| POWDERTECH CO., LTD. Patent applications |
| Patent application number | Title | Published |
|---|
| 20120076551 | RESIN-COATED CARRIER FOR ELECTROPHOTOGRAPHIC DEVELOPER AND PROCESS FOR PRODUCING THE SAME, AND ELECTROPHOTOGRAPHIC DEVELOPER COMPRISING THE RESIN-COATED CARRIER - An object of the present invention is to provide a resin-coated ferrite carrier comprising a carrier core material having a small particle size, a high sphericity and surface uniformity, and a low standard deviation, a process for producing the carrier, and an electrophotographic developer comprising the resin-coated ferrite carrier and having a high image quality and excellent durability. For achieving the above object, there is provided a resin-coated carrier for an electrophotographic developer characterized by comprising spherical ferrite particles having an average particle size of 20 to 50 μm, a surface uniformity of 90% or more, an average sphericity of 1 to 1.3 and a sphericity standard deviation of 0.15 or less, a process for producing the carrier, and an electrophotographic developer comprising the resin-coated carrier. | 03-29-2012 |
| 20120003579 | FERRITE CARRIER CORE MATERIAL AND FERRITE CARRIER FOR ELECTROPHOTOGRAPHIC DEVELOPER, AND ELECTROPHOTOGRAPHIC DEVELOPER USING THE FERRITE CARRIER - There are provided a ferrite carrier core material for an electrophotographic developer, which contain 10 to 30% by weight of Mn, 1.0 to 3.0% by weight of Mg, 0.3 to 1.5% by weight of Ti and 40 to 60% by weight of Fe, a ferrite carrier for an electrophotographic developer obtained by coating the ferrite core material, and an electrophotographic developer using the ferrite carrier. | 01-05-2012 |
| 20110244389 | FERRITE CARRIER CORE MATERIAL FOR ELECTROPHOTOGRAPHIC DEVELOPER, FERRITE CARRIER FOR ELECTROPHOTOGRAPHIC DEVELOPER AND METHODS FOR PRODUCING THE FERRITE CARRIER CORE MATERIAL AND THE FERRITE CARRIER, AND ELECTROPHOTOGRAPHIC DEVELOPER USING THE FERRITE CARRIER - Disclosed are a ferrite carrier core material for an electrophotographic developer including a ferrite particle having an apparent density of 2.30 to 2.80 g/cm | 10-06-2011 |
| 20110244388 | RESIN-COATED CARRIER FOR ELECTROPHOTOGRAPHIC DEVELOPER, AND ELECTROPHOTOGRAPHIC DEVELOPER USING THE RESIN-COATED CARRIER - There is provided a resin-coated carrier for an electrophotographic developer, including: a carrier core particle; and a coating resin layer comprising a silicone resin or a modified silicone resin formed on a surface of the carrier core particle, wherein a titanium-ethyl acetoacetate chelate or a titanium-octylene glycol chelate is contained in the coating resin layer as a titanium chelate, and wherein the content of the titanium-ethyl acetoacetate chelate or the titanium-octylene glycol chelate is 5.0 to 50.0% by weight based on coating resin solids. There is also provided an electrophotographic developer using the resin-coated carrier. | 10-06-2011 |
| 20110212399 | FERRITE CORE MATERIAL AND FERRITE CARRIER FOR ELECTROPHOTOGRAPHIC DEVELOPER, AND ELECTROPHOTOGRAPHIC DEVELOPER USING THE FERRITE CARRIER - There is provided a ferrite core material for an electrophotographic developer, the ferrite core material having a ferrite particle composition represented by the formula (1) shown below, containing SrO replacing a part of (MnO) and/or (MgO) in the formula (1) shown below, and having a Cl concentration of 0.1 to 100 ppm, as measured by an elution method of the ferrite core material: | 09-01-2011 |
| 20110195357 | RESIN-FILLED FERRITE CARRIER CORE MATERIAL FOR ELECTROPHOTOGRAPHIC DEVELOPER, FERRITE CARRIER AND ELECTROPHOTOGRAPHIC DEVELOPER USING THE FERRITE CARRIER - Disclosed are a resin-filled ferrite carrier core material for an electrophotographic developer, including a porous ferrite particle, wherein the composition of the porous ferrite particle is represented by the following formula (1), and part of (MgO) and/or (Fe | 08-11-2011 |
| 20110183253 | CORE MATERIAL OF FERRITE CARRIER AND FERRITE CARRIER FOR ELECTROPHOTOGRAPHIC DEVELOPER, AND ELECTROPHOTOGRAPHIC DEVELOPER USING THE FERRITE CARRIER - A core material of a ferrite carrier for an electrophotographic developer, the core material being composed of a ferrite particle containing at least one or more temperature compensation-type dielectric components selected from Mg | 07-28-2011 |
| 20110129772 | POROUS FERRITE CORE MATERIAL FOR ELECTROPHOTOGRAPHIC DEVELOPER, RESIN-FILLED FERRITE CARRIER AND ELECTROPHOTOGRAPHIC DEVELOPER USING THE FERRITE CARRIER - A porous ferrite core material for an electrophotographic developer, the porous ferrite core material including Mg in a content of 0.3 to 3% by weight, Ti in a content of 0.4 to 3% by weight and Fe in a content of 60 to 70% by weight, and the porous ferrite core material having a pore volume of 0.04 to 0.16 ml/g, a peak pore size of 0.4 to 1.6 μm, a saturation magnetization of 40 to 80 Am | 06-02-2011 |
| 20110097811 | OXYGEN DETECTOR AND METHOD FOR MANUFACTURING OXYGEN DETECTOR - It is an object of the present invention to provide: an oxygen indicator aqueous solution for an oxygen detector that has high heat resistance, can be stored at room temperature, and can maintain an excellent ability to detect oxygen, regardless of the atmospheric temperature; an oxygen detector; and a method for manufacturing an oxygen detector. | 04-28-2011 |
| 20110013948 | CORE MATERIAL OF CARRIER FOR ELECTROPHOTOGRAPHIC DEVELOPER AND METHOD FOR MANUFACTURING THE CORE MATERIAL, CARRIER AND METHOD FOR MANUFACTURING THE CARRIER, AND ELECTROPHOTOGRAPHIC DEVELOPER USING THE CARRIER - Objects of the present invention are to provide a carrier core material for an electrophotographic developer having a true spherical shape and excellent strength, and a controllable true density and/or apparent density, and a method for manufacturing the carrier core material, a carrier and a method for manufacturing the carrier, and an electrophotographic developer using the carrier. In order to achieve the objects, there are employed a carrier core material for an electrophotographic developer, containing 3 to 100% by number of hollow particles having an iron content of 36 to 78% by weight, and a carrier for an electrophotographic developer, obtained by coating a resin on a surface of the carrier core material, and methods for manufacturing these, and an electrophotographic developer using the carrier. | 01-20-2011 |
| 20100248125 | RESIN-FILLED FERRITE CARRIER FOR ELECTROPHOTOGRAPHIC DEVELOPER AND ELECTROPHOTOGRAPHIC DEVELOPER USING THE FERRITE CARRIER - A resin-filled ferrite carrier for an electrophotographic developer obtained by filling voids of a porous ferrite core material with a resin, wherein the resin is a silicone resin having a phenyl group, and an electrophotographic developer using this ferrite carrier. | 09-30-2010 |
| 20100248113 | CARRIER COATED WITH RESIN FOR ELECTROPHOTOGRAPHIC DEVELOPER AND ELECTROPHOTOGRAPHIC DEVELOPER USING THE CARRIER COATED WITH RESIN - A carrier coated with a resin for an electrophotographic developer in which a carrier particle surface is coated with the resin and the coating resin contains a lithium salt, and an electrophotographic developer using the carrier coated with the resin. | 09-30-2010 |
| 20100233612 | CARRIER FOR TWO-COMPONENT ELECTROPHOTOGRAPHIC DEVELOPER AND ELECTROPHOTOGRAPHIC DEVELOPER USING THE CARRIER - A carrier for an electrophotographic developer in which a surface of a carrier core particle is coated with a silicone resin or a modified silicone resin, the coated resin containing a dioctyltin compound, and the silicon content and dioctyltin content in the coating resin satisfy the following expression, and an electrophtographic developer using the carrier. | 09-16-2010 |
| 20100196818 | CARRIER CORE MATERIAL AND CARRIER FOR ELECTROPHOTOGRAPHIC DEVELOPER AND PROCESS FOR PRODUCING THE SAME, AND ELECTROPHOTOGRAPHIC DEVELOPER USING THE CARRIER - Employment of a carrier core material for an electrophotographic developer containing 0.8 to 5% by weight of Mg, 0.1 to 1.5% by weight of Ti, 60 to 70% by weight of Fe and 0.2 to 2.5% by weight of Sr and having an amount of Sr dissolved with a pH4 standard solution of 80 to 1000 ppm, a carrier using the core material and a process for producing them, and an electrophotographic developer using the carrier. | 08-05-2010 |
| 20100111816 | INORGANIC PARTICLE-CONTAINING EMULSION AND MANUFACTURING METHOD OF A PARTICLE BY USING THE INORGANIC PARTICLE-CONTAINING EMULSION - The invention aims at providing an inorganic particle-containing emulsion which enables further size reduction of particles and can bring about a mono-disperse system and an enhanced yield and a manufacturing method of a particle by the use of the emulsion. This aim can be performed by a water in oil emulsion prepared by mixing an oil phase liquid and an water phase liquid which contains inorganic particles under agitation, in which the water phase liquid contains inorganic particle having a specific gravity of 1.5 to 11 g/cm | 05-06-2010 |
| 20100055601 | RESIN-FILLED CARRIER FOR ELECTROPHOTOGRAPHIC DEVELOPER AND ELECTROPHOTOGRAPHIC DEVELOPER USING THE RESIN-FILLED CARRIER - A resin-filled carrier for an electrophotographic developer which carrier is obtained by filling a resin in the voids of a porous ferrite core material, wherein the Cl concentration of the porous ferrite core material, measured by an elution method, is 10 to 280 ppm and the resin contains an amine compound, and an electrophotographic developer using the resin-filled carrier. | 03-04-2010 |
| 20090297974 | CARRIER FOR AN ELECTROPHOTOGRAPHIC DEVELOPER, AND ELECTROPHOTOGRAPHIC DEVELOPER USING THE CARRIER - A carrier for an electrophotographic developer, in which a carrier core material surface is coated with a mixed resin of a fluorine resin selected from a tetrafluoroethylene-hexafluoropropylene copolymer or a tetrafluoroethylene-perfluoroalkyl vinyl ether copolymer, and a polyamide imide resin, wherein the mixed resin includes a surfactant and a charge control agent, and the mixed resin has a perfluorooctanoic acid content of 100 ppm or less and an electrophotographic developer using this carrier. | 12-03-2009 |
| 20090263739 | RESIN-FILLED CARRIER FOR ELECTROPHOTOGRAPHIC DEVELOPER, AND ELECTROPHOTOGRAPHIC DEVELOPER USING THE RESIN-FILLED CARRIER - A resin-filled carrier for an electrophotographic developer obtained by filling resin into voids of a porous ferrite core material, wherein the porous ferrite core material has a pore volume of 0.04 to 0.16 mL/g and a peak pore size of 0.9 to 2.0 μm, and an electrophotographic developer using this resin-filled carrier. | 10-22-2009 |
| 20090246677 | CARRIER CORE MATERIAL FOR AN ELECTROPHOTOGRAPHIC DEVELOPER, CARRIER, AND ELECTROPHOTOGRAPHIC DEVELOPER USING THE CARRIER - A carrier core material for an electrophotographic developer containing Li ferrite, maghemite, and Fe | 10-01-2009 |
| 20090246676 | CARRIER CORE MATERIAL FOR ELECTROPHOTOGRAPHIC DEVELOPER, CARRIER, AND ELECTROPHOTOGRAPHIC DEVELOPER USING THE CARRIER - A carrier core material for an electrophotographic developer including Li ferrite, maghemite, and Fe | 10-01-2009 |
| 20090246670 | CARRIER PARTICLES FOR FORMING WIRING CIRCUIT PATTERN AND DEVELOPER - Carrier particles for forming a wiring circuit pattern by an electrophotographic developing method which are used for directly forming a circuit shape on an insulating layer, with any of a metal powder, an inorganic compound powder, or a mixed raw material powder thereof used as a toner powder for forming a circuit, the toner powder for forming a circuit being adhered to a surface of the carrier particles by electrostatic force and then transported to a surface of the insulating layer, wherein the carrier particles include a resin coated layer of an acrylic resin composition containing an amino-group-containing polymer on the surface of the carrier core material particles, the coating amount of the acrylic resin composition is 0.3 to 3.0% by weight based on a carrier core material weight of 100% by weight, and a shape factor SF-1 of the carrier core material particles is 100 to 110. | 10-01-2009 |
| 20090246526 | FERRITE PARTICLES AND PRODUCTION METHOD THEREOF - A method for producing ferrite particles by weighing, mixing, then crushing ferrite raw materials, and granulating the resultant slurry, and then sintering the resultant granulated material using a rotary furnace, wherein the sintering is carried out under a positive pressure reducing atmosphere. | 10-01-2009 |
| 20090239173 | RESIN-FILLED CARRIER FOR ELECTROPHOTOGRAPHIC DEVELOPER, AND ELECTROPHOTOGRAPHIC DEVELOPER USING THE RESIN-FILLED CARRIER - A resin-filled carrier for an electrophotographic developer obtained by filling resin into voids of a porous ferrite core material, wherein the porous ferrite core material has a pore volume of 0.04 to 0.16 mL/g and a peak pore size of 0.9 to 2.0 μm, and wherein microparticles are included in the resin to be filled, and an electrophotographic developer using this resin-filled carrier. | 09-24-2009 |
| 20090223432 | Oxygen detector sheet and oxygen detecting agent using the same , and method for manufacturing oxygen detector sheet - The oxygen detecting device ( | 09-10-2009 |
| 20090197194 | CARRIER CORE MATERIAL FOR ELECTROPHOTOGRAPHIC DEVELOPER, CARRIER AND ELECTROPHOTOGRAPHIC DEVELOPER USING THE CARRIER - There are adopted: a carrier core material for an electrophotographic developer, including Mg, Ti and Fe as main components, and containing Fe, Mg and Ti in contents of 52 to 66% by weight, 3 to 12% by weight and 0.2 to 12% by weight, respectively; an electrophotographic developer carrier prepared by coating with a resin the surface of the carrier core material; and an electrophotographic developer using the carrier. | 08-06-2009 |
| 20090176170 | RESIN-FILLED CARRIER FOR ELECTROPHOTOGRAPHIC DEVELOPER, AND ELECTROPHOTOGRAPHIC DEVELOPER USING THE RESIN-FILLED CARRIER - A resin-filled carrier for an electrophotographic developer obtained by filling resin into voids of a porous ferrite core material, wherein the porous ferrite core material has a pore volume of 0.055 to 0.16 mL/g and a peak pore size of 0.20 to 0.7 μm, and an electrophotographic developer using this resin-filled carrier. | 07-09-2009 |
| 20090170022 | ELECTROPHOTOGRAPHIC DEVELOPER CARRIER AND ELECTROPHOTOGRAPHIC DEVELOPER USING THE SAME CARRIER - There are adopted: an electrophotographic developer carrier that includes on the surface of a carrier core material a coating resin including a silicone resin containing a fluorine silane coupling agent, has an intensity ratio (F/Si), measured with fluorescent X-ray, between the fluorine atom and the silicon atom present on the carrier surface of 1.4×10 | 07-02-2009 |
| 20090130587 | RESIN-COATED FERRITE CARRIER FOR ELECTROPHOTOGRAPHIC DEVELOPER, ITS PRODUCTION METHOD, AND ELECTROPHOTOGRAPHIC DEVELOPER USING THE RESIN-COATED FERRITE CARRIER - A spherical resin-coated ferrite carrier for an electrophotographic developer which can maintain a stable resistance and chargeability, a favorable charge rising property because of an excellent fluidity, and has a suitable durability, its production method which is excellent in economic efficiency and production stability, and an electrophotographic developer using the resin-coated ferrite carrier, are provided. A resin-coated ferrite carrier for an electrophotographic developer which is a spherical resin-coated ferrite carrier, wherein a carrier core material thereof has an irregular surface to improve the adhesive strength to a resin coat, and wherein the irregularity of the surface takes a finely streaked wrinkle pattern, its production method, and an electrophotographic developer using the resin-coated ferrite carrier, are employed. | 05-21-2009 |
| 20080241729 | RESIN-COATED FERRITE CARRIER FOR ELECTROPHOTOGRAPHIC DEVELOPER AND ELECTROPHOTOGRAPHIC DEVELOPER USING THE RESIN-COATED FERRITE CARRIER - Employed are a resin-coated ferrite carrier for an electrophotographic developer including a ferrite carrier core material having a BET specific surface area of 900 to 5,000 cm | 10-02-2008 |
| 20080241726 | RESIN-FILLED FERRITE CARRIER FOR ELECTROPHOTOGRAPHIC DEVELOPER, PRODUCTION METHOD THEREOF AND ELECTROPHOTOGRAPHIC DEVELOPER USING THE FERRITE CARRIER - Employed are a resin-filled ferrite carrier for an electrophotographic developer filled with a resin in voids of a porous ferrite core material, wherein the resin filled in the voids is a silicone resin which has a softening point of 40° C. or above and is cured at or above such softening point, and the filled amount is 7 to 30 parts by weight based on 100 parts by weight of the core material, a method for producing thereof band an electrophotographic developer using this ferrite carrier. | 10-02-2008 |
| 20080238450 | METHOD FOR INSPECTING QUALITY OF CORE MATERIAL FOR ELECTROPHOTOGRAPHIC FERRITE CARRIER - An object of the present invention is to provide a quality inspection method for obtaining a specifying factor which can more reliably indicate powder characteristics of a core material for an electrophotographic ferrite carrier. To achieve the object, a method for inspecting the quality of a core material for an electrophotographic ferrite carrier adopts a method characterized in that the impedance of the core material for the electrophotographic ferrite carrier is measured by using an AC-resistance measurement method to obtain a Nyquist diagram (Cole-Cole plot) in which a real number impedance (Z′) is arranged in an X-axis and an imaginary number impedance (Z″) is arranged in a Y-axis and then the characteristics of the particles of the core material for the electrophotographic ferrite carrier is evaluated by using the Nyquist diagram (Cole-Cole plot). Here, the quality of a core material for the electrophotographic ferrite carrier is judged according to a predetermined equivalent circuit by using the value of the parameters one or two or more in combination selected from |Rs|, Rp | 10-02-2008 |
| 20080206664 | METHOD FOR PRODUCING CORE MATERIAL OF ELECTROPHOTOGRAPHIC FERRITE CARRIER AND RESIN-COATED FERRITE CARRIER - The present invention provides a method for producing a core material of an electrophotographic ferrite carrier, by charging a raw powder with an average particle size of 20 to 50 μm obtained by preparing raw materials for ferrite into a combustion flame along with a carrier gas for the raw powder, thermal-spraying the powder in atmospheric air to ferritize the powder, subsequently rapidly solidifying the thermal-sprayed particle, and sampling and collecting the particle, wherein the method satisfies the conditions comprising the following (1) to (3): (1) a mixture gas of propane and oxygen is used for the combustion flame for the thermal spraying, and a volumetric ratio of the propane to the oxygen is 1:3.5 to 6.0; (2) the carrier gas for the raw powder is air, nitrogen, oxygen or a mixture gas thereof, and the ratio (a/b) of a charged amount (a) of a raw powder (kg/hr) to a charged amount (b) of the carrier gas (kg/hr)for the raw powder is 4.8 or less; and (3) a flame flow velocity of the combustion flame is 65 to 125 m/sec. | 08-28-2008 |
| 20080199800 | RESIN-FILLED FERRITE CARRIER FOR ELECTROPHOTOGRAPHIC DEVELOPER AND ELECTROPHOTOGRAPHIC DEVELOPER USING THE FERRITE CARRIER - A resin-filled ferrite carrier for an electrophotographic developer filled with a silicone resin in voids of a porous ferrite core material which continuously extend from a surface to a core interior, wherein the resin-filled ferrite carrier has an average particle size of 20 to 50 μm, and (Si/Fe)×100 as determined from X-ray fluorescence elemental analysis is 2.0 to 7.0, and the particle size and (Si/Fe)×100 are correlated, and wherein in the correlation relationship between [(Si/Fe)×100] and the particle size, a gradient (a) in a correlation equation thereof is −0.50≦a≦0.15. | 08-21-2008 |
