Canon Kabushiki Kaisha

Hp Printing Korea Co., Ltd.

Canon Kasei Kabushiki Kaisha

Noriaki Kuroda

Hiroshi Inoue

Noriko Nagamine

Yuya Tomomizu

Yoko Kuruma

Hisao Kato

Jun Murata

Toshiro Suzuki

Masataka Kodama

Hiroki Masu

Noriko Suzumura

Takumi Furukawa

Toshinari Miura

Yukinori Nagata

Masaki Ozawa

Michitaka Kitahara

Kazuyuki Shishitsuka

Tomohito Taniguchi

Masahiro Kurachi

Noriyuki Doi

Hiroshi Mayuzumi

Seiji Tsuru

Toshihiro Otaka

Atsushi Ikeda

Taichi Sato

Shinji Doi

Hiroyuki Osada

Atsushi c/o Canon Kasei Kabushiki Kaisha Ikeda

Toshihiro c/o Canon Kasei Kabushiki Kaisha Otaka

Provided are a charging member coupleable to an electrophotographic imaging apparatus. The charging member includes an electrically-conductive support body, an electrically-conductive elastomer layer stacked on a surface of the electrically-conductive support body, and an electrically-conductive resin layer stacked as an outermost layer on the electrically-conductive elastomer layer. The electrically-conductive resin layer includes a binder resin and particles comprising at least one type of particles selected from resin particles and inorganic particles, wherein a relative dielectric constant (&#x3b5;r1) of the binder resin is greater than or about equal to a relative dielectric constant (&#x3b5;r2) of at least one type of particles.

Charging member for electrophotographic imaging apparatus

Provided is a method of producing a member for electrophotography capable of providing a high-quality electrophotographic image. The method of producing a member for electrophotography is a method of producing a member for electrophotography having an electro-conductive support, an elastic layer, and a surface layer, the method comprising: a first step of forming, on a surface of the elastic layer, a coat of a surface-layer coating liquid containing a hydrolyzed condensate of a hydrolyzable silane compound and a chelate titanium compound represented by the following general formula (2); and a second step of crosslinking the hydrolyzed condensate in the coat through cleavage of an epoxy group in the hydrolyzed condensate to form the surface layer: 

Method of producing member for electrophotography

Provided is a charging member having a rough surface, thereby suppressing adhesion of dirt on the surface. A charging member having a supporting member, an elastic layer and a surface layer, in which the surface layer contains a polymer compound, which has a Si&#x2014;O-M bond and at least one structural unit selected from structural units represented by the following general formula (1) and the following general formula (2), and has a structural unit represented by the following general formula (3); the charging member has cracks developing from the surface thereof and reaching the elastic layer; and the cracks each have convexly raised edges, by which the surface thereof is roughened.MO&#x2003;&#x2003;General formula (1) 

Charging member and method for manufacturing the same

There is provided a charging member having charging performance that is not easily changed even by long-term use. The charging member includes an electro-conductive support, an elastic layer, and a surface layer. The elastic layer contains particles in such a manner that at least a part of the particles are exposed from the elastic layer, and thus a surface of the elastic layer is roughened. The particles are high-molecular-weight polyethylene particles. The surface of the elastic layer is covered with the surface layer in such a manner that the surface shape of the elastic layer is reflected in the surface shape of the charging member. The surface layer contains a high-molecular compound having a specific constitutional unit.

Charging member and electrophotographic apparatus

Provided are a charging member capable of maintaining excellent wear resistance even after repeated use, and a process cartridge and an electrophotographic apparatus each having the charging member. The charging member is characterized in that its surface layer has a polysiloxane to which a silsesquioxane is bonded.

Charging member, process cartridge, and electrophotographic apparatus

A charging member is provided with a surface layer that can not easily wear even due to its contact with a photosensitive member and also has an appropriate elasticity contributing to the formation of an appropriate nip between it and the photosensitive member. The charging member has a substrate, an elastic layer and a surface layer; the surface layer containing a high-molecular compound having an Si&#x2014;O&#x2014;Hf linkage and having a constitutional unit represented by the formula (1) and a constitutional unit represented by the formula (2): 

Charging member, process cartridge and electrophotographic apparatus

A charging member is provided which has a surface layer that can more surely keep bleeding from occurring. It is a charging member having a substrate, an elastic layer and a surface layer; the surface layer containing a high-molecular compound having a constituent unit represented by the following formula (1) and a constituent unit represented by the following formula (2), and having an Si&#x2014;O&#x2014;Zr linkage. 

Charging member and process for its production

Provided a charging member which can prevent any contaminants deposited on a cleaning member from adhering thereto by making low a surface free energy and coefficient of friction thereof. The charging member has a substrate, an elastic layer and a surface layer, and the surface layer contains a polymer having an Si&#x2014;O&#x2014;W linkage; the polymer having a constitutional unit represented by the following formula (1) and a constitutional unit represented by the following formula (2): 

Charging member, process for its production, process cartridge and electrophotographic apparatus

Provided are the following charging member and a method of producing the charging member. The charging member has an improved charging ability and hence alleviates, in particular, a positive ghost. The charging member can maintain resistance to the adhesion of toner, a toner external additive, or the like over a long time period. The charging member for an electrophotographic apparatus comprises an electro-conductive support, an electro-conductive elastic layer, and a surface layer, wherein the surface layer comprises a polymer compound having an Si&#x2014;O&#x2014;Ti linkage in a molecular structure thereof, and the polymer compound has each of constitutional units represented by a formula (1), a formula (2), and a formula (3) defined in the description. The method is a method of producing the charging member.

Charging member and method of producing the member, process cartridge, and electrophotographic image-forming apparatus

Provided is a charging member provided with a surface layer capable of suppressing the bleeding of a low-molecular weight component from an elastic layer with improved reliability. The charging member comprises a support, an elastic layer, and a surface layer, and the surface layer contains a polymer having an Si&#x2014;O&#x2014;Ta bond and having a structural unit represented by the following structural formula (1) and a structural unit represented by the following structural formula (2). 

A charging member that achieves a high level of compatibility between the suppression of the bleeding of a low-molecular weight component from its elastic layer to its surface and charging performance for an electrophotographic photosensitive member. The charging member has a substrate, an elastic layer, and a surface layer. The surface layer contains a polymer having a Si-O-Ti bond, and the polymer has a constitutional unit represented by the following general formula (1) and a constitutional unit represented by the following general formula (2). 

To provide a charging member to the surface of which any toners and so forth can be kept from adhering and which can exhibit a stable charging performance. The charging member has a substrate, an elastic layer and a surface layer; the surface layer containing a high-molecular compound having an Si&#x2014;O&#x2014;B linkage and having a constitutional unit represented by the following formula (1) and a constitutional unit represented by the following formula (2). BO&#x2003;&#x2003;Formula (2)

Provided is a charging member capable of suppressing adhesion of toner or the like to a surface. The charging member comprises: a support; an elastic layer; and a surface layer, and the surface layer contains a polymer having an Si&#x2014;O&#x2014;Sr bond and having a structural unit represented by the following formula (1) and a structural unit represented by the following formula (2). 

A charging member is provided having a support, a conductive elastic layer formed on the support and a surface layer formed on the conductive elastic layer. The surface layer contains a polysiloxane having at least one of structures represented by the following formulas (1a1), (1a2), (1b1) and (1b2): Toners and external additives used in the toners clinging to the charging member surface can be minimized even through repeated use over a long period of time, thus the charging member can perform stable charging and image reproduction even when used in the DC contact charging method.

Growing community of inventors

Suntou-gun, Japan

Noriaki Kuroda