Developer support member, electrophotographic process cartridge and electrophotographic image forming apparatus
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United States of America Patent
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Jul 1, 2014
Grant Date -
Jan 31, 2013
app pub date -
Oct 5, 2012
filing date -
Jul 15, 2011
priority date (Note) -
In Force
status (Latency Note)
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Abstract
A developing roller which is excellent in image quality and image durability and stably outputs a uniform image, and a process cartridge and an electrophotographic apparatus using the developing roller are provided. The developing roller has a mandrel, an elastic layer and a surface layer covering the elastic layer surface, wherein the surface layer contains a urethane resin having at least one structure of the followings A) and B) between two adjacent urethane linkages: A) a structure represented by the following structural formula (1), and at least one structure selected from the group consisting of structures represented by the following structural formulae (2) and (3), and B) a structure represented by the following structural formula (4), and the surface layer contains polyurethane resin particles of which the elastic part of the indentation work based on ISO 14577-1 is 80% or more, is obtained:
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