Developer carrying member, electrophotographic process cartridge, and electrophotographic image forming apparatus

• US 9,625,854 B2
• Filed: 05/18/2015
• Issued: 04/18/2017
• Est. Priority Date: 06/05/2014
• Status: Active Grant

• Current Assignee: Canon Ayutthaya Limited (Canon Inc.)
• Original Assignee: Canon Ayutthaya Limited (Canon Inc.)
• Inventors: Koyanagi, Takashi, Nakamura, Minoru, Tsuru, Seiji, Nagaoka, Kazuaki, Miyauchi, Yuto
• Primary Examiner(s): Tran, Thao T
• Application Number:
  US14/714,833
• Publication Number:
  US 20150355570A1
• Time in Patent Office: 701 Days
• Field of Search: 399279, 4284231, 528 44, 528 75
• CPC Class Codes: G03G 15/0818 characterised by the structure of the donor member, e.g. surface properties
• CPC Class Codes: Y10T 428/31504 Composite [nonstructural laminate]

Abstract

Provided are a developer carrying member, and a process cartridge and an electrophotographic apparatus using the developer carrying member, the developer carrying member including a substrate, an elastic layer, and a surface layer covering a surface of the elastic layer in which the surface layer contains a modified acrylic resin, and the modified acrylic resin has a constituent unit represented by the following structural formula (1).

(R1 represents an alkyl group having 1 to 3 carbon atoms; U represents a urethane resin having, between two adjacent urethane bonds, a structure represented by the following structural formula (2), and at least one of structure selected from a structure represented by the following structural formula (3) and a structure represented by the following structural formula (4); and L represents a divalent linking group containing an ester bond (—O—C(═O)—)).

Claims

1. A developer carrying member, comprising:

an electroconductive substrate;

an elastic layer on the substrate; and

a surface layer covering a surface of the elastic layer,

the surface layer containing a modified acrylic urethane resin synthesized from (i) a modified acrylic polyol containing an ester bond, (ii) an isocyanate and (iii) a polyol comprising a structure represented by formula (2), and at least one structure selected from the group consisting of formulae (3) and (4), and having a constituent unit represented by formula (1);

2. The developer carrying member according to claim 1, wherein the modified acrylic urethane resin comprises a lactone-modified acrylic urethane resin.

3. The developer carrying member according to claim 1, wherein the modified acrylic urethane resin further has a styrene structure.

4. An electrophotographic process cartridge, comprising:

a photosensitive member on which an electrostatic latent image is to be formed; and

a developing member configured to develop the electrostatic latent image on the photosensitive member, wherein

the electrophotographic process cartridge is removably mounted onto a main body of an electrophotographic image forming apparatus, and

the developing member comprises the developer carrying member of claim 1.

5. An electrophotographic image forming apparatus, comprising:

a photosensitive member on which an electrostatic latent image is to be formed; and

a developing member configured to develop the electrostatic latent image on the photosensitive member, wherein

the developing member comprises the developer carrying member of claim 1.