Abstract: A method for manufacturing a toner is provided. The method for manufacturing a toner uses a rotary stirring apparatus that includes a circulating section for repeatedly performing circulation in a powder passage having a rotary stirring chamber and a circulation tube to return to the rotary stirring chamber by a rotary stirring section having a rotary disc around which rotary blades are installed and a rotary shaft, and a temperature adjusting section provided at least on a part of the powder passage for adjusting temperatures in the powder passage and of the rotary stirring section to a predetermined temperature, and includes a temperature adjusting step; a fine resin particle adhering step; a spraying step; and a film-forming step. The temperature in the powder passage is adjusted to the predetermined temperature by the temperature adjusting section at the fine resin particle adhering step, the spraying step, and the film-forming step.

Abstract: There is provided a toner having good charging characteristics that is composed of a core region and a thin shell in which a charge control agent is densely distributed so as to improve charging characteristics of the toner, and a method for manufacturing the same. The method for manufacturing a toner having a bi-layered structure includes: producing a toner core using a suspension polymerization method; preparing a suspension of toner particles having a core-shell structure by forming a rigid shell on a surface of the toner core; and recovering the toner particles from the suspension as a post-processing operation.

Abstract: There is provided a method for producing a carrier, which includes depositing a resin coating layer on the surface of a magnetic material; adding a treatment agent for a conductor precursor to the resin coating layer so as to treat the resin coating layer with the treatment agent; and exposing the treatment agent-added resin coating layer to a conductor precursor in a supercritical or subcritical fluid so as to form a conductor in the resin coating layer.

Abstract: A toner includes a core containing a binder resin, wax, and a colorant, and an external additive layer coating the core, wherein the core is prepared such that it is extruded and extended to have a fiber phase, and is pulverized. The toner has an improved fixing ability to allow an electrostatic image to be fixed at a low temperature while having an excellent durability and an improved storage stability, while exhibiting reduced toner blocking and offset phenomena.

Abstract: 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.

Abstract: A resin-coated ferrite carrier having a uniform resin coating and emitting no offensive odors, etc., its production method, and an electrophotographic developer which comprises the resin-coated ferrite carrier, is excellent in the charge stability and image quality stability over a long period, causes less fogging of image or carrier adhesion, is favorable in the image density and environmental dependency, and can fully respond to high-speed and full-color imaging, are provided. The resin-coated ferrite carrier for the electrophotographic developer is characterized in that the surface of ferrite particles is coated with a mixed resin of a tetrafluoroethylene-hexafluoropropylene copolymer or a tetrafluoroethylene-perfluoroalkylvinyl ether copolymer and a polyamideimide resin, and that the mixed resin contains a silicon oxide.

Abstract: The method of making nano-sized particles for use in making emulsion aggregation toner particles, the nano-sized particles having a core portion and a shell portion, wherein the core portion of the nano-sized particles includes crystalline resin and the shell portion includes amorphous resin and is substantially to completely free of the crystalline resin.

Abstract: A hybrid toner includes micro cylinders, cores inserted into the micro cylinders, and an external addition layer covering the micro cylinders to which the cores are inserted. The hybrid toner prevents a toner blocking phenomenon, image contamination, and low storage stability which occur due to dispersion of wax and colorants to an outer surface of the toner.

Abstract: A magnetic toner is provided having at last a binder resin and a magnetic material and having a weight-average particle diameter of 3 ?m to 10 ?m. The magnetic material has been surface-treated with a low-softening substance (A), and has a compressibility of 35 or more which can be calculated according to a specific expression. The softening point of the magnetic toner is from 40° C. to 85° C. in measurement by a flow tester. The magnetic toner has a resin component containing 1% to 60% by weight of a tetrahydrofuran-insoluble matter. This magnetic toner is superior in low-temperature fixing performance and has good fixing performance in a broad fixing range.

Abstract: A carrier comprised of a core and a polymer generated from a mixture of two latexes, and wherein the first latex enables a polymer with a high molecular weight, and the second latex enables a polymer with a low molecular weight, and wherein high represents a weight average molecular weight of from about 1,000,000 to about 8,000,000, and said low represents a weight average molecular weight of from about 500,000 to about 750,000.

Abstract: To provide a method for producing a carrier including treating a coating layer on a surface of a core material with a polymer precursor in a supercritical fluid and/or a subcritical fluid so as to add the polymer precursor to the coating layer, and subjecting the coating layer to oxidation treatment so as to form a polymer from the polymer precursor in the coating layer, and a carrier produced by the method.

Abstract: Coated carrier particles are provided for use in developer compositions for electrophotographic imaging. The coated carrier particles include a carrier core and a resin coating that includes first and second polymer components. The coated carrier particles exhibit stable triboelectric charging during aging, decreased coating hardness, higher coating coverage, and an improved resilience to toner impaction.

Abstract: A mixture containing a binder resin and a colorant is mixed with an aqueous medium, the resulting mixture liquid is mechanically sheared to finely granulate the mixture, fine particles are formed as cores, and a coating resin layer is formed on core surfaces, to obtain toner particles.

Abstract: A toner excellent in temporal stability is provided which toner is capable of maintaining good cleaning property stably for a long period of time and whose surface is provided with a coating layer having an effect of preventing toner aggregation. There are also provided a method of manufacturing the toner, a two-component developer, a developing apparatus, and an image forming apparatus. The toner has a core particle containing a binder resin and a colorant and a coating layer which contains fine resin particles and are formed on surfaces of the core particles. The coating layers are formed by partially fusing the fine resin particles to at least either the core particle or adjacent fine resin particles.

Abstract: A carrier containing a core, a polymer coating, mixtures of polymers, or a plurality of polymers thereover, and wherein at least one of, and more specifically, one of the coating polymers, includes graphite.

Abstract: The present invention provides a method for producing a carrier that includes dissolving at least a coating material in carbon dioxide in a liquid state, and forming a coating layer on a core material surface by reducing the solubility of the liquid with at least the coating material dissolved therein through control of at least any one of the pressure and temperature. The present invention also provides a carrier produced by the method for producing a carrier.

Abstract: A method including polymerization performed with the use of a binder resin dispersion containing a styrene monomer, a compound having one or more unsaturated bond and sulfonic acid or sulfonate, and an acrylic ester monomer, wherein the contents of the monomers and the compound are 60 to 90 mol %, 1 mol ppm to 10 mol %, and 10 to 40 mol %, respectively.

Abstract: Carrier comprised of a core, a polymer coating, and wherein said coating contains a mixture of an alkali metal lauryl sulfate and a conductive component.

Abstract: A ferrite carrier for an electrophotographic developer having a compression breaking strength of 150 MPa or more, a rate of compressive change of 15.0% or more and a shape factor SF-1 of 100 to 125, a method for producing the same, and an electrophotographic developer containing the ferrite carrier.

Abstract: There are adopted an electrophotographic resin-coated ferrite carrier having a carrier core coated with a resin, wherein a product of an apparent density ? (g/cm3), average particle size d (?m) and BET specific surface area S (m2/g) of the carrier core satisfies the following condition, a method for producing the same, and an electrophotographic developer. 4.5??×d×S?8.

Abstract: Carrier comprised of a mixture of a first carrier and a second carrier, and wherein the first carrier is comprised of a steel core and the second carrier is comprised of a magnetite.

Abstract: A carrier comprised of a core and thereover a polymer coating, and which coating is generated by the emulsion polymerization of one or more monomers and a surfactant, and wherein said polymer coating is of a diameter of equal to or less than about 100 nanometers.

Abstract: A carrier for an image developer for electrophotography, including core particles, and a coating layer covering each of the core particles, wherein the core particles have a weight average particle diameter of Dv which is 25-45 &mgr;m and a number average particle diameter of Dp which meets with the following condition: 1≦Dv/Dp≦1.3, wherein the core particles have such a particle size distribution that particles having a particle diameter of less than 44 &mgr;m is at least 70% by weight and particles having a particle diameter of less than 22 &mgr;m is not more than 7% by weight.

Abstract: A carrier core material having a voltage breakdown of at least 300V, essentially consisting of a magnetite base powder, the particles of which are surrounded by an electrically insulating coating essentially free from organic material.

Abstract: A carrier comprised of a core and thereover a polymer coating, and which coating is generated by the emulsion polymerization of one or more monomers and a surfactant, and wherein said polymer coating is of a diameter of equal to or less than about 100 nanometers.

Abstract: Carrier comprised of a core, a number of the pores thereof containing a polymer, and thereover a coating.

Abstract: A carrier for an image developer for electrophotography, including core particles, and a coating layer covering each of the core particles, wherein the core particles have a weight average particle diameter of Dv which is 25-45 &mgr;m and a number average particle diameter of Dp which meets with the following condition:

Abstract: A resin-coated carrier for an electrophotographic developer and a process of producing the carrier. The carrier comprises a ferrite core mainly comprising iron oxide, primarily having a spinel structure, and having a volume average particle size of 20 to 45 &mgr;m and a resin coat, wherein the carrier has a magnetization of 65 to 80 emu/g in a magnetic field of 1 KOe, the core has an electric current value of 50 to 150 &mgr;A and a surface smoothness uniformity of 75% or higher, and the amount of the resin coat is 0.1 to 5.0% by weight based on the core.

Abstract: There is provided a carrier, for an electrcostatographic developer, comprising particles of a hard magnetic ferrite material as the core, the core having a coating of a polymer resin, said resin in turn having a coating of an organic conductive material. The organic conductive material can be a charge control agent and can be present in very small amounts. The developer compositions have no need for preconditioning since they have stable charging characteristics. Further, they exhibit low levels of “dusting”.

Abstract: A process which comprises mixing a carrier core with a polymer core and polymer shell and wherein the polymer shell is present as a coating on said core and said polymer core, wherein said polymer core is generated by emulsification of and heating of monomer forming a seed latex; adding a portion of said seed latex to said emulsification mixture, followed by heating and adding another second portion of said seed latex; and wherein said shell is generated by emulsion polymerization of a monomer, followed by heating.

Abstract: A carrier for an image developer for electrophotography, including core particles, and a coating layer covering each of the core particles, wherein the core particles have a weight average particle diameter of Dv which is 25-45 &mgr;m and a number average particle diameter of Dp which meets with the following condition: 1≦Dv/Dp≦1.3, wherein the core particles have such a particle size distribution that particles having a particle diameter of less than 44 &mgr;m is at least 70% by weight and particles having a particle diameter of less than 22 &mgr;m is not more than 7% by weight.

Abstract: Carrier comprised of a core, a number of the pores thereof containing a polymer, and thereover a coating.

Abstract: A method for coating carrier particles wherein the carrier particles are stirred mechanically and wherein the volume of the coating solution is in the same order of magnitude as the volume of the carrier particles to be coated.

Abstract: The inventions concerns a new carrier core material consisting of particles of essentially pure, spherical magnetite. These particles are electrically insulated by an inorganic phosphorus containing coating.

Abstract: The invention concerns a new carrier core material having high voltage breakdown. The new material comprises a particulate ferrite base material having a substantially spherical particle shape, wherein the powder particles are coated with an inorganic, electrically insulating coating having a resistivity higher than that of the ferrite base material.

Abstract: A process which comprises mixing a carrier core with a polymer core and polymer shell and wherein the polymer shell is present as a coating on said core and said polymer core, wherein said polymer core is generated by emulsification of and heating of monomer forming a seed latex; adding a portion of said seed latex to said emulsification mixture, followed by heating and adding another second portion of said seed latex; and wherein said shell is generated by emulsion polymerization of a monomer, followed by heating.

Abstract: A carrier for electrophotographic developer essentially consisting of a core material of magnetic particles and thereon provided a resinous coating layer, wherein a weight-average particle-diameter(Dw) of the carrier ranges from 25 to 45 &mgr;m, the content of particles having diameter less than 44 &mgr;m is more than or equal to 75% by weight, the content of particles having diameter more than or equal to 62 &mgr;m is less than one percent by weight, the content of particles having diameter less than 22 &mgr;m is less than or equal to 7.0% by weight, the magnetic moment of the carrier at 1 kilo Oe of magnetic field is more than or equal to 76 emu/g. The carrier shows high optical density of image with no smearing of background area, good reproducibility in developing of small dots in image with no carrier deposition.

Abstract: A carrier for an image developer for electrophotography, including core particles, and a coating layer covering each of the core particles, wherein the core particles have a weight average particle diameter of Dv which is 25-45 &mgr;m and a number average particle diameter of Dp which meets with the following condition:

Abstract: A carrier for electrophotographic developer, including a core material and a resin layer formed on the surface of the core material, wherein the resin layer has a plastic deformation degree not less than 0.5 &mgr;m and an elastic deformation degree not less than 0.5 &mgr;m. The resin layer is preferably prepared by crosslinking a mixture including an acrylic resin having a reactive hydroxyl group and at least one of a perfectly-alkylated melamine compound and a perfectly-alkylated guanamine compound.

Abstract: Magnetic particles having an average particle size of 10 to 200 &mgr;m, comprising: magnetic core particles; and a coating layer formed on each surface of said magnetic core particles, comprising at least one metal alkoxide represented by the general formula (I): (RO)nM  (I)  wherein R is a C1 to C16 alkyl group; M is Al, Ti, Na, K, Ca, Zn or Fe; and n is an integer of 1 to 4, at least one silane-based coupling agent, and a silicone resin. Such magnetic particles have an excellent durability and a stable charging property.

Abstract: A carrier containing a core, and a polymer coating containing an inorganic polymer, an organic polymer and an optional further polymer, or polymers.

Abstract: A carrier comprised of a core and thereover a polymer, and which polymer contains dispersed therein a mixture of an inorganic polymer, and an organic metallic polymer.

Abstract: A carrier containing a core, a polymer coating or mixtures of polymers thereover, and wherein the coating polymer or mixtures contains a conductive polymer.

Abstract: Disclosed are a carrier for electrophotography, a method for producing the same carrier, and a developing agent using the same. The carrier includes a carrier core material with magnetism and a high-molecular-weight polyethylene resin that coats the surface of the carrier core material, wherein the surface of the high-molecular-weight polyethylene resin coating the surface of the carrier core material is coated with a resin layer having an ability to control an electric charge and a thickness of 0.01-2 &mgr;m or with a particle layer having an ability to control an electric charge and a thickness of 0.01-2 &mgr;m. The carrier for electrophotography and the developing agent using the same allow free control of its electrification polarity and free adjustment of the amount of electrification, taking advantage of excellent properties of the carrier having a polyolefin-based resin coat.

Abstract: A developer for electrophotography comprises toner particles and carrier particles. The carrier particles comprise at least two kinds of carriers particles having different charge giving characteristics onto the toner particles. Plural kinds of carrier particles having different charge giving characteristics act on one another and on the toner particles.

Abstract: A process for manufacturing a conductive micro-powder includes the steps of: (i) forming an aqueous dispersion of conductive material and the first surfactant, (ii) mixing a latex emulsion of a polymer and a second surfactant into the aqueous dispersion to form a suspension and (iii) recovering the conductive micro-powder from the suspension. The first and second surfactants are of the same class and polarity. The conductive micro-powder finds particular utility as a coating for carrier core particles, and as a conductive coating component of carrier particle coatings.

Abstract: A carrier with a core and thereover a polymer or mixtures of polymers, and wherein the polymer contains a conductive polymer dispersed therein. Alternatively, the carrier coating can be comprised of a conductive inorganic polymer or a polymer having dispersed therein a conductive inorganic polymer.

Abstract: A method for coating carrier particles wherein the carrier particles are stirred mechanically and wherein the volume of the coating solution is in the same order of magnitude as the volume of the carrier particles to be coated.

Abstract: A carrier for electrophotographic developer, including a magnetic core material whose surface is coated with a resin, wherein the carrier satisfies the following relationship: 1.0≦C2/C1≦1.3 wherein C1 represents a charge quantity of a developer (1) including the carrier and a first toner after the developer (1) is subjected to a frictional charge treatment once, wherein concentration of the first toner in the developer (1) is 3% by weight; and C2 represents a charge quantity of a developer (2) including the carrier, which has been separated from the developer (1) subjected to the frictional charge treatment, and a second toner when the charge quantity is measured after the developer (2) is subjected to the frictional charge treatment once, wherein concentration of the second toner in the developer (2) is 3% by weight, wherein the first and second toner are the same or different.