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7381513 |
Carrier, developer, image forming method and process cartridge for electrostatic image development
A carrier containing a core material and a resin coating layer located overlying the surface of the core material. The resin coating layer contains resin and electroconductive particles having an...
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7314696 |
Electrophotographic toner and development process with improved charge to mass stability
Toners and developers are disclosed. The toner of the present invention contains at least one toner resin, at least one charge control agent, at least one surface treatment agent, and optionally at...
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7252919 |
Carrier and developer for latent electrostatic image development, container housing developer, image forming process, image forming apparatus, and process cartridge
A carrier for electrostatic development contains a core particle and a coating layer covering the core particle, and the core particle is a ferrite particle containing at least one of Zr in an...
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7192679 |
Carrier for electrophotographic developer
The present invention relates to a carrier for electrophotographic developers, a developer containing the carrier, a container for the developer, a image forming apparatus using the developer, an...
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7183033 |
Carrier core material, coated carrier, two-component developing agent for electrophotography, and image forming method
A carrier core material for an electrophotographic developing agent, which comprises 100 parts by weight of a ferrite component represented by a formula (A) and 0.1 to 5.0 parts by weight of ZrO 2 ...
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7172846 |
Carrier, developer, image forming apparatus and process cartridge
A carrier including a manganese ferrite core material having a layer on its surface such that 0.1≦K≦30, where K=(S/M)×100, S and M represent the standard deviation and average of M 2/ (M 1 +M...
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7144669 |
Carrier and developer for latent electrostatic image development, container housing developer, image forming process, image forming apparatus, and process cartridge
A carrier for electrostatic development contains a core particle and a coating layer covering the core particle, and the core particle is a ferrite particle containing at least one of Zr in an...
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6936394 |
Replenishing developer and developing method
An electrostatic latent image on an image-bearing member is developed with a two-component developer comprising a toner and a carrier stored in a developer vessel while supplying as required a...
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6905806 |
Dry two-component type developer for electrophotography
A dry two-component developer for electrophotography comprising a carrier particle and a toner particle, wherein a toner water adsorption ratio (T) obtained by a following equation (1) for the...
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6723481 |
Method for using hard magnetic carriers in an electrographic process
Methods for development of an electrostatic image are disclosed that utilize developer compositions with hard magnetic carrier compositions which can provide improved development efficiencies and...
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6686113 |
Carrier for electrophotographic developer and developer containing the same
A resin-coated carrier to be mixed with a polymer toner obtained by suspension polymerization or emulsion polymerization to provide an electrophotographic developer, which exposes 2 to 20% of the...
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6627370 |
Hard carrier particles coated with a polymer resin and a conductive material
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...
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6582870 |
Carrier for electrophotographic developer and electrophotographic developer containing the same
A carrier for an electrophotographic developer comprising spherical magnetic core particles which have a volume average particle size of 25 to 45 μm, an average void size of 10 to 20 μm, a volume...
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6544707 |
Two component developing agent and an image forming apparatus by use of the same
There is disclosed a two-component developing agent for use in an mage formation based on electrophotography, which has high developability even at a high speed printing and good developability in...
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6506531 |
Magnetic carrier
A magnetic carrier exhibiting excellent durability against mechanical impact as exerted by vibration and capable of exhibiting a stable charging performance in electrophotography is provided. The...
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6358656 |
Developer or toner comprising a particle having a treatment
The present invention generally relates to a treatment for an electrographic toner. The treatment can include at least one titanium dioxide particle having a BET surface area of at least about 70 m...
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6294304 |
Environmentally benign high conductivity ferrite carrier with widely variable magnetic moment
A ferrite carrier includes manganese oxide, ferric oxide and minor amounts of titanium dioxide and provides an environmentally benign, highly conductive, reprographic carrier powder.
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6232026 |
Magnetic carrier particles
Conductive hard magnetic carrier particles are disclosed which contain a single-phase hexagonal crystal structure doped with at least one metal that, upon substitution of said metal into said...
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6197466 |
Electrophotographic toner surface treated with metal oxide
An electrophotographic toner composition comprising toner particles admixed with metal oxide, wherein the metal oxide is selected from titanium dioxide and silicon dioxide; the metal oxide is 0.1...
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6187490 |
Resin-coated carrier, two-component developer and image forming method
A two-component developer suitable for electrophotography is formed of a toner and a resin-coated carrier. The resin-coated carrier is formed of carrier core particles and 0.01-2.0 wt. % based on...
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6124069 |
Electrophotographic carrier comprising a coating of a grafted fluoropolymer
A carrier composition is provided for electrophotographic development. Core particles are coated with a graft copolymer of a fluoropolymer and methyl methacrylate. The core particles preferably are...
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6090517 |
Two component type developer for electrostatic latent image
Disclosed is a developer for developing an electrostatic latent image, comprising: a carrier prepared by coating a magnetic particle with a resin by a surface polymerization coating method, the...
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6054243 |
Carrier and developer material, and an image forming method
A silicone resin-coated carrier for a developer of an electrostatic latent image is disclosed. The surface index S of the carrier is between 10.0 and 70.0. S=(S BET /X)/Sc S BET : BET...
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6051354 |
Coated carrier
A process for the preparation of carrier comprised of mixing in a high shear device a carrier core and a carrier coating.
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6017668 |
Toner compositions
A toner comprised of resin, colorant, and a surface additive mixture of a magnetite and a polyvinylidene fluoride.
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5994019 |
Image forming method
An image forming method is disclosed in which a contact charging means is brought into contact with a latent image bearing member to electrostatically charge the latent image bearing member on...
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5929136 |
Coated carriers
A composition comprised of a core and thereover a mixture of a first and second polymer, and wherein said first polymer contains a conductive component, and said second polymer contains copper...
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5900343 |
Ferrite carrier for electrophotographic development
An Li--Mn type ferrite carrier for use in electrophotographic development comprising ferrite particles having a chemical composition of 3 to 15% of Li 2 O, 5 to 35% of MnO and 60 to 90% of Fe 2 O...
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5885741 |
Carrier for electrostatic latent image development and coating agent for use therein
A coating agent for a carrier for electrostatic latent image development comprised of (A) an organopolysiloxane having the formula (R 3 SiO 1 /2) a (R 2 SiO 2 /2) b (RSiO 3 /2) c , wherein R is...
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5876893 |
Ferrite carrier, two-component developer and electrostatic imaging method using the developer
An Li--Mn ferrite carrier comprising 2 to 15 mol % of Li 2 O, 5 to 30 mol % of MnO and 60 to 90 mol % of Fe 2 O 3 . The carrier may contain at least one sintering aid selected from the group...
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5798198 |
Non-stoichiometric lithium ferrite carrier
A non-stoichiometric lithium ferrite powder having a compositional range represented by the formula: (Li 2 O) 0 .25 (Fe 2 O 3 ) 0 .25 ! x (Fe 2 O 3 ) 1 .00-x where 0.35<x≤0.50 mole...
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5795692 |
Carrier composition and processes thereof
A carrier composition comprised of a core comprised of a magnetic oxide with a coating thereover comprised of the reaction product of a metal, preferably a zinc vapor and the magnetic oxide.
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5744274 |
N-(2-cyanoethenyl)sulfonamides having two functionalities and toner compositions containing them
There is provided an electrostatographic toner comprising a polymeric binder and a charge-control agent having the general structure: ##STR1## wherein A, B, R 2 , and R 3 are defined in the...
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5733699 |
Developer for developing electrostatic latent image
A developer for developing an electrostatic latent image is disclosed. It is obtained by mixing a chargeable magnetic toner mainly composed of a binder resin and magnetic powder, which toner has a...
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5709975 |
Coated hard ferrite carrier particles
This invention provides an electrophotographic carrier comprising hard ferrite particles, said particles having a coating comprising a silicone resin and a colloidal silica.
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5693444 |
Electrostatic-image developer and image forming process
An electrostatic-image developer which comprises a toner and a carrier comprising core particles coated with a coating resin, wherein the toner comprises toner particles having a volume-average...
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5688623 |
Carrier for developing electrostatic latent image
A carrier for developing electrostatic latent image includes a ferrite core particle which contains MnO and 0.5 to 4 molar percent of CaO, and a resin coating layer formed on the core particle.
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5637431 |
Developer for electrophotography
Disclosed is a developer for electrophotography, comprising a carrier and toner particles, wherein said carrier comprises a magnetic particle having thereon a resin coated layer, said magnetic...
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5629120 |
Electrostatic image developing carrier and electrostatic image developer
The present invention provides an electrostatic image developing carrier which exhibits an enhanced maintenance of image quality, can be prevented from being attached to the image and thus can...
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5620824 |
Toner, developer and image forming method
A toner for developing an electrostatic image has colored resin particles-(A) containing a coloring agent or a magnetic powder, and a powdery additive. The powdery additive has organic resin...
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5595850 |
Ferrite carrier for electrophotographic developer and developer containing the carrier
A ferrite carrier for electrophotographic developers which comprises a Mn-Mg ferrite having the general formula (MnO) x (MgO) y (Fe 2 O 3 ) z wherein x+y+z=100 mol % and SrO is substituted for...
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5516615 |
Stabilized carriers with β phase poly(vinylidenefluoride)
A method for converting α-phase poly(vinylidene fluoride) to β-phase poly(vinylidene fluoride), for preparing electrostatographic carrier and, electrostatographic developer and carrier. In the...
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5516614 |
Insulative magnetic brush developer compositions
An insulating developer composition comprised of resin particles, pigment particles, wax component particles, compatibilizer, and a surface additive mixture comprised of metal salts of fatty acids,...
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5512403 |
Mixture of carrier particles useful in electrographic developers
The invention provides a mixture of coated carrier particles suitable for use in dry electrographic developer wherein each of the types of carrier particles occupies a position in the triboelectric...
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5496675 |
Carrier coating and processes
A process for the preparation of conductive, electronegative, submicron polymeric particles comprised of a first polymer optionally containing from about 1 to about 50 percent by weight of a...
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5491042 |
Method for manufacturing a resin-coated carrier for an electrophotographic developer
This invention provides a method for manufacturing a resin-coated carrier for an electrophotographic developer comprising the steps of coating the surface of a carrier core which is a dielectric...
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5422216 |
Developer composition and method of preparing the same
A method for preparing the carrier for a developer composition is provided. The method comprises subjecting a ferric oxide and a metal oxide to conditions sufficient to form a ferrite have a spinel...
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5358818 |
Ortho-benzoic sulfimide as charge-controlling agent
This invention is directed to dry, negatively charged toner compositions and developer compositions, the toner composition being comprised of resin particles prepared from a polyester having a...
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5358817 |
Toner compositions containing as a negative charge-controlling agent the calcium salt of ortho-benzoic sulfimide
This invention is directed to dry, negatively charged toner compositions and developer compositions, the toner composition being comprised of resin particles prepared from a polyester having a...
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5358816 |
Zinc salt of ortho-benzoic sulfimide as negative charge-controlling additive for toner and developer compositions
This invention is directed to dry, negatively charged toner compositions and developer compositions, the toner composition being comprised of resin particles prepared from a polyester having a...
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