Conductive roll
AssigneeTokai Rubber Industries, Ltd.
InventorsMasahiko Itoh, Wataru Imamura, Tetsuya Itoh
Life of this patent
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Abstract
A conductive roll sequentially has a conductive layer of an elastic material, a resistance adjusting layer, and a protective layer which are formed on an outer periphery of a shaft. The resistance adjusting layer is formed from a composition containing 10 to 150 parts by weight of an electron conductive agent, not more than two parts by weight of an ion conductive agent and 20 to 80 parts by weight of an insulating filler, relative to 100 parts by weight of nitrile rubber, or nitrile rubber hydride as a base material. The roll has a properly controlled environment dependence of its electric resistance, and avoids any trouble, such as enlarged picture defects, when employed in an electrophotographic process.
Claims20
A conductive roll sequentially comprising a conductive layer of an elastic material, a resistance adjusting layer, and a protective layer which are formed on an outer periphery of a shaft, said resistance adjusting layer being formed from a composition containing 10 to 150 parts by weight of an electron conductive agent, not more than two parts by weight of an ion conductive agent and 20 to 80 parts by weight of an insulating filler, relative to 100 parts by weight of nitrile rubber, or nitrile rubber hydride as a base material.
Dependencies are inferred from the claim text.