Abstract: A semiconductive rubber roller comprising a toner-transporting portion whose outermost layer is formed essentially of vulcanized rubber containing 0.1 to 30 parts by mass of a phthalocyanine compound for 100 parts by mass of the vulcanized rubber. An electric resistance value of the semiconductive rubber roller which is measured at a temperature of 23° C. and a humidity of 55% is in a range of 103 to 109?, when a voltage of 100V is applied thereto.

Abstract: A conductive roller comprising a toner-transporting portion, made of a vulcanized rubber composition, which is disposed at least on an outermost layer thereof. The vulcanized rubber composition contains a rubber component (A) mixed with a weakly conductive carbon black (B) having a large particle diameter not less than 80 nm nor more than 500 nm, a highly conductive carbon black (C) having a small particle diameter not less than 18 nm nor more than 80 nm, and an inorganic filler (D) consisting of not less than one kind of a metal oxide selected from among a group of titanium oxide, alumina, and silica. The total of a mixing amount of the weakly conductive carbon black (B), that of the highly conductive carbon black (C), and that of the inorganic filler (D) for 100 parts by mass of the rubber component (A) is not less than 15 parts by mass nor more than 60 parts by mass.

Abstract: A semiconductive rubber roller comprising a toner-transporting portion whose outermost layer is formed essentially of vulcanized rubber containing 0.1 to 30 parts by mass of a phthalocyanine compound for 100 parts by mass of the vulcanized rubber. An electric resistance value of the semiconductive rubber roller which is measured at a temperature of 23° C. and a humidity of 55% is in a range of 103 to 109?, when a voltage of 100V is applied thereto.

Abstract: A semiconductive roller comprising a toner-transporting portion whose outermost layer is formed essentially of resin or rubber, wherein the resin or the rubber includes resin or rubber having chlorine atoms and 3 to 60 parts by mass of titanium oxide for 100 parts by mass of the resin or the rubber having the chlorine atoms.

Abstract: An elastic roller contains EPDM rubber as a main component and has a friction coefficient of not less than 2 with respect to ordinary paper and a hardness of not more than 35.degree..The amount of softening agent added to EPDM rubber which is a main component is not more than 150 parts by weight per 100 parts by weight of rubber.

Abstract: An electrically conductive rubber roller for electrophotography which does not exhibit touch memory or bleed out of remnant siloxanes, even after 18 days of storage without use, and, in a preferred form, exhibits little change in electric resistance with changes in environment. This roller is made by making a rubber molding material composition containing a raw polysiloxane rubber which does not contain more than 5,000 ppm of low molecular weight polysiloxanes, cyclic siloxanes and non-functional silicone oils (remnant siloxanes); molding this composition into a roller; at least primarily crosslinking the rubber in the roller; and then subjecting the crosslinked rubber roller to heating under a vacuum.

Abstract: An apparatus feed paper sheets to a photosensitive dram of an electronic copier, negatively charged toner adhering the dram. The apparatus incorporates a paper feed roller and a rubber member located adjacent the roller for supporting paper sheets in contacting relation to the roller. The robber member has a polymer, vulcanizer, vulcanization aid and filler; and at least one component selected from the group consisting of magnesium oxide, barium oxide, nylon short fibers, powder of nylon short fibers and nigrosine compound. The component is present in an amount of 1 to 100 parts by weight to 100 parts by weight of the polymer. The paper sheet becomes electrostatically charged negatively, when contacting the rubber member during sheet feeding by the roller, thus preventing electrostatic attraction between the paper approaching the dram and negatively charged toner on the dram.

Abstract: There is disclosed an electrically conductive rubber roller for electrophotography which changes very little in electric resistance with changes in environment. This roller is used for charging and image transferring processes in copying machines and laser beam printers. The roller comprises a porous body of crosslinking silicone composition, containing at least a silica type filler, carbon black a foaming agent and siloxane polymer; the composition has an electric resistance of 10.sup.3 -10.sup.8.