Developing member, process cartridge and electrophotographic image forming apparatus

• US 8,774,677 B2
• Filed: 05/02/2013
• Issued: 07/08/2014
• Est. Priority Date: 12/28/2011
• Status: Active Grant

• Current Assignee: Canon Ayutthaya Limited (Canon Inc.)
• Original Assignee: Canon Ayutthaya Limited (Canon Inc.)
• Inventors: Sakurai, Yuji, Yamada, Masaki, Anan, Genya
• Primary Examiner(s): Tran, Thao T.
• Application Number:
  US13/886,085
• Publication Number:
  US 20130243480A1
• Time in Patent Office: 432 Days
• Field of Search: 399/111, 399/286, 528/44, 528/85, 528/367
• US Class Current: 399/111
• CPC Class Codes: G03G 15/08 using a solid developer, e.g. powder developer
• CPC Class Codes: G03G 15/0818 characterised by the structure of the donor member, e.g. surface properties

Abstract

The present invention provides a developing member onto which a toner or the like is hard to fuse and with which toner conveying performance is unlikely to vary even through long-term usage. The developing member includes a substrate and a surface layer, the surface layer contains a polyurethane resin working as a binder resin and polyurethane resin particles dispersed in the binder resin, and the polyurethane resin working as the binder resin has, between two adjacent urethane bonds, a structure represented by a structural formula (1) and one or both of structures represented by structural formulas (2) and (3), and further has, between two adjacent urethane bonds, a structure represented by a structural formula (4).

Claims

1. A developing member comprising a substrate and a surface layer, wherein:

the surface layer comprises

a polyurethane resin as a binder resin and

polyurethane resin particles dispersed in the binder resin, and

the polyurethane resin as a binder resin has, between two adjacent urethane bonds,

a structure represented by the following structural formula (1) and

one or both of structures represented by the following structural formulas (2) and (3), and wherein;

the polyurethane resin as a binder resin further has, between two adjacent urethane bonds, a structure represented by the following structural formula (4);

2. The developing member according to claim 1, wherein the polyurethane resin particles have surfaces coated with fine silica particles.

3. An electrophotographic apparatus comprising a developing member according to claim 1.

4. A process cartridge comprising a developing member according to claim 1, wherein the process cartridge is configured to be removably attachable to a main body of an electrophotographic apparatus.