Patent ID: 7897076

Claim:
A method to produce a conductive transfer roller, comprising: adding and mixing a conductive substance, an ionic conductive agent, a vulcanizing agent, and a blowing agent and at least one of an elastic material selected from a group consisting of EPMD (ethylene propylene) rubber, NBR (acrylonitrile butadiene) rubber, ECO (epichlorohydrin ethylene oxide) rubber, and CR (chloroprene rubber) to form a compound; extruding the compound; blowing the extruded compound by passing the extruded compound through a continuous moving foaming device to form a foam, the continuous moving foaming device having an internal temperature maintained in a range from approximately 200˜250° C.; pressing the foam onto a shaft and applying a secondary curing; and grinding the foam to a predetermined thickness, wherein the ionic conductive agent is selected from a group consisting of ammonium salt, perchlorate, chlorate, hydrochloride, bromate, oxy salt, fluoboric acid, sulfate, ethylsulfate, carbonate, and sulfonate and the ionic conductive agent is added to be from approximately 0.1˜0.5% by weight based on a weight of the total compound, and the conductive substance is carbon black and the conductive substance is added to be from approximately 0.5˜1.5% by weight based on a weight of the total compound.