Developing roller, process cartridge, and electrophotographic apparatus

• US 8,600,273 B2
• Filed: 04/03/2012
• Issued: 12/03/2013
• Est. Priority Date: 12/28/2010
• Status: Active Grant

• Current Assignee: Canon Kabushiki Kaisha (Canon Inc.)
• Original Assignee: Canon Kabushiki Kaisha (Canon Inc.)
• Inventors: Yamada, Masaki, Kusaba, Takashi, Kawamura, Kunimasa, Sakurai, Yuji, Ishii, Toru
• Primary Examiner(s): Chen, Sophia S
• Application Number:
  US13/438,580
• Publication Number:
  US 20120195631A1
• Time in Patent Office: 609 Days
• Field of Search: 399/286, 399/279, 399/265, 492/18, 492/49, 492/53, 492/56, 298/95
• US Class Current: 399/286
• CPC Class Codes: G03G 15/0818 characterised by the structure of the donor member, e.g. surface properties
• CPC Class Codes: Y10T 29/49544 Roller making

Abstract

A developing roller including a mandrel, an elastic layer provided on the mandrel and containing a cured material of an addition curable-type dimethyl silicone rubber, and a surface layer containing a urethane resin that covers the circumferential surface of the elastic layer. The urethane resin has a structure represented by the following formula (1), and one or both structures selected from a structure represented by the following formula (2) and a structure represented by the following formula (3) between two adjacent urethane linkages.

Claims

1. A developing roller comprising a mandrel, an elastic layer, and a surface layer that covers a surface of the elastic layer, wherein

the elastic layer comprises a cured material of an addition curable-type dimethyl silicone rubber,

the surface layer comprises a urethane resin, and

the urethane resin has, between two adjacent urethane linkage, a structure represented by the following formula (1), and at least one selected from the group consisting of a structure represented by the following formula (2) and a structure represented by the following formula (3):

2. The developing roller according to claim 1, wherein a water absorption rate of the elastic layer measured according to Japanese Industrial Standard (JIS) K7209 Method A, is not less than 0.02% and not more than 0.10%.

3. An electrophotographic apparatus comprising the developing roller according to claim 1, and an electrophotographic photosensitive member disposed abutting on the developing roller.

4. A process cartridge comprising the developing roller according to claim 1, and an electrophotographic photosensitive member disposed abutting on the developing roller, and detachably attached to a main body of an electrophotographic apparatus.