| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an electroconductive rubber roller which is not accompanied by problems such as deterioration of electrical conductivity and rise of hardness and has uniform electrical properties, low hardness and excellent compression set properties. <P>SOLUTION: The electroconductive rubber roller is constituted of an electroconductive metal core and an electroconductive crosslinked rubber layer including an epichlorohydrin-based rubber stacked on the electroconductive metal core, wherein the epichlorohydrin-based rubber is at least one copolymer selected from the group consisting of an epichlorohydrin-ethylene oxide copolymer and an epichlorohydrin-ethylene oxide-allyl glycidyl ether ternary copolymer. The ethylene oxide constitutional unit in the epichlorohydrin-based rubber is in a content of 40-90 mol%, and, the electroconductive crosslinked rubber layer has a heat quantity (enthalpy: ΔH) of ≤5 mJ/mg as measured by a differential scanning calorimetry (DSC) and indicated by a peak appearing within a range of -20 to 150°C. <P>COPYRIGHT: (C)2007,JPO&INPIT |
