Sumitomo Riko Company Limited

Junichiro Suenaga

Yasunori Nimura

Takeru Horiuchi

Shinkichi Kashihara

Satoshi Tatsumi

Takahiro Morita

Ryosuke Yamaoka

Akitoshi Morita

Kousuke Minematsu

Provided is a charging roll for electrophotographic equipment with which any increase in resistance and any bleeding of ionic electroconductive agent while energization persists can be minimized. A charging rollfor electrophotographic equipment, the charging rollcomprising a shaft bodyand an elastic layerthat is formed on the outer peripheral surface of the shaft body, the elastic layerbeing a crosslinked article of a rubber composition containing the following components (a) to (e). (a) One or more selected from hydrin rubber and nitrile rubber, (b) a crosslinking agent, (c) an ionic electroconductive agent, (d) one or more selected from piperidinyloxy radical compounds and phenolic antioxidants, and (e) one or more selected from salts of cyclic amidine compounds and thiophthalimide compounds.

Charging roll for electrophotographic equipment

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

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Komaki, Japan

Junichiro Suenaga