Abstract: There has been a problem, in rollers to be incorporated in image forming apparatus utilizing the technology of electrophotography, that an elastic roller which comprises at least one elastic layer formed around an electrically conductive shaft and at least one covering layer formed on the outer surface of the elastic layer undergoes interfacial peeling possibly occurring when the roller rotates while contacting with other members.

Abstract: Disclosed is an elastic roller for electrophotography wherein bleeding of an unreacted material, a plasticizer and an additive from the elastic layer to the roller surface is suppressed. Also disclosed is an elastic roller for electrophotography having excellent durability for long use. Specifically disclosed is (1) an elastic roller for electrophotography comprising a metal supporting member, an elastic layer formed on the outer circumferential surface of the metal supporting member, and a coating film which is formed on the elastic layer using a styrene-based thermoplastic elastomer and/or an olefin-based thermoplastic elastomer and composed of at least one or more layers.

Abstract: An electrophotography roller incorporated in an image creating device by the electrophotography comprising a conductive shaft disposed along the center axis, a conductive elastic layer around the shaft, a surface layer on the conductive elastic layer formed concentrically. The JIS A hardness of the conductive elastic layer is 30° or less. The shear modulus of the conductive elastic layer measured in viscoelasticity under the condition of 20° C., 60% PH and 0.1 Hz is 4 105 Pa or more. The width of contact of the roller with another member is sufficiently ensured even under a low pressing pressure. The compression residual strain is small even after the roller is pressed against another member for a long time. If the roller is used as a development roller, a sharp image with less density unevenness due to the residual strain is created.

Abstract: A curable composition which comprises as essential ingredients (A) an organic polymer having per molecule at least one alkenyl group capable of undergoing hydrosilylation, (B) a compound having at least two hydrosilyl groups per molecule, (C) a hydrosilylation catalyst, (D) carbon black, (E) at least one compound selected from the group consisting of epoxidized compounds, acid anhydride compounds, and ester compounds, and (F) an organotitanium compound and/or an organoaluminum compound. In the composition, the carbon black serving as a conductivity imparter has been surface-treated with the ingredients (E) and (F) by the integral blending method. The conductive material obtained by heat-curing the curable composition has regulated conductivity.

Abstract: An electrophotography roller incorporated in an image creating device by the electrophotography comprising a conductive shaft disposed along the center axis, a conductive elastic layer around the shaft, a surface layer on the conductive elastic layer formed concentrically. The JIS A hardness of the conductive elastic layer is 30° or less. The shear modulus of the conductive elastic layer measured in viscoelasticity under the condition of 20° C., 60% PH and 0.1 Hz is 4 105 Pa or more. The width of contact of the roller with another member is sufficiently ensured even under a low pressing pressure. The compression residual strain is small even after the roller is pressed against another member for a long time. If the roller is used as a development roller, a sharp image with less density unevenness due to the residual strain is created.