high durability under high temperature and high humidity environments is provided. The developing member includes an electro-conductive substrate and an electro-conductive surface layer in this order. The surface layer includes a binder resin, an alumina particle and a polyester phosphate compound.

Claims

1. A developing member comprising an electro-conductive substrate and an electro-conductive surface layer in this order,

the surface layer comprising a binder resin, an alumina particle and a polyester phosphate compound having a structure represented by Formula 1:

2. The developing member according to claim 1, wherein an electro-conductive elastic layer is interposed between the substrate and the surface layer.

3. The developing member according to claim 1, wherein an atomic concentration of aluminum (Al %) of the outermost surface of the surface layer satisfies 1.50≦

Al≦

10.0.

4. The developing member according to claim 1, wherein an atomic concentration of phosphorus (P %) of the outermost surface of the surface layer satisfies 0.05≦

P≦

2.50.

5. The developing member according to claim 1, wherein

R1 is selected from the group consisting of a substituent having a poly(ε

-caprolactone) structure, a substituent having a poly(δ

-valerolactone) structure, and a substituent having a copolymer structure of ε

-caprolactone and δ

-valerolactone; and

R2 and R3 are each independently selected from the group consisting of a hydrogen atom, an alkyl group having 1 to 8 carbon atoms, polyethylene oxide, a substituent having a poly(ε

-caprolactone) structure, a substituent having a poly(δ

-valerolactone) structure, and a substituent having a copolymer structure of ε

-caprolactone and δ

-valerolactone.

6. The developing member according to claim 1, wherein the polyester phosphate compound has a number average molecular weight of 1000 to 50000.

7. The developing member according to claim 1, wherein the surface layer has a thickness of 0.005 to 0.1 mm.

8. A process cartridge configured to be detachably attachable to a main body of an electrophotographic apparatus, the process cartridge comprising a developing apparatus,

the developing apparatus comprising a developing member,

the developing member comprising an electro-conductive substrate and an electro-conductive surface layer in this order, and

the surface layer comprising a binder resin, an alumina particle and a polyester phosphate compound having a structure represented by Formula 1:

9. n electrophotographic image forming apparatus comprising an image bearing member bearing an electrostatic latent image, a charging apparatus charging the image bearing member, an exposure apparatus forming an electrostatic latent image on the charged image bearing member, a developing apparatus developing the electrostatic latent image with a toner to form a toner image, and a transfer apparatus transferring the toner image onto a transfer material,

the developing apparatus comprising a developing member,

the developing member comprising an electro-conductive substrate and an electro-conductive surface layer in this order, and

the surface layer comprising a binder resin, an alumina particle and a polyester phosphate compound having a structure represented by Formula 1: