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4420537 |
Magnetic recording medium having cobalt adsorbed iron oxide layer
A magnetic recording medium comprises a substrate coated with a magnetic composition comprising a cobalt adsorbed iron oxide powder with a phosphoric ester type anionic surfactant at a ratio of 2...
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4419257 |
Magnetic coating composition
A magnetic coating composition is disclosed of the type having magnetic particles dispersed in a resin binder. The improvement comprises the use of a solvent system including a dibasic ester...
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4416751 |
Process for producing a ferrofluid
A ferrofluid comprised of composite particles comprised of polymer-enmeshed magnetic metallic particles in indefinite suspension in a carrier fluid is produced by providing a pair of electrodes...
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4412929 |
Magnetic wall covering composition
A magnetic wall covering composition consisting of magnetic iron oxide particles and glue.
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4410440 |
Polyurethane magnetic disk coatings
A polyurethane coating material for magnetic recording disks which is composed of magnetic particles, solvent blends and a thermosetting binder system. The resins are made from blocked isocyanates...
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4405370 |
Magnetic ink refining method
A magnetic ink refining method according to which the fine magnetic particles dispersed unstably in the magnetic ink are sedimented and removed by applying a concentrated magnetic field to the...
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4404260 |
Magnetic recording medium and method of manufacture
A magnetic recording medium, having formed on the surface of a non-magnetic substrate, a layer of the dispersion in a binder vehicle of magnetic particles having the surface thereof coated with a...
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4404253 |
Magnetic recording medium
Magnetic recording medium using water as dispersion medium. The magnetic layer comprises as binder an aqueous dispersion of polyurethane having functional groups capable of salt formation and a...
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4397751 |
Magnetic disk coatings
A magnetic disk coating composition contains magnetic particles and a binder system comprising epoxy and phenolic resins, a titanate coupling agent and a water miscible solvent system, the coating...
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4396659 |
Magnetic recording medium
A magnetic recording tape or disc which has excellent physical characteristics of adhesive strength, a repeated running durability, and a gloss degree of the surface as well as excellent...
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4381244 |
Ferrofluid
A ferrofluid comprised of composite particles comprised of polymer-enmeshed magnetic metallic particles in indefinite suspension in a carrier fluid is produced by providing a pair of electrodes...
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4364988 |
Magnetic recording medium
An improved magnetic recording medium is disclosed, particularly a magnetic tape suitable for sound recording and video recording, which comprises as a recording element a mixture of...
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4363850 |
Magnetic recording medium
A magnetic recording medium which comprises a base material and a magnetic layer provided thereon. The magnetic layer comprises magnetic particles, a cellulose resin and a polyurethane resin as the...
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4362802 |
Powdery developing material for electrophotographic reproduction
A dry developing powder composition particularly suited for use in electrophotographic reproduction which comprises a magnetic toner of 35 to 50 microns in average particle size mixed with a...
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4361627 |
Magnetic recording medium
The present invention relates to a binding agent for a magnetic recording medium which consists of a non-magnetic substrate with a magnetic layer formed thereon. The magnetic layer is composed of a...
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4359516 |
Magnetic resist printing process, composition, and apparatus
A process of forming an image of toner on a latent magnetic image in a magnetic member followed by direct transfer to and coalescence on a surface to form a resist is disclosed. The surface portion...
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4358388 |
Magnetic polymer latex and preparation process
Magnetic-polymer latex having a concentration of less than 65% by weight of hydrophobic vinyl aromatic polymer particles. The polymer particles have diameters from 0.03 to 5 microns and also have...
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4357259 |
Method of incorporating water-soluble heat-sensitive therapeutic agents in albumin microspheres
A method is provided for incorporating water-soluble therapeutic agents in albumin microspheres. This method is particularly advantageous where the therapeutic agent is heat-sensitive. All steps of...
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4356232 |
Method for producing magnetic recording medium
A method for producing a magnetic recording medium which comprises preparing a dispersion containing a ferromagnetic powder and a binder in the presence of non-alkali beads and coating the...
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4341855 |
Photographic element provided with a magnetic recording stripe and method and composition for manufacture thereof
Photographic elements are provided with a magnetic stripe that is useful for sound recording by applying a magnetic striping composition, containing finely-divided magnetic particles and an...
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4340494 |
Process for the manufacture of ferromagnetic chromium dioxide
A process for the manufacture of ferromagnetic chromium dioxide modified with foreign elements, by reacting oxides of trivalent and hexavalent chromium under superatmospheric pressure at an...
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4340644 |
Magnetic recording medium
A magnetic recording medium consisting of a base coated with magnetic coating material which is a dispersion of magnetic particles using a vinyl chloride-vinyl acetate copolymer and a polyester...
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4339337 |
Process for the preparation of magnetic beads of vinylaromatic polymers
Process for the preparation of magnetic beads of vinylaromatic polymers, which comprises dispersing a magnetic filler in a solution of a homo- or co-polymer in a vinylaromatic compound alone or in...
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4336308 |
Magnetic recording media
A magnetic recording medium and, more particularly, a magnetic recording medium based on a magnetic composition exhibiting high dispersibility of finely divided ferromagnetic powders and having...
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4334887 |
Method for flocculating metal oxide particles in an organic medium
A method for complexing metal oxide particles in an organic medium is disclosed. The method comprises incorporating into said medium an effective amount of a complexing agent of the formula:...
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4327346 |
Anisotropic polymeric magnet in the tubular form and process for producing the same
In an anisotropic polymeric magnet in tubular form, the magnetization orientation is directed in one direction perpendicular to the axial line of the tubular magnet. In a bipolar anisotropic magnet...
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4320080 |
Method to manufacture soft magnetic pressed bodies
To permit use of less expensive iron powder material and manufacture of more complex shapes, a mixture of iron powder, of an approximate grain size of between 30 to 450 μm, and containing...
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4311779 |
Developer for developing electrostatic latent images
Disclosed is a one-component type magnetic developer which comprises a binder medium and 45 to 65% by weight, based on the total developer, of fine particles of a magnetic material dispersed in the...
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4308155 |
Rubber or plastic magnet and magnetic powder for making the same
A rubber or plastic magnet of high magnetic properties is produced by incorporating a magnetoplumbite type magnetic powder into a rubber or thermoplastic or thermosetting matrix at a high...
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4305993 |
Magnetic recording medium
A magnetic recording medium which comprises a base material and a magnetic layer provided on its surface, said magnetic layer comprising metallic magnetic particles, a binder and a salt of lanolin...
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4303738 |
Magnetic media having tridecyl stearate lubricant
Magnetic recording media highly loaded with magnetic oxide particles. This media possesses a very smooth surface finish, and in operation exhibits low media wear, as well as low wear of an...
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4302510 |
Magnetic recording medium
A magnetic recording medium having more than 550 Oersted of a coercive force, less than 1.8 of a ratio of a coercive force at -196° C. to a coercive force at 25° C., less than 1.0 wt. % of a...
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4299882 |
Magnetic recording medium and process
A magnetic recording medium which comprises a base and a magnetic layer of a magnetic coating composition comprising magnetic particles and a binder provided on said base, characterized in that the...
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4296176 |
Inks for pulsed electrical printing
A printing ink comprises particles of small size, each having a body portion consisting of a fusible resin and a colorant and electrically conductive material situated substantially entirely on the...
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4293627 |
Process of developing magnetic images and dry magnetic toner compositions
This invention is generally directed to toner compositions comprised of a magnetic material and a resin comprising a polymeric esterification product of 1,4-benzenedicarboxylic acid polymerized...
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4289549 |
Resin bonded permanent magnet composition
An improved magnetic material for a permanent magnet including at least 90 volume percent of a single phase of a samarium-transition metal alloy in a 2-17 molar ratio is provided. The alloy may be...
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4288516 |
Polyester resin containing magnetic toner material and process for its use in flash fuser
A new magnetic toner comprising a magnetic material and a resin comprising a polymeric esterification product of a dicarboxylic acid and a diol comprising a diphenol is disclosed. This toner is...
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4287282 |
Composite magnetic developer
Disclosed is a composite magnetic developer which consists essentially of a homogeneous intimate mixture comprising a plurality of electrically insulating magnetic particulate developers comprising...
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4287281 |
Magnetic toner composition and a method of making the same
Magnetic toner compositions are prepared using two types of magnetic particles. The first type of magnetic particles have hydrophilic surface characteristics and the second type of magnetic...
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4286022 |
Coating of fine particles in polyurethane block copolymer binder
Coating of fine particles such as magnetizable particles in a binder which is a soluble hydroxyl-terminated polyurethane block copolymer comprising soft or flexible blocks synthesized from...
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4285825 |
Method of producing magnetic coating material for magnetic recording media
A magnetic coating material for magnetic recording media is produced by dispersing a magnetic coating material containing from 0.1 to 2.0% of an abrasive and from 0.05 to 1.0% of a betaine type...
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4282296 |
High speed magnetographic imaging process
This invention generally is directed to methods for developing images, including latent magnetic and electrostatic images, which involves forming latent images on a suitable substrate and...
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4282302 |
Ferrite powder type magnetic toner used in electrophotography and process for producing the same
A ferrite powder type magnetic toner used in an electrophotography. It comprises a resinous component and a ferrite having a spinel structure comprising components of iron oxide at a ratio of 99.9...
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4281043 |
Polymodal magnetic recording media and compositions useful therein
Polymodal magnetic information-recording articles formed with at least two different populations of magnetic powders, whereby at least one of the powders, being of lower intrinsic coercivity and...
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4278556 |
Process for producing flexible magnets
Procedure for pulverizing ferrite particles for use in the production of flexible magnets utilizing alcohols containing up to 4 carbon atoms and having a boiling point up to 100° C. as a...
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4275115 |
Magnetic recording composition and article coated therewith
A magnetic recording composition comprising a non-aqueous dispersion, in liquid dispersion medium, of a dispersed solid phase of a major proportion of magnetic powder and minor proportions of at...
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4272749 |
Reactor core of insulated iron powder
A reactor formed by winding a conductor on a core which is formed by using mutually insulated particles of iron powder to provide a closed magnetic path. The reactor is less in leakage flux and has...
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4272600 |
Magnetic toners containing cubical magnetite
This invention is generally directed to magnetic toners comprised of a styrene butadiene copolymer resin, and a cubically shaped magnetite material, which toners have a fusing latitude range of at...
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4271248 |
Magnetic latent image toner material and process for its use in flash fusing developing
A method for developing magnetic latent images comprising forming a latent image on a suitable substrate and contacting said image with a magnetic toner which comprises a magnetic material and a...
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4268599 |
Treated toner magnetic carrier and method of making the same
Method and means is disclosed for treating carrier particles in order to change the charge to mass ratio and the resistivity of a development powder encompassing such particles. The carrier...
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