Patent ID: 7172544

Claim:
A conductive roller comprising at least one conductive elastic layer, said conductive elastic layer formed of a polymer composition comprising: a main-component polymer not containing chlorine nor bromine and containing polyether or/and a cyano group; a low polar ozone-resistant rubber; and an anion-containing salt having a fluoro group and a sulfonyl group added in an amount of not less than 01.01 parts by weight nor more than 20 parts by weight to 100 parts by weight of said polymer component and said rubber component; and a chemical foaming agent to foam said polymer composition, wherein said anion-containing salt having said fluoro group and said sulfonyl group includes at least one salt selected from among a salt of bisfluoroalkylsulfonylimide, and a salt of tris(fluoroalkylsulfonyl)methide, wherein said conductive foamed elastic layer has a compression set not more than 30%, when said compression set is measured at a temperature of 70Â° C. for 24 hours at a compressibility ratio of 25% in accordance with the method of testing permanent strain of vulcanized rubber and thermoplastic rubber specified in JIS K6262, and wherein said conductive foamed elastic layer has a Shore E hardness measured by a durometer of type E of not less than 20 nor more than 40 in accordance with the method of testing hardness of vulcanized rubber and thermoplastic rubber specified in JIS K6253.