Sumitomo Riko Company Limited

Satoshi Tatsumi

Kentaro Imai

Yasunori Nimura

Kadai Takeyama

Yosuke Hayashi

Shinkichi Kashihara

Satoshi Endo

Takahiro Morita

Ryosuke Yamaoka

Kengo Fujii

Kosuke Minematsu

Yutaka Kadoshima

Koji Morihara

Junichiro Suenaga

Minobu Iinuma

Kousuke Minematsu

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

Provided is a development roll for electrophotography devices in which image defects are suppressed and which achieve both maintenance of high charging properties and discharging properties. The development roll is provided with a shaft member, an elastic substance layer formed on the outer circumference of the shaft member, an intermediate layer formed on the outer circumference of the elastic substance layer, and a surface layer formed on the outer circumference of the intermediate layer. The volume resistivity of the surface layeris within the range of 1.0&#xd7;10to 1.0&#xd7;10&#x3a9;&#xb7;cm, and the volume resistivity of the intermediate layeris within the range of 1.0&#xd7;10to 1.0&#xd7;10&#x3a9;&#xb7;cm.

Development roll for electrophotography device

To provide an elastic roll for an electro-photographic apparatus that includes an elastic body layer having a low hardness and being excellent in fatigue resistance, and thus is resistant to fatigue, and to provide a method for manufacturing the same. An elastic rollfor an electrophotographic apparatus includes a shaft bodyand a foamed elastic body layerprovided on an outer periphery of the shaft bodywherein the foamed elastic body layerconsists of a silicone rubber foamed body including a plurality of air bubblesin its base material containing cross-linked silicone rubber and a reinforcement material, and wherein the foamed elastic body layer has a communication degree of 40% or more. It is preferable that the elastic rollshould further include a skin layerin the foamed elastic body layeron an outer peripheral side.

Elastic roll for electrophotographic apparatus and method for manufacturing the same

The object of the present invention is to provide a conductive roll having high resistance to permanent set and high resistance to adhesion. The conductive rollhas a rubber elastic portion formed of a rubber material including a carbon-carbon double bond and exhibiting electric conductivity. The surface of the rubber elastic portion is exposed as the surface of the roll. An organic group including one or more groups selected from silicone groups and fluorine-containing groups is bonded through an isocyanuric acid skeleton to the surface of the rubber elastic portion. The organic group may be a group derived from an organic compound including one or more groups selected from silicone groups and fluorine-containing groups and having a carbon-carbon double bond.

Conductive roll

Growing community of inventors

Aichi, Japan

Satoshi Tatsumi