Semiconductive rubber roller

Abstract

A semiconductive rubber roller used in a printer of a photocopying machine, which is an elongated integral body consisting of a shaft of a metal, a semiconductive foamed rubber layer on and around the shaft and a semiconductive solid, i.e. non-foamed, silicone rubber layer on and around the foamed rubber layer. Unexpected improvements can be obtained in the performance and durability of the roller when the silicone rubber forming the solid silicone rubber layer contains low molecular weight organopolysiloxane molecules having a degree of polymerization not exceeding 20 in an amount not exceeding 1.0% by weight and by providing the surface of the semiconductive solid silicone rubber layer with a covering layer which may be a coating layer of a resinous coating composition or a skin layer having a modified nature by a chemical or physical treatment such as ultraviolet irradiation.

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