Entries |
Document | Title | Date |
20080233509 | SPHERICAL SILICA CORE-SHELL PARTICLES - A process of preparing spherical nano-sized core/shell silica particles, including providing a latex polymer dispersion comprising particles of a liquid dispersible starting polymer in a dispersion liquid, adding at least one functionalized monomer to the latex polymer dispersion and polymerizing the at least one functionalized monomer on the particles, and growing an outer silicate shell on the particles through addition and reaction of at least one silane monomer. | 09-25-2008 |
20080241728 | Methods for reducing plasticization and blocking in toner compositions - Use of a wax in a toner, such as carnauba wax, to give an increase in charge control agent in a toner, such as a magenta toner, to give an increased glass transition temperature is disclosed. The toner may contain a resin comprising amorphous and crystalline polyesters to provide good low melt characteristics. | 10-02-2008 |
20090004592 | Carrier Compositions - 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. | 01-01-2009 |
20090047594 | Developer - A developer according to the present invention is arranged such that the composition of particulate metal oxide added as an external additive to a toner surface and the composition of particulate metal oxide added to a resin layer covering a carrier surface are identical to each other, so that the amount of frictional charge that is generated between the toner and the external additive is made larger than the amount of frictional charge that is generated between the external additive and the carrier surface. With this, the external additive is prevented from migrating from the toner surface onto the carrier surface. This makes it possible to prevent the external additive from migrating from the toner surface onto the carrier surface, and thereby to remedy (i) defects in charge and fluidity and (ii) secondary failures, i.e., defects in development that are caused by deterioration in performance of the developer due to the defects in charge and fluidity. | 02-19-2009 |
20090053643 | Magnetic mono-component toner for developing electrostatic latent image and image forming method - The present invention provides a magnetic mono-component toner which can suppress a selection development on a latent image carrier and can maintain favorable image properties for a long period by using a toner having the coarse powder distribution (S) within a given range in a jumping developing method and an image forming method which uses the toner. In the toner used in the jumping developing method which develops an electrostatic latent image formed on a latent image carrier using a developer carrier, the toner includes toner particles which contain at least a binding resin and a magnetic powder, and the coarse powder distribution (S) of the toner particles satisfies a following formula (1). | 02-26-2009 |
20090142688 | COMPOSITION FOR COATING CARRIER PARTICLES - A dry powder carrier coating composition that may be used to coat carrier particles that imparts desired triboelectric charging characteristics and conductivity values to make the carrier particles more insulative. In embodiments, the coating composition includes a styrene acrylate copolymer. | 06-04-2009 |
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 |
20090226838 | CARRIER, DEVELOPER, DEVELOPING APPARATUS AND IMAGE FORMING APPARATUS - There are provided a carrier which enables stable charging of toner and formation of a stable, high-definition and high-quality image which has very few image defects such as a fog, as well as a developer, a developing apparatus, and an image forming apparatus. A carrier is obtained by including a carrier core and a coating layer with which a surface of the carrier core is coated, the coating layer being obtained by curing a resin composition for coating that includes a crosslinked silicone-modified acrylic resin containing a macromonomer represented by the following general formula (1). A developer is obtained by such a carrier and a toner. | 09-10-2009 |
20090311620 | CARRIER, TWO-COMPONENT DEVELOPER COMPRISING THE SAME, AND DEVELOPING DEVICE AND IMAGE FORMING APPARATUS USING THE TWO-COMPONENT DEVELOPER - A carrier has a thermosetting silicone resin layer formed of a core particle and a thermosetting silicone resin on the surface of the core particle, and the thermosetting silicone resin layer is formed by subjecting a thermosetting silicone resin to a thermosetting treatment at a temperature lower than the melting point of a charge control agent contained in the thermosetting silicone resin layer, and includes an inner region which contains a positively chargeable charge control agent and an outer region which does not contain any positively chargeable charge control agent. The two-component developer containing the carrier as described above is charged into a developing device in an image forming apparatus to form an image. | 12-17-2009 |
20100040969 | Toner Formulations with Tribocharge Control and Stability - A toner composition and a method of making a toner composition wherein toner particles having an average size in the range of 1-25 μm may be mixed with silica particles and alumina particles surface treated with an inorganic/organic compound. The silica particles may have a primary particle size in the range of 2 nm to 20 nm and may be present in the range of 0.01% to 3.0% by weight of the toner composition. The alumina particles surface treated with an inorganic/organic compound may be present in the range of 0.01% to 1.0% by weight of the toner composition. | 02-18-2010 |
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 |
20100233613 | CARRIER - A carrier which is capable of avoiding excess blocking of the carrier particles at the time of forming a covering layer and is excellent in durability, a developer containing the carrier, and a developer container containing the developer, as well as an image forming method and a process cartridge which use the developer are provided. A carrier including at least a core material particle and a covering layer, a surface of the core material particle being covered with the covering layer, wherein the covering layer contains a condensate which is obtained by condensation of a silicone resin having at least one of a silanol group and a functional group which can be converted to the silanol group by hydrolysis, using a titanium diisopropoxy bis(ethylaceto-acetate) catalyst. | 09-16-2010 |
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 |
20100279224 | METHOD FOR PRODUCING ELECTROPHOTOGRAPHIC CARRIER AND ELECTROPHOTOGRAPHIC CARRIER PRODUCED BY USING THE METHOD - In a method for coating electrophotographic carrier core surfaces with a resin composition by rotating a rotator having a plurality of agitating blades on its surface in a casing; a coating treatment material that is introduced to a space defined between the rotator and the casing is in a packing of from 50% to 98% by volume; at the time of coating treatment, the electrophotographic carrier core surfaces are coat-treated with the resin composition while being put forward and put backward; and the electrophotographic carrier cores and the resin composition are, at the time of coating treatment, temperature-controlled at a specific temperature T (° C.) or below. This method enables the electrophotographic carrier core surfaces to be more uniformly coated with a coating resin. | 11-04-2010 |
20100330492 | CARRIER FOR ELECTROSTATIC DEVELOPMENT, DEVELOPER FOR ELECTROSTATIC DEVELOPMENT, DEVELOPER CARTRIDGE FOR ELECTROSTATIC DEVELOPMENT, PROCESS CARTRIDGE AND IMAGE FORMING APPARATUS - The invention provides a carrier for electrostatic development, including ferrite particles and a coating layer including a resin having a cycloalkyl group, the ferrite particles including strontium in an amount of from about 0.1% by weight to about 1.0% by weight and having a BET specific surface area of from about 0.13 m | 12-30-2010 |
20100330493 | SURFACE-MODIFIED COMPLEX OXIDE PARTICLES - Disclosed are particles which are useful as an external toner additive which can control physical properties of a toner. Specifically disclosed are surface-modified complex oxide particles which are obtained by surface-modifying silica-titania complex oxide particles produced by a dry process. | 12-30-2010 |
20110008724 | TWO-COMPONENT DEVELOPER, DEVELOPING DEVICE, IMAGE FORMING APPARATUS, AND IMAGE FORMING METHOD - A two-component developer is provided. The two-component developer includes a toner containing a binder resin, a colorant and a release agent, and a resin-coated carrier composed of a carrier core material and a resin coating layer formed on a surface of the carrier core material. The toner has an exposure rate of the release agent on the toner surface of 1.00% or above and 3.07% or below. The carrier core material has an apparent density of 1.86 g/cm | 01-13-2011 |
20110045399 | ELECTROSTATIC IMAGE DEVELOPING CARRIER, ELECTROSTATIC IMAGE DEVELOPER, PROCESS CARTRIDGE, IMAGE FORMING METHOD AND IMAGE FORMING APPARATUS - An electrostatic image developing carrier includes a ferrite particle and a resin layer that coats the ferrite particle, wherein a magnesium element content of the ferrite particle is from about 3.0% by weight to about 20.0% by weight; wherein a manganese element content of the ferrite particle is from about 0.2% by weight to about 0.8% by weight; and wherein a content of toluene is more than about 100 ppm and not more than about 2,000 ppm. | 02-24-2011 |
20110171573 | CARRIER, DEVELOPER USING THE CARRIER, AND DEVELOPING DEVICE, IMAGE FORMING METHOD, IMAGE FORMING APPARATUS AND PROCESS CARTRIDGE USING THE DEVELOPER - A carrier for use in a two component developer for developing an electrostatic latent image is provided. The carrier includes a particulate core material; and a cover layer located on a surface of the core material and including a silicone resin and barium sulfate. The cover layer includes Ba and Si at an atomic ratio of from 0.01 to 0.08 as determined by X-ray photoelectron spectroscopy. | 07-14-2011 |
20110217649 | CARRIER, DEVELOPER, AND IMAGE FORMING METHOD - The present invention provides a carrier which includes core material particles, and a coating layer on surfaces of the core material particles, wherein the coating layer contains a crosslinked product which is obtained by condensation of a cone resin with an organic zirconium catalyst, the silicone resin having at least one of a silanol group and a functional group capable of generating a silanol group by means of hydrolysis. | 09-08-2011 |
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 |
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 |
20120015291 | ELECTROSTATIC IMAGE DEVELOPING CARRIER, ELECTROSTATIC IMAGE DEVELOPER, IMAGE-FORMING METHOD, DEVELOPER CARTRIDGE, PROCESS CARTRIDGE, AND IMAGE FORMING APPARATUS - An electrostatic image developing carrier includes a core particle and a coating layer on the core particle. The coating layer contains a resin having a crosslinked structure formed by using at least one compound selected from boric acid and boric acid derivatives. | 01-19-2012 |
20120064451 | CARRIER FOR DEVELOPING ELECTROSTATIC LATENT IMAGE, AND TWO-COMPONENT DEVELOPER, SUPPLEMENTAL DEVELOPER, IMAGE FORMING APPARATUS, PROCESS CARTRIDGE, AND IMAGE FORMING METHOD USING THE CARRIER - A carrier comprising a magnetic core particle having a shape factor SF-2 of 130 to 160 and a resin layer covering a surface of the magnetic core particle. The resin layer comprises a conductive particle and a resin obtained by heating a copolymer comprising a silicon-containing A unit and another silicon-containing B unit having. | 03-15-2012 |
20120208121 | CARRIER CORE MATERIAL FOR ELECTROPHOTOGRAPHIC DEVELOPER, METHOD FOR MANUFACTURING THE SAME, CARRIER FOR ELECTROPHOTOGRAPHIC DEVELOPER AND ELECTROPHOTOGRAPHIC DEVELOPER - A carrier core material for electrophotographic developer containing a soft ferrite, expressed by (Mg | 08-16-2012 |
20120295195 | CARRIER CORE PARTICLES FOR ELECTROPHOTOGRAPHIC DEVELOPER, METHOD FOR MANUFACTURING THE SAME, CARRIER FOR ELECTROPHOTOGRAPHIC DEVELOPER AND ELECTROPHOTOGRAPHIC DEVELOPER - The carrier core particles | 11-22-2012 |
20120322004 | ELECTROSTATIC CHARGE IMAGE DEVELOPING CARRIER, METHOD OF PRODUCING ELECTROSTATIC CHARGE IMAGE DEVELOPING CARRIER, ELECTROSTATIC CHARGE IMAGE DEVELOPING DEVELOPER, PROCESS CARTRIDGE, IMAGE FORMING APPARATUS, AND IMAGE FORMING METHOD - An electrostatic charge image developing carrier includes a core particle and a coating layer with which the surface of the core particle is coated. The coating layer includes an acrylic resin having a constituent unit in which a silicone chain is disposed in a branch. | 12-20-2012 |
20130011780 | CARRIER CORE PARTICLE FOR ELECTROPHOTOGRAPHIC DEVELOPER, CARRIER FOR ELECTROPHOTOGRAPHIC DEVELOPER AND ELECTROPHOTOGRAPHIC DEVELOPER - A carrier core particle for an electrophotographic developer includes a core composition expressed by a general formula: Mn | 01-10-2013 |
20140023966 | CARRIER FOR DEVELOPING ELECTROSTATIC LATENT IMAGE, AND ELECTROSTATIC LATENT IMAGE DEVELOPER - A carrier for developing electrostatic latent images includes a core material; and a covering layer formed of a resin comprising an electroconductive particulate material, overlying the core material, wherein the covering layer includes the electroconductive particulate material in an amount of from 58 to 73% by weight and has a resistivity of from 6.6 to 8.6 Ωcm, and wherein the carrier has a high-brightness contrast part at an areal ratio less than 1% and 40 to 90% based on total area thereof at an acceleration voltage of 0.8 KV and 2.0 KV, respectively in an FE-SEM reflection electron image of the surface thereof. | 01-23-2014 |
20140072910 | CARRIER FOR DEVELOPING AN ELECTROSTATIC LATENT IMAGE, DEVELOPER AND IMAGE FORMING APPARATUS - A carrier for developing an electrostatic latent image of the present invention includes a core material and a coating layer which coats the core material, wherein the coating layer includes a resin and fine particles, wherein the coating layer has an average layer thickness difference of 0.02 μm to 3.0 μm, and wherein the carrier for developing an electrostatic latent image has an arithmetic mean surface roughness Ra1 of 0.5 μm to 0.9 μm. | 03-13-2014 |
20140178813 | METHOD FOR MANUFACTURING FATTY ACID METAL SALT PARTICLE, AND FATTY ACID METAL SALT PARTICLE - A method for manufacturing a fatty acid metal salt particle includes forming a coating layer including a fatty acid metal salt on a surface of a core material particle in supercritical carbon dioxide. | 06-26-2014 |
20140287355 | CORE MATERIAL FOR RESIN-FILLED FERRITE CARRIER AND FERRITE CARRIER FOR ELECTROPHOTOGRAPHIC DEVELOPER, 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 having an average compression strength of 100 mN or more and a coefficient of variation of the compression strength of 50% or less, a ferrite carrier obtained by filling a resin in the voids of the ferrite carrier core material, and an electrophotographic developer using the ferrite carrier. | 09-25-2014 |
20160033889 | CARRIER CORE PARTICLES FOR ELECTROPHOTOGRAPHIC DEVELOPER, CARRIER FOR ELECTROPHOTOGRAPHIC DEVELOPER, AND ELECTROPHOTOGRAPHIC DEVELOPER - A method for manufacturing carrier core particles for electrophotographic developer that include manganese, magnesium, and iron as a core composition. The method includes a granulation step (A) of granulating a mixture of raw materials containing manganese, magnesium, and iron with a reducing agent added at a ratio of 0.10% to 1.00% by mass to a total mass of the raw materials containing manganese, magnesium, and iron, and a firing step of firing the granular material granulated in the granulation step. The firing step includes a first heating step (C) of applying heat at a constant temperature ranging from 500° C. to 800° C. in an atmosphere with an oxygen concentration of 1000 ppm to 15000 ppm for a predetermined period of time and a second heating step (D) of applying heat at a temperature higher than 800° C. for a predetermined period of time after the first heating step. | 02-04-2016 |