Matches 51 - 100 out of 238 < 1 2 3 4 5 >


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6475687 Magnetic composite particles for black magnetic toner and black magnetic toner using the same  
Magnetic composite particles having an average particle diameter of 0.06 to 1.0 μm and a coercive force value of less than 39.790 kA/m, comprising: magnetic core particles,a coating formed on...
6451495 Toner and developer compositions with charge enhancing additives  
A toner comprised of resin, colorant, and a potassium stearate charge enhancing additive.
6447968 Magnetic toner, process for producing magnetic toner, and image forming method  
A magnetic toner for developing an electrostatic latent image has magnetic toner particles containing at least a binder resin, a magnetic powder and a wax component. The magnetic powder has...
6426169 Toner containing azo iron compound  
A toner having a stable chargeability in various environments, a stable fixability over a wide temperature range and a resistance to sticking on an image-bearing member, is formed of a binder...
6355194 Carrier pelletizing processes  
A process for the preparation of microsynthetic carrier comprising the melting of a mixture of binder resin, magnetic component, colorant and optionally charge control additive, thereby forming a...
6258501 Developing agent and image forming apparatus  
Disclosed is a two-component developing agent comprising toner which includes a second magnetic powder added in an amount of 4 wt % or less with respect to the weight of toner particles which...
6183925 Two component developer comprising specific magnetic toner and specific magnetic carrier  
This invention provides a two-component developer comprising magnetic carrier particles and toner particles which contain magnetic particles at a specified content, being excellent in high speed...
6140001 Iron oxide microparticles and a process for producing them  
The invention resides in iron oxide particles having very small particle size, high saturation magnetization and low remanent magnetization. The invention also resides in a process for producing...
6048920 Magnetic nanocomposite compositions and processes for the preparation and use thereof  
A magnetic nanocomposite composition comprising from about 0.001 to about 60 weight percent of nanocrystalline particles of Fe3 O4, and from about 40 to about 99.999 weight percent of a resin.
6017668 Toner compositions  
A toner comprised of resin, colorant, and a surface additive mixture of a magnetite and a polyvinylidene fluoride.
6007957 Magnetic toner, image forming method and process cartridge  
A magnetic toner includes magnetic toner particles containing at least a binder resin and a magnetic iron oxide. The magnetic iron oxide contains 0.2 to 4.0% by weight of at least one metal...
6004711 Toner composition including positive and negative tribocharging hydrophobic extra-particulate additives  
Toner compositions comprise (a) a toner particulate including resin, magnetic component and charge control agent, and (b) an extra-particulate additive comprising a first hydrophobic additive...
5976752 Toner and image forming method  
An electrophotographic toner is composed of at least a binder resin, a colorant, and a wax. The binder resin (a) comprises a polyester resin, a vinyl resin and a hybrid resin component comprising...
5914209 Single development toner for improved MICR  
The use of a mixture of hard and soft magnetites as well as a lubricating wax in the formulation of single component developers is disclosed. The mixture allows for sufficient high remenance for...
5914210 Developer and developing method  
In the present invention, in carrying out reversal development of an electrostatic latent image formed on a positively charged amorphous silicon type photoreceptor, a developer including...
5908726 Electrophotographic toner and method for forming images  
An electrophotographic toner includes a binder resin including a linear polyester such as a polyester formed by condensation of an ethylene oxide adduct of a bisphenole A with a terephthalic acid,...
5885740 Magnetite particles, a process for producing them and applications thereof  
Magnetite particles that contain 0.1-5.0 wt % of P, 0.1-5.0 wt % of Al and optionally up to 5.0 wt % of Si on the basis of Fe, that have σr /SSA ratio of no more than 0.9 (σr, residual magnetic...
5882832 One component developer developing method and dry toner therefor  
A dry toner useful for one component developer developing method is provided which has good image qualities and durability without contamination of developing apparatus. The toner includes a metal...
5858593 Magnetic toner, apparatus unit and image forming method  
Disclosed are a magnetic toner for developing an electrostatic latent image comprising magnetic toner particles containing a binder resin of 100 parts by weight and a magnetic substance of 20 to...
5843610 Magnetic particles for magentic toner and process for producing the same  
A magnetic toner containing 100 parts by weight of magnetic Fe2+ -containing iron oxide particles having an average particle size of 0.05 to 0.30 μm, containing not less than 0.9 atm % and less...
5750302 Magnetic toner for developing electrostatic image, image forming process, and process cartridge  
A magnetic toner for developing an electrostatic image has magnetic toner particles containing at least a binder resin and magnetic iron oxide particles. The magnetic iron oxide particles have...
5736288 Toner for developing electrostatic images, process cartridge, and image forming method  
A toner is comprised of a composition containing at least a polymer component and a charge control agent. The polymer component contains substantially no tetrahydrofuran (THF)-insoluble matter....
5712070 Toner for developing electrostatic image, image forming method, developing device and process cartridge  
A toner for developing electrostatic images is constituted by toner particles comprising a binder resin and a colorant. The toner is characterized by having (i) a particle size distribution...
5705305 Developer for developing electrostatic latent image  
A developer for developing an electrostatic latent image formed on an photosensitive body, including a toner, a fluidity improving material, a cleaning material, and hydrophobic fine particles...
5695901 Nano-size magnetic particles for reprographic processes and method of manufacturing the same  
Provided is a method for producing nano-size magnetic particles, and particularly magnetite and maghemite particles, that are useful in preparing toner products for reprographic processes. The...
5695900 Surface treatment of magnetic particles for use in reprographic processes  
Provided is a method for producing nano-size magnetic particles, and particularly magnetite and maghemite particles, that are useful in preparing toner products for reprographic processes. The...
5674655 Electrostatographic toners containing metal oxides  
This invention comprises a toner particle comprising a polymeric binder and a metal oxide; wherein the metal oxide is blended throughout the polymeric binder.
5667924 Superparamagnetic image character recognition compositions and processes of making and using  
An image character recognition process comprising: forming an image in a predetermined size and predetermined shape on a receiver member with a marking composition containing a superparamagnetic...
5663026 Magnetic toner, process cartridge and image forming method  
A magnetic toner is formed from a binder resin and silicon-containing magnetic iron oxide particles. The magnetic toner has a weight-average particle size of at most 13.5 μm, and the magnetic...
5652060 Spherical magnetic particles for magnetic toner and process for producing the same  
Spherical magnetic iron oxide particles for a magnetic toner comprise: Fe2+ -containing iron oxide particles having an average particle diameter of 0.05 to 0.30 μm, containing 1.7 to 4.5 atm % of...
5641601 Electrophotographic toner with magnetic particle additive  
An electrophotographic toner suitable for use in an image-forming apparatus employing an organic photoconductor is disclosed which comprises toner particles and, adherent to the surface thereof,...
5599627 Magnetic particles comprising magnetite core and process for producing the same  
Magnetic toner particles composed of magnetite core particles containing 0.10 to 1.00 wt % silicon and a hydrous coprecipiate of silica and alumina deposited or adhered on the surfaces of the...
5561018 Magnetic toner  
A magnetic toner having a specific surface area of not more than 3.0 m2 /g computed by the Brunauer Emmett Teller equation and the number of molecules of CO2 gas, being equal to 100/nm2 to...
5552252 Magnetic toner imaging  
A process for avoiding or minimizing comet formation which comprises dispersing in a magnetic toner comprised of resin particles, a first magnetite, carbon black, charge additive, and wax, a...
5532095 Magnetic toner  
A magnetic toner includes at least binding resin (for instance, a styrene-acryl resin) and magnetic powder (for instance, Mn--Zn ferrite or Ni--Zn ferrite) having a saturation magnetization of at...
5527657 One-component magnetic toner for use in electrophotography  
A one-component magnetic toner with high resistivity for use in electrophotography for developing latent electrostatic images to visible toner images by contact development, includes a coloring...
5516612 Toner and developer compositions and processes thereof  
Disclosed is a process for enhancing xerographic developer tribo product longevity comprising providing developer particles comprised of a toner comprised of at least one resin, pigment, charge...
5510221 Magnetic toner compositions  
A process for avoiding, reducing, or minimizing comet formation which comprises adding to the surface of a magnetic toner comprised of resin particles, magnetite, carbon black, optional charge...
5504272 Magnetic toner having defined particle distribution  
An image forming method in which a toner-carrying member for carrying a specific magnetic toner is placed adjacent a latent image-bearing member for carrying an electrostatic latent image so as to...
5499083 Developing method using a developing agent conveying sleeve of a small diameter and toner for the developing agent used therefor  
A developing method using a compact machine such as a copying machine for personal use, etc., employs a two component-type magnetic developing agent with small diameter photosensitive drum and...
5494768 Toner composition containing ethylene bisamide compounds  
A toner composition is disclosed capable of developing electrostatically charged images formed on an electrophotographic member, comprising styrene-based resin particles, pigment particles, a...
5489497 Magnetic toner compositions with surface additives  
A toner comprised of resin, magnetite treated, or coated with a phosphate titanium component, optional wax, charge additive, and surface additives comprised of silica and metal oxides.
5486443 Magnetic toner compositions with silica, strontium titanate and polyvinylidene fluoride  
A toner comprised of resin particles, magnetite, carbon black, rhodamine charge additive, wax, and a surface mixture of silica, strontium titanate and polyvinylidene fluoride.
5482806 Developer composition for electrostatic latent image comprising toner and carrier coated with inorganic oxide particles  
A dry developer composition for an electrostatic latent image is disclosed. The developer composition comprises a magnetic powder-dispersed type carrier comprising a binder resin having dispersed...
5482805 Magnetic toner compositions with aluminum oxide, strontium titanate and polyvinylidene fluoride  
A toner comprised of resin particles, magnetite, carbon black, rhodamine charge additive, wax, and a surface mixture of aluminum oxide, strontium titanate and polyvinylidene fluoride.
5436102 Magnetic developing agent and electrophotographic apparatus using said agent  
An apparatus develops an electrostatic latent image formed on an image carrier by attaching a developing agent containing toners, thereby converting the latent image into a toner image, transfers...
5432037 Image-forming process, developer and image-forming system  
Disclosed herein are an image-forming process which comprises steps of:uniformly charging a latent image carrier by a charging member disposed in contact with or in close vicinity to the latent...
5429899 Magnetic materials  
Herein are disclosed a resin magnet excellent in flow characteristics and magnetic properties comprising a surface modified magnetic powder in respect of which the surface of the magnetic powder...
5424810 Magnetic toner, magnetic developer, apparatus unit, image forming apparatus and facsimile apparatus  
A magnetic toner for electrophotography is composed from a binder resin and a silicon-containing magnetic iron oxide. The magnetic toner has a weigh-average particle size o at most 13.5 μm and has...
5411830 Magnetic developer, electrophotographic apparatus and recognition method of magnetic ink character  
A magnetic developer including magnetic toner particles is formed from a magnetic material containing silicon preferably in an amount of 0.1-1.0 wt. % calculated as SiO2 and aluminum preferably in...

Matches 51 - 100 out of 238 < 1 2 3 4 5 >