SEMICONDUCTIVE ROLLER AND TONER CONVEYING ROLLER

摘要

PROBLEM TO BE SOLVED: To provide a semiconductive roller and a toner conveying roller capable of improving picture quality of an initial image and forming an image with sufficient image density, having excellent durability while hardly changing the above performance, and suppressing degradation of a toner and decrease in a charge amount accompanying the degradation of the toner, and thereby, preventing occurrence of fog or the like before the toner is completely used.

SOLUTION: A roller body 2 of a semiconductive roller 1 is formed of a rubber composition comprising a base polymer, which is a mixture of a mixture nitrile rubber N of a liquid nitrile rubber and a solid nitrile rubber, a chloroprene rubber C and an epichlorohydrin rubber E, in a mass ratio (C+E)/N ranging from 10/90 to 80/20, with 5 mass% or more of the proportion of the chloroprene rubber C and 5 mass% or more of the proportion of the epichlorohydrin rubber E. The roller body 2 has a Shore A hardness of 60 or lower, and the semiconductive roller 1 has a roller resistance of 104to 109Ω at an application voltage of 5 V.

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