Developer support member, electrophotographic process cartridge and electrophotographic image forming apparatus
First Claim
1. A developing roller comprising a mandrel, an elastic layer and a surface layer covering the surface of the elastic layer, whereinthe surface layer contains a urethane resin which has 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 a structure represented by the following structural formula (2) and a structure represented by the following structural formula (3), andB) a structure represented by the following structural formula (4),and whereinthe surface layer contains polyurethane resin particles of which the elastic part of the indentation work based on ISO 14577-1 is 80% or more;
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Accused Products
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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Citations
4 Claims
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1. A developing roller comprising a mandrel, an elastic layer and a surface layer covering the surface of the elastic layer, wherein
the surface layer contains a urethane resin which has 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 a structure represented by the following structural formula (2) and a structure represented by the following structural formula (3), and B) a structure represented by the following structural formula (4), and wherein 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; - View Dependent Claims (2, 3, 4)
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Specification