Patent application number | Description | Published |
20120045250 | CHARGING MEMBER, PROCESS FOR ITS PRODUCTION, AND ELECTROPHOTOGRAPHIC APPARATUS - To provide a charging member that can not easily cause faulty cleaning. A charging member having a conductive support and an elastic layer that is a surface layer; the elastic layer having on its surface a region having been cured by irradiation with electron rays, where the region having been cured supports at least one type of spherical particles of spherical silica particles, spherical alumina particles and spherical zirconia particles in such a state that the spherical particles are exposed at least in part to the surface of the elastic layer so as to make the surface roughened. | 02-23-2012 |
20120076539 | CHARGING MEMBER - A charging member is provided which can not easily change in charging performance even because of its service over a long period of time. The charging member has a conductive support, an elastic layer and a surface layer. The elastic layer comprises spherical particles in such a way that the spherical particles are exposed at least in part to the surface of the elastic layer so as to make the surface of the elastic layer roughened; the spherical particles are at least one type selected from the group consisting of spherical silica particles, spherical alumina particles and spherical zirconia particles; the surface of the elastic layer is overlaid with the surface layer in such a way that the surface profile of the elastic layer is reflected on the surface profile of the charging member; and the surface layer comprises a high-molecular compound having a specific constituent unit. | 03-29-2012 |
20120082852 | CHARGING MEMBER AND METHOD FOR PRODUCING CHARGING MEMBER - Provided is a charging member in which the hardness of its surface is increased while surface free energy is kept low, the surface is hard to scratch even in long-term use, and a toner or the like is hard to adhere to the surface. The charging member according to the present invention includes a conductive support, a conductive elastic layer, and a surface region containing a cured material of a compound represented by the following formula (1): | 04-05-2012 |
20120141161 | CHARGING MEMBER - To provide a charging member that can not easily change in electrical resistance even by any long-term continuous application of direct-current voltage and, as a result thereof, may cause less change in its charging performance with time. The charging member has an electrically conductive support and an electrically conductive elastic layer. The elastic layer contains a vulcanized rubber. The vulcanized rubber is a vulcanized product of a mixture which contains i) a binder polymer containing a polymer having a butadiene skeleton and ii) carbon black, where the polymer having a butadiene skeleton stands modified at the molecular terminal(s) thereof with a group represented by the following formulas (1) or (2). | 06-07-2012 |
20120177408 | CHARGING MEMBER - Provided is a charging member having an elastic layer to which components derived from a developer hardly adhere even when the charging member is used for a long time period and in which elastic layer the occurrence of compression set is suppressed The charging member includes: a electroconductive support; and a electroconductive elastic layer, in which the elastic layer is formed through irradiation of an electron beam onto a surface of a rubber layer formed of a crosslinked product of a rubber mixture containing an acrylonitrile-butadiene rubber and a styrene-butadiene rubber; the styrene-butadiene rubber has a 1,2-vinyl bond, and at least one selected from a cis-1,4 bond and a trans-1,4 bond; and a ratio of the numbers of moles of the 1,4 bonds to a total number of moles of the 1,2-vinyl bond, the cis-1,4 bond, and the trans-1,4 bond is 31 mol % or more and 61 mol % or less. | 07-12-2012 |
20120224887 | CONDUCTIVE RUBBER ELASTIC MATERIAL, CHARGING MEMBER AND ELECTROPHOTOGRAPHIC APPARATUS - A conductive rubber elastic material is stably provided which can produce a charging member that may less vary in electrical resistance even with changes in applied voltage, promises uniform electrical properties, has charge characteristics not affected by changes in environments such as temperature and humidity, and enables a charging object member such as a photosensitive member to be kept from being contaminated. It is a conductive rubber elastic material which contains a matrix containing at least one ionically conductive rubber selected from the group consisting of epichlorohydrin rubber, epichlorohydrin-ethylene oxide rubber, epichlorohydrin-ethylene oxide-allyl glycidyl ether rubber, acrylonitrile-butadiene rubber and a hydrogenated product of acrylonitrile-butadiene rubber and domains composed of an electronically conductive rubber material containing i) a rubber having a butadiene skeleton and ii) carbon black, and the rubber having a butadiene skeleton is modified at a molecular terminal thereof with a specific atomic group. | 09-06-2012 |
20130039677 | CHARGING MEMBER, MANUFACTURING METHOD FOR CHARGING MEMBER, AND ELECTROPHOTOGRAPHIC APPARATUS - Provided is a charging member which hardly causes a cleaning failure in a photosensitive member while having such flexibility that a sufficient nip width can be formed with respect to a photosensitive member. The charging member comprises: an electro-conductive support; and an elastic layer as a surface layer, wherein: the elastic layer has a hardened region formed by irradiation with an electron beam; and the hardened region supports a composite particle in a state in which the composite particle is exposed on the surface of the elastic layer, thereby roughening the surface of the elastic layer, and wherein: said composite particle includes a silica-containing porous particle whose surface is coated with a carbon-containing film. | 02-14-2013 |
20130272747 | CHARGING MEMBER, PROCESS FOR ITS PRODUCTION, AND ELECTROPHOTOGRAPHIC APPARATUS - To provide a charging member that can not easily cause faulty cleaning on a photosensitive member while having a flexibility high enough to form a nip between it and the photosensitive member in a sufficient width. The charging member has an electro-conductive support and an elastic layer that is a surface layer, which elastic layer has at its surface a region having been cured by irradiation with electron rays, where this region supports spherical polyethylene particles in such a state that the spherical polyethylene particles are exposed to the surface of the elastic layer, thereby making the surface roughened. | 10-17-2013 |
20130287444 | CHARGING MEMBER, ELECTROPHOTOGRAPHIC APPARATUS, AND PROCESS CARTRIDGE - Provided is a charging member capable of stably charging an object to be charged while suppressing adhesion of toner or an external additive onto a surface of an elastic layer and compression set of an abutting portion of the elastic layer. The charging member is a charging member, comprising a mandrel; and an electro-conductive elastic layer, wherein: the elastic layer has a universal hardness decreasing from a surface toward a depth direction thereof; and the hardnesses at a central portion and both end portions in a longitudinal direction of the charging member satisfy the relationships: in the surface of the elastic layer, the hardnesses at the both end portions are higher than that at the central portion; and at a position having a depth of t (μm) from the surface of the elastic layer, the hardness at the central portion is higher than those at the both end portions. | 10-31-2013 |
20130302064 | CHARGING ROLLER AND PROCESS FOR ITS PRODUCTION - A roller for electrophotography is provided which has an electrically conductive support and an elastic layer as a surface layer, where the elastic layer holds spherical particles each having a plane on their peripheral surfaces, in such a way that part or the whole of the plane comes exposed to the surface of the elastic layer, and the plane of each of the spherical particles standing exposed to the surface of the elastic layer and a plane that is i) orthogonal to a straight line passing through an axis of a section orthogonal to an axis of the roller for electrophotography and being directed toward the peripheral surface of the roller for electrophotography and is ii) tangential to the peripheral surface of the roller for electrophotography forms an acute internal angle. | 11-14-2013 |
20130310239 | CHARGING MEMBER, PROCESS CARTRIDGE AND ELECTROPHOTOGRAPHIC APPARATUS - The present invention provides a charging member having an elastic layer on a surface thereof in which occurrence of compression set is reduced. The charging member includes an electro-conductive support and an elastic layer provided on the support as a surface layer, wherein the elastic layer is a rubber layer made of a crosslinked product of a rubber mixture including acrylonitrile butadiene rubber and polybutadiene, the polybutadiene includes 1,2-syndiotactic polybutadiene, and the elastic layer is formed by irradiating a surface of the rubber layer with electron rays. | 11-21-2013 |
20140023960 | ELECTROPHOTOGRAPHIC MEMBER, METHOD FOR PRODUCING THE SAME, PROCESS CARTRIDGE AND ELECTROPHOTOGRAPHIC APPARATUS - An electrophotographic member including an electrically conductive substrate and an electrically conductive resin layer corresponding to a surface layer. The resin layer includes electrically conductive particles and a binder resin. The binder resin is a polymer in which a polymer chain having at least one unit selected from the group consisting of units represented by the following formulas (1) and (2) and at least one unit selected from the group consisting of units represented by the following formulas (3) and (4) is crosslinked by at least one organopolysiloxane chain selected from the group consisting of structures represented by the following formulas (5) and (6): | 01-23-2014 |
20140205323 | CHARGING MEMBER AND ELECTROPHOTOGRAPHIC APPARATUS - The present invention provides a charging member which has a low compression set and which can suppress the generation of image defects. | 07-24-2014 |
20140219681 | CHARGING MEMBER, MANUFACTURING METHOD THEREFOR, AND ELECTROPHOTOGRAPHIC APPARATUS - Provided is a charging member capable of suppressing occurrence of compression set while having flexibility enough to ensure a nip with a photosensitive member. The charging member comprises a support and an elastic layer, wherein the elastic layer has an MD-1 hardness of from 55 to 85° at the surface thereof, and has a universal hardness of 2.0 to 20.0 N/mm | 08-07-2014 |