Sumitomo Riko Company Limited

Kengo Fujii

Takeru Horiuchi

Satoshi Endo

Kentaro Imai

Satoshi Tatsumi

Shuichi Egawa

Keiichi Ikegami

The disclosure provides a development roll for electrophotographic apparatuses. The development roll for electrophotographic apparatuses includes: a shaft; an elastic layer formed on an outer circumferential surface of the shaft; a surface layer formed on an outer circumferential surface of the elastic layer; and an end protection layer formed on an outer circumferential surface of the surface layer at both ends in an axial direction. The end protection layer contains a binder polymer and a surface modification agent that has a cyano group.

Development roll for electrophotographic apparatuses

A development roller for an electrophotographic device that can both reduce resistance and suppress bleeding-out of an ion-conducting agent is provided. A development roller for an electrophotographic deviceis provided with a shaft body, an elastic body layerformed on the outer periphery of the shaft body, and a surface layer formed on the outer periphery of the elastic body layer. The surface layerincludes the following constituents (a) to (c), and the content of constituent (b) is 3.0 to 60 parts by mass, relative to 100 parts by mass of constituent (a). Constituent (a) is a binder comprising acrylonitrile-butadiene rubber, where the content of acrylonitrile is 31 mass % or more and 36 mass % or less. Constituent (b) is an ion-conducting agent. Constituent (c) is an acrylic polymer comprising at least one selected from among a silicone group and a fluorine group.

Development roller for electrophotographic device

An electrophotography device development roller in which an increase in the electric charge of a toner is suppressed is provided. This electrophotography device development rolleris provided with a shaft, an elastic layerformed on the outer circumference of the shaft, and a surface layerformed on the outer circumference of the elastic layer. The surface layercontains components (a) to (c) below. Component (a) a binder comprising acrylonitrile-butadiene rubber having an acrylonitrile amount of 30 mass % or more; component (b) an ion-conducting agent comprising at least one selected from a phosphonium salt and a pyridinium salt; and component (c) an electric charge regulator comprising an acrylic polymer having a silicone group or fluorine-containing group and a cationic group.

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Aichi, Japan

Kengo Fujii