Patent ID: 8900107

Claim:
A conductive rubber member comprising a conductive elastic layer formed of a rubber material that has been imparted with electrical conductivity, the conductive elastic layer having a surface-treatment layer comprising carbon black and an isocyanate compound that has been produced through impregnating a surface portion of the conductive elastic layer with a surface-treating liquid, the liquid comprising: the isocyanate compound, and pre-treated carbon black that has undergone dispersion pre-treatment with a polymer dispersant, prior to being included in the surface-treating liquid, wherein the density of conductive paths in the conductive elastic layer is higher at the surface of the conductive elastic layer than an interior, thus forming a resistance gradient in the conductive elastic layer, and wherein the carbon black has undergone dispersion pre-treatment only with the polymer dispersant, and the polymer dispersant comprises a polyethylene glycol-polypropylene glycol monomethacrylate.