JP2008152104A5 - - Google Patents

Claims (4)

In a developing roller used for contact development comprising a conductive metal core, a resin layer, and a surface layer formed on the outer periphery of the resin layer, the resin layer comprises a propylene homopolymer, a copolymer of propylene and ethylene, and propylene. Containing any thermoplastic resin selected from a copolymer of ethylene and butene and carbon black, having a flexural modulus of 2500 MPa to 3000 MPa, a thickness of 1.00 mm to 5.10 mm, The developing roller is characterized in that the surface layer contains a polyurethane resin and has a thickness of 0.10 mm to 0.50 mm . 2. The developing roller according to claim 1, wherein the resin layer has a thickness of 1.00 mm to 4.90 mm and the surface layer has a tensile elastic modulus of 50 MPa and a thickness of 0.40 mm to 0.50 mm . A developing roller for carrying a developer in contact opposite to the sensitive optical member, a developing device for forming a toner image by developing the latent image by applying a developer to the photosensitive body, the the charging member of the photosensitive member, at least one and electrophotographic process cartridge comprising integrally holding of the transfer member onto a recording medium the toner image on the cleaning member and the photosensitive body of the photosensitive body, developing electrophotographic process cartridge, wherein the roller is a developing roller according to claim 1 or 2. Comprising a sensitive light body, and a developing roller which carries the toner in contact opposite to the photosensitive member, developing roller is formed on the photosensitive member by applying toner to the photosensitive member latent image developing the electrophotographic image forming apparatus for forming a toner image, the developing roller, an electrophotographic image forming apparatus which is a developing roller according to claim 1 or 2.