CONDUCTIVE ROLLER FOR ELECTROPHOTOGRAPHIC DEVICE, CHARGING ROLLER, AND METHOD FOR MANUFACTURING CONDUCTIVE ROLLER FOR ELECTROPHOTOGRAPHIC DEVICE

摘要

PPROBLEM TO BE SOLVED: To provide a conductive rubber roller for an electrophotographic device, which has a conductive elastic layer having low hardness, is excellent compression set resistance, and is suppressed in contamination due to the bleeding from the conductive elastic layer or change in conductivity. PSOLUTION: The conductive roller for an electrophotographic device has a conductive elastic layer and a conductive functional layer on the outer circumference of a core metal. The conductive elastic layer is formed by vulcanizing a rubber composition containing, with respect to 100 parts by mass of an ethylene-propylene-diene copolymer rubber (A), 20 to 100 parts by mass of a liquid ethylene-propylene copolymer (B), 0.1 to 4 parts by mass of sulfur, and 10 to 100 parts by mass of carbon black. The copolymer (A) has an ethylene content of 60 to 73 mol%, satisfying Mw/Mn4, and has an intrinsic viscosity []of 2.7 to 5.0 dl/g in decalin at 135C and an iodine value of 10 to 40. The copolymer (B) contains no diene component and has an ethylene content of 50 to 78 mol% and the intrinsic viscosity [] of 0.2 to 0.4 dl/g in decalin at 135C. PCOPYRIGHT: (C)2010,JPO&INPIT