Electroconductive rubber roller
AssigneeSumitomo Rubber Industries, Ltd.
InventorYoshihisa Mizumoto
Life of this patent
Estimating the term…
Abstract
An electroconductive rubber roller (10) whose outermost layer consists of a rubber layer (1) made of a rubber composition containing an ionic-conductive rubber as a main component thereof. The surface of the rubber layer consists of an oxide film; and the rubber composition contains a dielectric loss tangent-adjusting filler to set a dielectric loss tangent of the electroconductive rubber roller to 0.1 to 1.5. Weak electroconductive carbon black and/or calcium carbonate treated with fatty acid can be used as the dielectric loss tangent-adjusting filler.
Claims17
An electroconductive rubber roller having an outermost rubber layer made of a rubber composition containing an ionic-conductive rubber as a main component thereof,
- wherein the surface of said outermost rubber layer comprises an oxide film formed by oxidation of the outermost rubber layer by irradiating with ultraviolet rays and/or ozone;
- and said rubber composition contains a dielectric loss tangent-adjusting filler to set a dielectric loss tangent of said electroconductive rubber roller to 0.1 to 1.5.
An electroconductive rubber roller which is used as a development roller used for single-component toner and having an outermost rubber layer made of a rubber composition containing an ionic-conductive rubber as a main component thereof,
- wherein said rubber layer has a thickness of 0.5 mm to 10 mm and a surface of said outermost rubber layer comprises an oxide film formed by oxidation of the outermost rubber;
- and said rubber composition contains a dielectric loss tangent-adjusting filler to set a dielectric loss tangent of said electroconductive rubber roller to 0.1 to 1.5.
Dependencies are inferred from the claim text.