| CANON KASEI KABUSHIKI KAISHA Patent applications |
| Patent application number | Title | Published |
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| 20120008992 | PROCESS FOR PRODUCING CONDUCTIVE RUBBER ROLLER, AND ROLLER FOR ELECTROPHOTOGRAPHIC APPARATUS - This invention provides a process for producing a conductive rubber roller having small aspect ratios of inner and outer diameters, having a stable measure of its inner diameter, having uniform cell distribution and being free from non-uniformity of hardness and electrical resistance in the peripheral direction. The process has a step of continuously extruding a tube composed of a specific unvulcanized rubber composition from a rubber extruder in a microwave vulcanizing unit, and a step of foaming and vulcanizing the tube by using a microwave irradiator having a microwave irradiation zone 4 m or less in length while being transported at given speed. The foamed rubber tube has an inner diameter 20 to 35% smaller than the outer diameter of the conductive core material over the whole region in the lengthwise direction, and the conductive core material is press-fitted into the foamed rubber tube without using any adhesive. | 01-12-2012 |
| 20110243624 | BLADE FOR ELECTROPHOTOGRAPHIC APPARATUS, AND PROCESS FOR MANUFACTURING THE SAME - To provide a blade for electrophotographic apparatus that can have much superior durability as being made low frictional at its touching part and also improved in bonding force between the touching part and the blade member, a blade for electrophotographic apparatus is provided which has a blade member having a touching part which is to come into touch with an object member, and a support member which holds the blade member; the touching part being formed of a material which is different from that for the blade member; the touching part having a touching face having a coefficient of static friction which is smaller than that of a surface of the blade member; and the touching part having a joint surface at which the touching part is joined with the blade member which joint surface has a center line average roughness Ra of from 0.5 μm to 10.0 μm. | 10-06-2011 |
| 20110233813 | METHOD AND APPARATUS FOR PRODUCING AN ELECTROPHOTOGRAPHIC BLADE MEMBER - A method of producing an electrophotographic blade member includes a continuous molding groove in an peripheral surface and an endless belt, in which the blade member includes a polyurethane resin cured a polyurethane composition having a viscosity of 500-3,000 mPa·s and including A)-D), and a position at which the composition is injected is set, on the belt, opposing to the groove, the position being away from a portion at which the molding drum and the belt are first contacted on an upstream for a moving direction of the belt: A) polyisocyanate; B) adipate-based polyester polyol having a number average molecular weight of 1,000-4,000; C) chain extender having a molecular weight of 200 or less; D) isocyanurate-forming catalyst at 20 to 500 ppm and a urethane-forming catalyst at 200-1,500 ppm. | 09-29-2011 |
| 20110194880 | TRANSFER ROLLER - A transfer roller is provide that less cause faulty image which is used in electrophotographic process such as copiers and laser-beam printers, in particular, used on the inner side of an intermediate transfer belt of a full-color image forming apparatus. It is a transfer roller which has a shaft and provided on the periphery thereof at least two conductive foamed rubber layers; the layers having an outermost layer which has a foamed rubber mean cell size of from 10 μm or more to less than 100 μm and an inner layer which has a foamed rubber mean cell size of from 100 μm or more to 500 μm or less; and, as measured in an environment of 23° C./55% RH, the roller having a resistance Rx of from 5.6 or more to 7.0 or less in Log Rx and the inner layer having a resistance Ry of from 5.0 or more to 7.0 or less in Log Ry. | 08-11-2011 |
| 20110000067 | METHOD FOR MANUFACTURING ELECTROPHOTOGRAPHIC ELASTIC ROLLER - A method for manufacturing a low-cost electrophotographic elastic roller having a good dimensional precision is provided. In that method, in which both end parts of a shaft core body are gripped and fixed in a vertical direction, an inclination of a central axis is corrected, a circular coating head including a circular slit is used so that the shaft core body is moved in the direction, and a elastic layer material is ejected from the slit to be coated on the shaft core body, the method includes: a maximum deflection coordinate in a longitudinal direction of the shaft core body is detected with a central axis of the shaft core body as a base point coordinate before coating; a central position of the head is moved at constant from the base point to the maximum during coating, and the position is moved to the base point after the head has reached the maximum. | 01-06-2011 |
| 20090290921 | CLEANING BLADE FOR ELECTROPHOTOGRAPHIC APPARATUS - There is provided a cleaning blade for an electrophotographic apparatus having good cleaning performance both immediately after long-time shutdown under low temperature environment and during continuous use under low temperature environment even when spherical toner having a small diameter is used. A cleaning blade for an electrophotographic apparatus having an elastic blade member which is brought into contact with an image bearing member and frictionally slid to remove remaining toner, wherein the elastic blade member satisfies (1) to (4): (1) the stress-relaxation rate represented by the formula (a) at 10° C. is 25% or less; | 11-26-2009 |
| 20090182065 | PROCESS FOR PRODUCING CONDUCTIVE RUBBER ROLLER, AND ROLLER FOR ELECTROPHOTOGRAPHIC APPARATUS - This invention provides a process for producing a conductive rubber roller having small aspect ratios of inner and outer diameters, having a stable measure of its inner diameter, having uniform cell distribution and being free from non-uniformity of hardness and electrical resistance in the peripheral direction. The process has a step of continuously extruding a tube composed of a specific unvulcanized rubber composition from a rubber extruder in a microwave vulcanizing unit, and a step of foaming and vulcanizing the tube by using a microwave irradiator having a microwave irradiation zone 4 m or less in length while being transported at given speed. The foamed rubber tube has an inner diameter 20 to 35% smaller than the outer diameter of the conductive core material over the whole region in the lengthwise direction, and the conductive core material is press-fitted into the foamed rubber tube without using any adhesive. | 07-16-2009 |
| 20090162109 | CONDUCTIVE RUBBER ROLLER AND TRANSFER ROLLER - A conductive rubber roller and transfer roller whose resistance value is easily controlled and which lowers contamination of a charged member and has excellent electric variability and compressive permanent set is provided at low cost. There is provided a conductive rubber roller for use in an electrophotographic process, wherein a rubber component of the conductive rubber roller has at least acrylonitrile butadiene rubber whose acrylonitrile content is 15% by mass to 25% by mass (both inclusive) and weight average molecular weight (Mw) is 500,000 to 1,000,000 (both inclusive), and epichlorohydrin type rubber whose ethylene oxide content is not less than 70% by mole to less than 90% by mole; and the acrylonitrile butadiene rubber is contained in an amount of 5 parts by mass to 80 parts by mass (both inclusive) in 100 parts by mass of the rubber component. | 06-25-2009 |
| 20090060597 | COPOLYMER, RESIN FOR ELECTROPHOTOGRAPHIC FUNCTIONAL COMPONENT PARTS, DEVELOPING ROLLER, AND ELECTROPHOTOGRAPHIC APPARATUS - A copolymer obtained by copolymerizing at least one monomer selected from specific acrylate or methacrylate monomers, at least one monomer selected from specific amino group-containing monomers and at least one monomer selected from specific polar group-containing monomers. A resin for electrophotographic functional component parts, which contains this copolymer, a developing roller in which a cover layer serving as a surface layer contains the copolymer as a positive charge control resin, and an electrophotographic apparatus that includes the developing roller. | 03-05-2009 |
| 20090041519 | ELECTROPHOTOGRAPHIC CLEANING BLADE, PROCESS FOR PRODUCING ELECTROPHOTOGRAPHIC CLEANING BLADE, AND ELECTROPHOTOGRAPHIC APPARATUS - An electrophotographic cleaning blade is provided which is free of blade turning-up coming from both end portions of the blade in its lengthwise direction. The cleaning blade having a blade formed of a polyurethane resin, which is to come into touch with the surface of a photosensitive drum of an electrophotographic apparatus to remove a toner remaining thereon, and a support member which holds the blade. The blade has a polyurethane resin portion having a dynamic hardness of 0.05 mN/μm | 02-12-2009 |
| 20090022530 | BLADE FOR ELECTROPHOTOGRAPHIC APPARATUS, AND METHOD OF PRODUCING THE SAME - A blade for an electrophotographic apparatus is provided which is prevented from turning up, achieves wear resistance, and has excellent cleaning properties. The blade is composed of a support member and a blade member formed of a thermosetting polyurethane elastomer, which are joined together. The blade member has a structure in which a nitrogen concentration continuously increases from the inside of a contact part coming into contact with a counterpart member toward the surface of the contact part. | 01-22-2009 |
| 20090014912 | METHOD FOR MANUFACTURING MOLD AND BLADE FOR ELECTROPHOTOGRAPHIC APPARATUS, AND DEVELOPER AMOUNT CONTROLLING BLADE - A mold for use in producing a molded body of an elastomer has a holding layer and a releasing layer on an inner periphery surface of a main body of a die. The releasing layer is formed of an addition two-component liquid silicone having a polysilazane-based or polysiloxane-based chain as a main chain, contains 0.5 mass % or less of a component which volatilizes at a curing temperature of a liquid elastomer raw material, does not contain silica, has International Rubber Hardness Degree of 50 to 85 degrees, and contains a solid lubricant having an average particle size of 2 to 20 μm. The present invention also provides a method for manufacturing a blade for an electrophotographic apparatus by using the mold and a developer amount controlling blade having specific load length ratio and ten-point average roughness in which a blade member is manufactured with the method. | 01-15-2009 |
| 20080310887 | TONER SUPPLYING ROLLER AND METHOD FOR MANUFACTURING THE SAME - A toner supplying roller is provided in which a polyurethane foam layer can be obtained without decreasing the reactivity of the polyurethane material, and in which contamination by a catalyst remaining in the polyurethane foam layer is suppressed, so that a good image can be obtained. Moreover, the toner supplying roller has suitable aperture cells in the surface, suitably performs the scraping off of the development residual toner and toner supply between the toner supplying roller and the developing roller, and forms a uniform toner thin film on the developing roller, so that a good image can be obtained. In a toner supplying roller including a polyurethane foam layer that is formed on the mandrel periphery using a polyurethane material including a polyol and a polyisocyanate, the polyol and the polyisocyanate have an amine number of 3 mg KOH/g or more and 15 mg KOH/g or less in total. | 12-18-2008 |
| 20080260440 | CLEANING BLADE - A cleaning blade is provided which does not cause contamination of other parts even when being stored for a long period of time in a high temperature and high humidity environment. The cleaning blade is set in an image forming apparatus employing an electrostatic transfer process, including a blade member and a support member to rub and remove residual toner remaining on a photosensitive drum provided to the image forming apparatus, in which the total amount of nitrogen-containing compounds extracted with methanol from the cleaning blade is 12 μg or less per cm of the cleaning blade in its longitudinal direction. | 10-23-2008 |
| 20080247791 | DEVELOPER LEVEL CONTROL BLADE AND PROCESS FOR MANUFACTURING DEVELOPER LEVEL CONTROL - A developer level control blade is provided which can form a developer layer on a developer carrying member in a proper thickness and in a uniform state and can keep the developer, in particular, color toner particles from melt-adhering to the charge control face so that faulty images such as lines and non-uniformity can be kept from occurring. Also provided is a process for manufacturing this developer level control blade. The process for manufacturing the developer level control blade is characterized by having the steps of extruding a blade member material melted to liquefy, covering therewith a support member thin-plate metal member at an edge portion thereof to join the both together, and cooling the blade member material to solidify, followed by cutting in a preset length. | 10-09-2008 |
| 20080247787 | Positive Charge Control Resin for Electrophotographic Functional Component Parts, Developing Roller, and Electrophotographic Apparatus - To provide a positive charge control resin with which an electrophotographic functional component part coming into contact with a toner can be made chargeable in a polarity reverse to the polarity of the toner, and which has superior dispersibility in, and compatibility with, a main binder. The present invention is a positive charge control resin having a copolymer obtained by polymerizing specific acrylate or methacrylate monomer, amino-group-containing monomer(s) and carboxyl-group-containing monomer(s) as copolymerization components. | 10-09-2008 |
| 20080213421 | Centrifugal casting die, method for manufacturing thereof as well as casting material, blade obtained therefrom and method for manufacturing thereof - A centrifugal casting die according to the present invention includes a cylindrical die body, a backup layer releasably bonded to the inner surface | 09-04-2008 |
