Matches 101 - 150 out of 238 < 1 2 3 4 5 >

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5401313 Surface modified particles and method of making the same  
This invention relates to modifying the surface of particles for improved dispersion characteristics in aqueous, solvent, resinous, polymeric, cementitious or the like application systems. In...
5389482 Magnetic particle powder included in magnetic toners for magnetic image character recognition  
A specific magnetic particle powder is described, which is included in magnetic toners used for magnetic image character recognition (MICR). The magnetic particle powder is a magnetite particle...
5385798 Toner with boric acid charge additive  
A negatively charged toner composition comprised of resin, pigment particles, optional surface additives, and a boric acid, or salts thereof, charge enhancing additive.
5370957 Electrostatic developer and electrostatic developing method  
Disclosed herein are an electrostatic developer comprising image-forming particles which are magnetic, conductive particles having an average particle size of not more than that of the...
5358659 Magnetic materials with single-domain and multidomain crystallites and a method of preparation  
The disclosure relates to a method of forming magnetic materials having tunable magnetic properties and the magnetic materials formed thereby. The magnetic materials contain both single-domain and...
5359147 Electrostatic latent image developer  
An electrostatic latent image developer is composed of 10 to 70 parts by weight of a magnetic toner including at least a magnetic powder and a resin, the toner having an average particle size of 5...
5354637 Magnetic toner  
A magnetic toner is constituted by at least a binder resin and a magnetic iron oxide. The magnetic iron oxide is characterized by having an Fe(II) content of 18.5-24.1 wt. %, and shows a BET...
5338894 Image forming method with improved development  
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...
5334471 Low gloss encapsulated compositions  
A toner composition comprised of a core comprised of a polymer resin or resins, low remanence-magnetite of from between about 0.1 to about 8 gauss with an average volume particle diameter of from...
5328793 Magnetic particles for magnetic toner  
Disclosed herein are magnetic particles for a magnetic toner containing a low-molecular binder resin having a weight-average molecular weight of not more than 150,000, said magnetic particles...
5296326 Magnetic toner  
A magnetic toner for electrophotography having stable triboelectric chargeability under various environmental conditions may be provided by using magnetic iron oxide particles having a moderately...
5290650 Electrostatic image-developing positively chargeable toner and developer  
An electrostatic image-developing positively chargeable toner comprising at least toner particles containing a resin and a colorant, and conductive fine particles having their surface treated with...
5278018 Magnetic toner compositions containing charge enhancing additive particles  
A negatively charged toner composition comprised of crosslinked resin particles, silane treated magnetite particles, wax particles, charge enhancing additive particles, and surface additive particles.
5266458 Electrophotographic developer comprising silicon oil on its surface  
A developer for electrophotography is disclosed including a magnetic carrier and a magnetic toner having a surface, wherein a silicon oil is caused to adhere to the surface of the magnetic toner...
5254196 Security of negotiable instruments thru the application of color to xerographic images  
A fraud prevention system for magnetic ink character recognition includes providing a colored, highly reflective media and magnetic media over a non-magnetic toned image which can be an on-line or...
5248581 Toner for electrophotography  
A toner for electrophotography, which is obtained by attaching fine particles, each of which is formed by coating a core particles, e.g., metal oxide powders, ceramics, inorganic particles or...
5206106 Conductive magnetic toner  
A conductive magnetic toner including a magnetic powder having a specific resistance of not more than 1×106 Ω.cm in the amount of from 40% by weight to 60% by weight and a carbon black having a...
5199983 Black pigment particles  
Disclosed herein are black pigment particles comprising polycrystalline particles having a mixed composition of Fe2 TiO5 and Fe2 O3 --FeTiO3 solid solution.
5153091 Magnetic image character recognition toner and processes thereof  
An ionographic process which comprises the generation of an image comprised of characters, and developing the image with a toner mixture comprised of an encapsulated toner and a toner free of...
5147744 MICR processes with colored encapsulated compositions  
A colored magnetic encapsulated toner composition comprised of a core comprised of a polymer binder, magnetic metal particles, whitener, color pigment, dye or mixtures thereof, and which core is...
5145762 Processes for the preparation of toners  
A process for the preparation of toner compositions which comprises melt blending toner resin particles, magnetite particles, wax, and charge additives; adding to the aforementioned mixture a...
5143810 Magnetic toner for developing electrostatic image  
A magnetic toner for developing an electrostatic image comprises a binder resin and a spherical magnetic powder. The spherical magnetic powder comprises spherical magnetic particles. The spherical...
5135832 Colored toner compositions  
A colored magnetic encapsulated toner composition comprised of a core comprised of a polymer binder, a colorless or light colored magnetic material, a color pigment, dye or mixture thereof...
5127952 Core/oxide/dye pigmentary colorants  
Novel pigmentary colorants, well adapted for the production of electrostatic developer powders, are comprised of mineral core particulates, at least one mineral oxide and at least one dye, said at...
5124222 Toner and developer compositions having cleaning and lubricating additives  
Disclosed are toner compositions which comprise a toner particle having cleaning and lubricating agents added externally thereto. The cleaning and lubricating agents improve copy quality and...
5118587 Magnetic particles used for electrostatic latent image developer and process for producing the same  
Disclosed herein are magnetic particles used for an electrostatic latent image developer comprising composite particles containing from more than 80% by weight to not more than 99% by weight of...
5114819 Magnetic encapsulated toner compositions  
An encapsulated toner composition comprised of a core comprised of a polymer binder, a nonvolatile organic liquid, and magnetite; and wherein the core is encapsulated in a polyether-urea polymer...
5102755 Magnetic image character recognition processes  
An ionographic process which comprises the generation of a latent image comprised of characters; developing the image with a toner comprised of resin particles, magnetite particles, and a...
5080986 Magnetic image character recognition processes with encapsulated toners  
An imaging process which comprises the genertion of an image in an electronic printing magnetic image character recognition apparatus; thereafter developing the image with an encapsulated toner...
5071724 Method for making colored magnetic particles and their use in electrostatographic toner compositions  
The present invention provides for a method for the preparation of colored magnetic particles for multicomponent toner compositions in which colors are produced by means of a chemical reaction of...
5064739 Method of developing electrostatic charge pattern with magnetic developer  
In a method of developing a electrostatic charge pattern in which a magnetic brush is formed by supplying a developer consisting of a magnetic carrier and a magnetic toner onto a non-magnetic...
5026621 Toner for electrophotography  
A toner for electrophotography is disclosed, which comprises as the main components a coloring component and a binder resin which is a block copolymer comprising a functional segment (A)...
5021315 Method for making magnetic particles having improved conductivity and their use in electrostatographic printing applications  
The present invention provides for a method for the preparation of red colored magnetic particles for multicomponent toner compositions which are highly conductive and therefore suitable for use...
5002751 Highly-coercive isometric iron oxides, a process for the production and the use thereof  
Highly-coercive isometric iron oxide useful in magnetic toners for electrostatic photo-copying processes or for magnetic printers is produced by (a) subjecting Fe3 O4 pigment produced in a wet...
4999272 Electrophotographic analog and digital imaging and developing using magnetic toner  
An image forming method, comprising the steps of: providing an electrophotographic photosensitive member comprising an organic photoconductor, and a toner-carrying member carrying thereon a...
4985328 Dry toner, dry developer and process for forming electrophotographic images  
A dry toner composition comprising (A) a binder resin, (B) a colorant and (C) charge control agents comprising a special metal complex of oxycarboxylic acid (C-1) and a special metal complex of...
4977053 Magnetic-shell-coated toner  
Disclosured is a toner comprising colored particles and a magnetic shell coated thereon, wherein said colored particles are composed of a binder resin and a coloring agent, and said magnetic shell...
4975214 Magnetic iron oxide containing silicon element and process for producing same  
Magnetic iron oxide containing silicon element is produced in the form of generally octahedral particles having a sharp particle size distribution through a reaction of an aqueous solution of a...
4960668 Magnetic toner for electrophotography  
An insulative magnetic toner disclosed herein comprises a magnetic powder, a negative charge control agent, a binder resin and a compound having phenazine ring amorphous-silicon photoreceptor.The...
4946755 Electrophotographic one component magnetic toner comprising hydrophobic silica and iron oxide  
Disclosed is an electrophotographic magnetic toner comprising 40-80% binder resin, a waxy material such as a low molecular weight polypropylene or polyethylene, a charge control agent and 20-60%...
4935324 Imaging processes with cold pressure fixable toner compositions  
A process of imaging which comprises (1) generating an image; (2) developing the image formed with a single component pressure fixable toner composition with a resistivity of from about 104 to...
4931374 Electrophotographic positive charging toner containing a copper phthalocyanine blue pigment  
A toner for developing latent electrostatic images is disclosed which comprises a binder agent and ε-type copper phthalocyanine blue pigment which serves as coloring agent and positive polarity...
RE33172 Process for magnetic image character recognition  
Disclosed is an improved, simple, economical process for generating documents, such as personal checks, suitable for magnetic image character recognition, which process comprises generating such...
4877706 Single component cold pressure fixable encapsulated toner compositions  
A cold pressure fixing toner composition comprised of a core containing a polymer component and magnetic pigment particles, and wherein the core is encapsulated within a shell comrised of the...
4810610 Conductive single component cold pressure fixable magnetic toner compositions  
Disclosed are single component conductive cold pressure fixable toner compositions with a resistivity of from about 5×104 to about 107 ohm-cm for ionographic development systems and comprised of a...
4758493 Magnetic single component toner compositions  
A single component toner composition comprised of crosslinked resin particles, a low molecular weight wax component, magnetite, and external additive particles selected from the group consisting...
4758506 Single component cold pressure fixable encapsulated toner composition  
Disclosed is an improved single component cold pressure fixable toner composition comprised of a core containing (1) magnetite particles, and a styrene-butadiene-styrene triblock polymer and a...
4758490 Magnetic color toner for electrophotographic copying machine  
Color magnetic toner particles suitable for an electrophotographic copying machine comprise magnetic particles whose diameter is selected less than about 200 angstroms, a coloring agent and a...
4695524 Process for ultra high quality images with magnetic developer composition  
Disclosed is a process for generating consistent high quality images comprised of (1) providing a xerographic imaging or printing apparatus; (2) adding thereto a stable two component developer...
4652510 Method for forming negative and positive images in electrophotographic process  
Disclosed is an electrophotographic process which comprises developing an electrophotographic light-sensitive layer having an electrostatic charge image of a certain polarity with a one-component...
Matches 101 - 150 out of 238 < 1 2 3 4 5 >