Conductive rubber member

1. A conductive rubber member having at least one conductive elastic layer, wherein

the conductive elastic layer, which is at least an outermost layer, in contact with an opposing member during use is a cured product of a rubber composition having a conductivity imparting agent incorporated into a rubber base material consisting of acrylonitrile-butadiene rubber (NBR), and

a superficial portion of the conductive elastic layer is a surface treatment layer formed by impregnating the conductive elastic layer with a surface treating solution containing at least an isocyanate component and an organic solvent.

2. The conductive rubber member according to claim 1 , wherein the surface treating solution further contains at least one of carbon black and at least one polymer selected from an acrylic fluoropolymer and an acrylic silicone polymer.

3. The conductive rubber member according to claim 1 , wherein the surface treating solution further contains a polyether-based polymer.

4. The conductive rubber member according to claim 3 , wherein the polyether-based polymer has active hydrogen.

5. The conductive rubber member according to claim 4 , wherein the polyether-based polymer is epichlorohydrin rubber.

6. The conductive rubber member according to claim 1 , wherein the conductivity imparting agent is at least one of an electronic conductivity imparting agent and an ionic conductivity imparting agent.

7. The conductive rubber member according to claim 1 , which is roll-shaped or blade-shaped.