Patent ID: 7641816

Claim:
A conductive rubber roller having a conductive rubber layer composed of a semiconductive rubber composition on an outermost layer thereof, having an oxide film formed on a surface thereof, and having a friction coefficient of said surface in a range of 0.1 to 1.5; wherein said semiconductive rubber composition contains a rubber component of copolymerized rubber containing ethylene oxide; chloroprene rubber; and acrylonitrile-butadiene rubber; wherein the copolymerized rubber containing ethylene oxide, the chloroprene rubber, and the acrylonitrile-butadiene rubber are dispersed finely; wherein a mixing amount of said copolymerized rubber containing ethylene oxide is smaller than that of said acrylonitrile-butadiene rubber; and a mixing amount of said chloroprene rubber is smaller than that of said acrylonitrile-butadiene rubber; wherein said mixing amount of said copolymerized rubber containing ethylene oxide is not less than 5 parts by mass for 100 parts by mass of the rubber component, said mixing amount of said acrylonitrile-butadiene rubber is not less than 10 parts by mass and not more than 65 parts by mass for 100 parts by mass of the rubber component, and said mixing amount of said chloroprene rubber is not less than 5 parts by mass and not more than 75 parts by mass for 100 parts by mass of the rubber component; and wherein a compression set is not less than 1% nor more than 10%; a hardness measured in accordance with JIS A is not less than 50 degrees nor more than 63 degrees; and a maximum elongation is not less than 260%; wherein the acrylonitrile-butadiene rubber is low-nitrile acrylonitrile-butadiene rubber containing acrylonitrile at not more than 25%.