Canon Kabushiki Kaisha

Wataru Moriai

Toru Ishii

Kazutoshi Ishida

Ryo Sugiyama

Tomoya Uesugi

Kenta Matsunaga

Yoshinobu Ogawa

Masashi Uno

Minoru Nakamura

Kazuaki Nagaoka

Kunimasa Kawamura

Hideya Arimura

Makoto Souma

Fumihiko Utsuno

The electrophotographic member includes: an electroconductive substrate; and a surface layer having a mono-layer structure, wherein the surface layer has a matrix containing a cross-linked urethane resin as a binder, and when an elastic modulus of the matrix in a first region in a thickness direction from an outer surface of the surface layer to a depth of 0.1 &#x3bc;m from the outer surface of the surface layer is defined as E1, and an elastic modulus of the matrix in a second region in a thickness direction from a depth of 1.0 &#x3bc;m from the outer surface of the surface layer to 1.1 &#x3bc;m from the outer surface of the surface layer is defined as E2, E1 and E2 satisfy the following Expressions (1) and (2), respectively:1&#x2265;200 MPa&#x2003;&#x2003;(1); and10 MPa&#x2264;2&#x2264;100 MPa&#x2003;&#x2003;(2).

Electrophotographic member having a surface layer with a cross-linked urethane resin-containing matrix, process cartridge, and apparatus

A developing roller that suppresses contamination of the surface of a photosensitive member and also obtains a high-quality image. The developing roller includes an electro-conductive substrate, an electro-conductive elastic layer and a surface layer which are stacked in this order, wherein the surface layer has resin particles that are dispersed in a polyurethane matrix, an outer surface of the surface layer has a first protrusion originating in first resin particle and a second protrusion originating in second resin particle, wherein the first resin particle contains polyurethane, an elastic modulus Eof the first resin particle is 100 to 2000 MPa, an elastic modulus Eof the second resin particle is 2 to 50 MPa, a maximum height roughness Rz of the outer surface is 6 to 18 &#x3bc;m, and a peak vertex density Spd is 5.0&#xd7;10to 5.0&#xd7;10(1/mm).

Developing roller, process cartridge and electrophotographic image forming apparatus

The developing member has an electroconductive substrate, and an elastic layer having a mono-layer structure on the substrate as a surface layer, wherein the elastic layer has a thickness of T &#x3bc;m and a volume resistivity of 1.0&#xd7;10&#x3a9;&#xb7;cm to 1.0&#xd7;10&#x3a9;&#xb7;cm, and includes a first resin as a main binder; and the elastic layer further includes a second resin having a structural unit represented by Formula (1), in a region extending toward a first surface from a second surface by a depth of t &#x3bc;m, where the first surface is defined as a surface of the elastic layer on a side facing the substrate, and the second surface is defined as a surface thereof opposite to the first surface, wherein in the region, a concentration of ether bonds is higher on the second surface side than on the first surface side (provided that T&#x3e;t): 

Developing member, process cartridge, and electrophotographic image forming apparatus

There is provided an electrophotographic member which suppresses scraping and contamination of a surface even in the durable use of multiple sheet printing under a high temperature environment. The electrophotographic member has an electroconductive substrate and a single elastic layer as a surface layer, the surface layer includes a binder resin and carbon black dispersed in the binder resin, the carbon black has a volatile content of 0.4% or more, the binder resin includes a crosslinked urethane resin and a crosslinked acrylic resin, and the surface layer has a first area in which the crosslinked urethane resin and the crosslinked acrylic resin form an interpenetrating polymer network structure, the first area being from an outer surface of the surface layer to a depth of 0.1 &#x3bc;m in the surface layer.

Electrophotographic member, process cartridge and electrophotographic image forming apparatus

A developing member includes a substrate, an elastic layer, and a surface layer in that order. The surface layer contains a urethane resin and a filler. The urethane resin has: the structure represented by structural formula (1) and at least one of the structures represented by structural formula (2) and structural formula (3), between two adjacent urethane linkages; and the structure represented by structural formula (4) and the structure represented by structural formula (5), between two adjacent urethane linkages. The structural formulas (1) to (5) are as follows: 

Developing member, electrophotographic process cartridge, and electrophotographic image forming apparatus

Growing community of inventors

Suntou-gun, Japan

Wataru Moriai