Patent ID: 8079943

Claim:
A development roller for an electrophotographic device, comprising: a central shaft and a roller body; wherein the roller body is composed of an elastic polymer material as a primary material, and carbon nanotubes in an amount effective to provide electrical conductivity to the roller body, wherein the carbon nanotubes are included in an amount of 0.1 phr to 1.0 phr to provide a surface resistance of 1×10 3 Ω·cm to 1×10 8 Ω·cm and a hardness of 30° to 50° as measured according to the Japanese Industrial Standard (JIS), said carbon nanotubes comprising single wall carbon nanotubes having a degree of purity of 70 vol % to 90 vol % and a length of 5 μm to 10 μm.