Sumitomo Riko Company Limited

Kenta Nakazato

Shimpei Miyagawa

Yoshihiro Saito

Takeru Horiuchi

Naoki Akira

Takenori Saito

An elastic body layer is composed of a conductive rubber composition containing an isoprene rubber, a rubber other than the isoprene rubber, and carbon black. The elastic body layer is phase-separated into a first rubber phase containing the isoprene rubber and a second rubber phase containing the rubber other than the isoprene rubber; in the range of a 5 &#x3bc;m&#xd7;5 &#x3bc;m square of an arbitrary cross section of the elastic body layer, the area ratio of the first rubber phase is within a range of 10 to 90%. The resistance value of the elastic body layer is within a range of 1.0&#xd7;10to 1.0&#xd7;10&#x3a9;. A surface layer contains an electronic conductive agent and a crosslinked body of at least one polyurethane resin of an ether polyurethane resin and a carbonate polyurethane resin, and the glass transition point of the surface layer is within a range of &#x2212;10 to &#x2212;70&#xb0; C.

Growing community of inventors

Aichi, Japan

Kenta Nakazato