Patent ID: 8211000

Claim:
A conductive roller comprising a core and a conductive foam formed on a peripheral surface thereof, wherein said conductive foam consists of a three-phase rubber composition containing 35 to 50 parts by mass of epichlorohydrin rubber, 25 to 35 parts by mass of ethylene-propylene-diene copolymer rubber, and 25 to 30 parts by mass of acrylonitrile-butadiene rubber as a rubber component thereof; and said conductive foam does not have a coating layer formed on a surface thereof; and said conductive roller has an Asker C hardness, an electric resistance value, an average surface-cell diameter, and a number of surface cells set to 30 to 36°, 10 6 to 10 7 Ω, 100 to 200 μm, and 50 to 120/1.5 mm square respectively.