Canon Kabushiki Kaisha

Noriko Nagamine

Noriaki Kuroda

Yuya Tomomizu

Yoko Kuruma

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

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 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). 

The present invention provides a charging member which can maintain excellent wear resistance even though being used repeatedly. In the charging member having a surface layer, the surface layer is a surface layer constituted by at least one selected from silsesquioxanes having structures represented by a compound (1), a compound (2), a compound (3), a compound (4), a compound (5) and a compound (6), and a polysiloxane having a first unit represented by SiOR(OR)(OR), a second unit represented by SiOR(OR) and a third unit represented by SiOR, wherein the silsesquioxane is contained in the polysiloxane.

Growing community of inventors

Suntou-gun, Japan

Noriko Nagamine