Abstract: The present invention provides a conductive rubber member which exhibits low electrical resistance, and has properties that are less affected by environmental factors, and excellent staining resistance. The conductive rubber member of the present invention has a base rubber predominantly containing epichlorohydrin rubber, and a conductive elastic layer which is formed, through hardening and molding of a rubber composition, wherein the rubber composition contains, as vulcanizing agents, a thiourea-type vulcanizing agent and a thiuram-type vulcanizing agent, and contains no elemental sulfur.

Abstract: A paper-sheet-separating/conveying roller 10 includes a rubber member (conveying member 11A or 11B) having a specific diameter and a through-hole at the center thereof; a core (protrusion 12b or 12c) inserted in the through-hole; and supports which have a diameter greater than that of the core and smaller than that of the rubber member and which sandwich the rubber member from both sides, wherein a member (fixing member 12) having the support which is in close contact with one side surface of the rubber member and a member (holding member 13) having the support which is in close contact with the other side surface of the rubber member are aligned and fixed in an axial direction.

Abstract: An object of the present invention is to provide a conductive rubber member which exhibits small environmental dependency and stable electrical resistance. The conductive rubber member is formed of a conductive elastic layer which has been imparted with conductivity by means of a conductivity-imparting agent. The conductive elastic layer has, at a surface portion thereof, a surface-treated layer which has been formed through impregnating the surface with a surface-treatment liquid containing an isocyanate component and an ion-conducting polymer.

Abstract: The conductive rubber member of the invention has a conductive elastic layer to which conductivity has been imparted and which serves as an outermost layer, and a surface-treated layer formed through impregnating a surface of the conductive elastic layer with a surface-treatment liquid containing at least an isocyanate component and an organic solvent, wherein the surface-treated layer is formed of an upper portion on the outermost side, and a lower portion beneath the upper portion, the upper portion has a density of the isocyanate component which is greater on the inner side than on the surface side within the upper portion, and the lower portion has a density of the isocyanate component that gradually decreases inwardly.

Abstract: An object of the present invention is to provide a foamed rubber member which has low hardness and excellent durability. The foamed rubber member of the invention, produced through an impregnation treatment of a foamed elastic body with a treatment liquid containing an isocyanate compound and an organic solvent, the foamed elastic body being produced by foaming a base rubber, exhibits a compression set smaller than that of the foamed elastic body before undergoing the impregnation treatment, and exhibits a percent increase in stress, with respect to the stress of the foamed elastic body before undergoing the impregnation treatment, of 50% or less.

Abstract: The present invention provides a conductive roller which has excellent resilience in response to deformation and exhibits small variation in electrical resistance. The conductive roller has a metallic core, a conductive elastic layer formed on the outer surface of the core to which layer conductivity has been imparted by carbon black, and a surface-treated layer formed through impregnating a surface of the conductive elastic layer with a surface-treatment liquid, wherein the difference ?Hs (Hs1?Hs2) between micro-hardness Hs1 of a surface of the conductive roller and micro-hardness Hs2 of the conductive elastic layer after removal of the surface-treated layer, the hardness being determined by means of a micro-hardness tester, is 5% or less of the micro-hardness Hs2.

Abstract: To provide a conductive roller which does not cause defective images with, for example, black lines, which would otherwise be caused by current leakage due to aggregation of carbon black particles or a similar phenomenon, and a method for inspecting the roller. The conductive roller having a metallic core and at least one rubber elastic layer provided on the outer peripheral surface of the core, the rubber elastic layer being formed from a conductive rubber which has ion conductivity and which contains carbon black micropowder, characterized in that said rubber elastic layer satisfies the relationship represented by the following formula: |?max/?min|?5,??[F1] wherein ?max represents the maximum value of phase difference ? as measured upon application of an AC voltage of 1.0 V within a frequency range of 100 mHz to 10 kHz, and ?min represents the minimum value of phase difference ? as measured under the same conditions.

Abstract: 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 curing product of a rubber composition having a conductivity imparting agent incorporated into a rubber base material containing chloroprene rubber; 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.

Abstract: In the elastomer porous material of the invention, when cells in a first observation region of a first cross section are observed at a certain magnification, cells having an aspect ratio a/b, wherein a represents the maximum diameter of each cell and b represents the length of the minor axis of that cell as measured in a direction orthogonal thereto, of 1.3 or less account for 70% or more of all cells in the first observation region, and, when cells in a second observation region of a second cross section orthogonal to the first cross section are observed at a certain magnification, cells having an aspect ratio a/b, wherein a represents the maximum diameter of each cell and b represents the length of the minor axis of that cell as measured in a direction orthogonal thereto, of 1.3 or less account for 70% or more of all cells in the second observation region.

Abstract: In the elastomer porous material of the invention, when cells in a first observation region of a first cross section are observed at a certain magnification, cells having a shape factor SF2, which indicates the remoteness from complete roundness and is represented by the following formula: SF ? ? 2 = P 2 4 ? ? ? ? A × 100 (wherein A represents the area of each cell, and P represents the perimeter length thereof), of 130 or less account for 80% or more of all cells in the first observation region, and, when cells in a second observation region of a second cross section orthogonal to the first cross section are observed at a certain magnification, cells having a shape factor SF2, which indicates the remoteness from complete roundness and is represented by the same formula (wherein A represents the area of each cell, and P represents the perimeter length thereof), of 130 or less account for 80% or more of all cells in the second observation region.

Abstract: The present invention provides a cleaning member which can be produced at low cost and which maintains excellent cleaning performance for a long period of time. The cleaning member has a lower layer formed through winding a double-faced tape formed of a sponge member having an adhesive layer on each side thereof around the surface of a core member, and an upper layer provided on the outer surface of the lower layer. The upper layer is formed of at least one fiber layer made of woven fabric or knitted fabric.

Abstract: In the elastomer porous material of the invention, when cells in a first observation region of a first cross section are observed at a certain magnification, cells having a shape factor SF1, which indicates the roundness of a circle and is represented by the following formula: SF ? ? 1 = ? ? ? a 2 4 ? A × 100 (wherein a represents the length of major axis of each cell, and A represents the area thereof), of 150 or less account for 80% or more of all cells in the first observation region, and, when cells in a second observation region of a second cross section orthogonal to the first cross section are observed at a certain magnification, cells having a shape factor SF1, which indicates the roundness of a circle and is represented by the same formula (wherein a represents the length of major axis of each cell, and A represents the area thereof), of 150 or less account for 80% or more of all cells in the second observation region.

Abstract: A cleaning blade member includes a cleaning layer and an elastic layer provided on the cleaning layer's back surface. Both are formed of a polyurethane member produced through curing and molding a castable polyurethane composition, the cleaning layer containing a long-chain polyol, a polyisocyanate, and a diamino compound having a melting point?80° C., the elastic layer containing a long-chain polyol, a polyisocyanate, a short-chain diol, and a short-chain triol, and has a percent edge drooping?7.0%, the cleaning and elastic layers have Young's modulus contribution factors Ra and Rb, respectively. (Rb/Ra)=0.05-6.0. Ra=[TaEa/(Ta+Tb)]. Rb=[TbEb/(Ta+Tb)]. Ea and Eb are Young's modulus of the cleaning and elastic layers, respectively. Ta and Tb represent the thicknesses of the cleaning and elastic layers, respectively, and the overall Young's modulus of the cleaning layer and elastic layer is (Ra+Rb)=5.0-14.0 MPa.

Abstract: To provide a conductive rubber member which exhibits small variation in electrical resistance and a stable electrical resistance for a long period of time. The conductive rubber member include a conductive elastic layer formed of a rubber material which has been imparted with electrical conductivity, wherein the conductive elastic layer has a surface-treatment layer which has been produced through impregnating a surface portion of the conductive elastic layer with a surface-treating liquid containing an isocyanate compound and carbon black which has undergone dispersion treatment.

Abstract: A conductive roller which can form images of consistent quality and does not cause image failures such as formation of blank spots and a method for inspecting the roller. The conductive roller having a metallic core and at least one rubber elastic layer provided on the outer peripheral surface of the core, the rubber elastic layer being formed from a conductive rubber to which conductivity has been imparted by carbon powder, wherein the conductive roller satisfies the relationship represented by formula (1): Zr/Zc?5??(1), wherein Zr (?) represents a resistance component and Zc (?) represents a capacitive reactance component, the resistance component Zr (?) and the capacitive reactance component Zc (?) being calculated respectively from impedance Z (?) and phase difference ?, when the impedance Z (?) is measured upon application of an AC voltage of 0.2 V at a frequency of 1 Hz to the rubber elastic layer.

Abstract: An object of the present invention is to provide a disk-loading roller which consistently loads and ejects a disk without a considerable decrease in conveying force, even when the roller is employed in the presence of a very large amount of dust or over a very long period of time. The disk-loading roller is for loading a disk with the roller abutting a peripheral portion of the disk, and the roller has such an outer surface that the outer diameter of the roller varies in an axial direction and is formed from a rubber molded elastic product, wherein the roller has a rough outer surface having a peak count RPc of 2 to 30 per 700 ?m, a maximum valley depth Rv of 35 to 80 ?m, and an arithmetic mean roughness Ra of 2.5 to 5.5 ?m, wherein these values are mean values as determined through measurement of the rough outer surface in a ×400 vision field.

Abstract: An object of the present invention is to provide a foamed rubber member which has low hardness and excellent durability. The foamed rubber member of the invention, produced through an impregnation treatment of a foamed elastic body with a treatment liquid containing an isocyanate compound and an organic solvent, the foamed elastic body being produced by foaming a base rubber, exhibits a compression set smaller than that of the foamed elastic body before undergoing the impregnation treatment, and exhibits a percent increase in stress, with respect to the stress of the foamed elastic body before undergoing the impregnation treatment, of 50% or less.

Abstract: The blade member is formed of a polyurethane member produced through curing and molding a castable polyurethane composition containing at least a polyol, an isocyanate compound, and a cross-linking agent. The polyurethane member exhibits a storage modulus (1 Hz) as measured at 40° C. of 2.0×107 Pa or higher and a (G?10)/(G?50) of 3 or lower, wherein represents a storage modulus (1 Hz) as measured at 10° C. (Pa) and G?50 represents a storage modulus (1 Hz) as measured at 50° C. (Pa).

Abstract: A cleaning blade member comprising a polyurethane formed by using a polyol consisting essentially of a polycarbonatediol, a polyisocyanate, and a crosslinking agent containing a short chain diol and a triol, the polyurethane having a tensile strength at 60° C. of 200 kg/cm2 or higher, and a tensile strength retention ?T, represented by the following equation, of 40% or more: ?T(%)=T60/T10×100 where T10 denotes a tensile strength at 10° C., and T60 denotes the tensile strength at 60° C.

Abstract: 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 curing product of a rubber composition having a conductivity imparting agent incorporated into a rubber base material containing 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.