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5510187 |
Magnetic recording medium whose magnetic layer incorporates nonhalogenated vinyl copolymer and specified polyurethane polymer
Magnetic recording medium, comprising a magnetic layer provided on a nonmagnetizable substrate, wherein the magnetic layer comprises a magnetic pigment dispersed in a polymeric binder. The...
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5505880 |
Magnetorheological Fluid
A magnetorheological fluid essentially consists of magnetic particles which are coated with a polyelectrolyte and are suspended in a polar liquid. The fluid has a magnetorheological effect of more...
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5498644 |
Silcone elastomer incorporating electrically conductive microballoons and method for producing same
An electromagnetic interference shielding composition comprising a silicone elastomer having electrically conductive, magnetic, silver coated ceramic microballoons incorporated therein. The...
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5491029 |
Magnetic recording medium having a binder composition comprising phosphonated polyurethane and a vinyl chloride copolymer with ammonium functionalities
A binder composition suitable for use with magnetic media comprising: (i) a phosphonated polyurethane having a plurality of units of the formula: ##STR1## wherein: the nitrogen atom forms part...
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5487840 |
Magnetic fluid composition
A magnetic fluid composition comprising a low-volatile organic solvent as a carrier having dispersed therein ferromagnetic fine particles coated with a surface active agent having a lipophilic...
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5487951 |
Magnetic recording medium with a binder resin of a starblock copolymer having at least six arms
Magnetic recording medium of the type comprising magnetizable particles dispersed in a binder, wherein the binder comprises a star block copolymer having an average of at least six arms.
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5482777 |
Magnetic recording media and composition containing a specified polyurethane binder
According to this invention, there is provided a binder containing a polyurethane resin having an urethane bond and formed by the reaction of a diisocyanate and a polyol, said resin containing on...
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5470400 |
Rare earth anisotropic magnetic materials for polymer bonded magnets
This invention relates to a process for producing a non-pyrophoric, corrosion resistant rare earth-containing material capable of being formed into a polymer bonded permanent magnet comprising...
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5470401 |
Method of making bonded or sintered permanent magnets
An isotropic permanent magnet is made by mixing a thermally responsive, low viscosity binder and atomized rare earth-transition metal (e.g., iron) alloy powder having a carbon-bearing (e.g.,...
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5461132 |
Organic magnetic member, organic ferromagnetic member, and process for producing the same, and time-responsible organic ferromagnetic member and process for controlling development of ferromagnetism
An organic magnetic member comprises repetition units represented by the following general formula [I]: ##STR1## having at least one of R 1 and R 2 which is a substituted or unsubstituted...
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5456980 |
Ammonium carboxylate lubricant and magnetic recording medium using the same
A lubricant comprising a multifunctional ammonium carboxylate represented by the general formula (1) and a magnetic recording medium comprising a non-magnetic support having a magnetic layer...
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5457086 |
Superconducting composite for magnetic bearings
A composite includes granules of Type II superconducting material and granules of rare-earth permanent magnets that are distributed in a binder. The composite is a two-phase structure that combines...
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5449417 |
R-Fe-B magnet alloy, isotropic bonded magnet and method of producing same
A rare earth-iron-boron permanent magnet alloy having a composition represented by the formula: R a Fe b B c M d , wherein R represents one or more rare earth elements, M represents at least...
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5443746 |
Ferroelectric aerogel composites for voltage-variable dielectric tuning, and method for making the same
Ferroelectric composites are prepared by sol-gel derived procedures. The present invention utilizes the sol-gel process (1) to form a gel in a mold of the desired size and shape, (2) to dry the gel...
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5436070 |
Magnetic recording medium comprising a polyoxyalkylene oxide binder, a phosphoric ester dispersant and a cicular magnetic powder
A magnetic dispersion comprising finely divided iron power or iron alloy powder having a BET value of more than 35 m 2 /g dispersed in a polymeric binder and organic solvent, whose filterability...
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5435929 |
Permeable magnetic composition and magnetic component
Magnetic components having a higher permeability than those obtained from Ni-Zn-based ferrite powder can be obtained by molding a composition comprising 5-30 wt. parts of polyarylene sulfide resin...
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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...
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5419994 |
Carrier for electrophotographic developer, process for preparing the same and developer prepared by using said carrier
An iron carrier for an electrophotographic developer, the carrier having a mean particle diameter of 25 to 40 μm, a magnetization of at least 160 emu/g at 3000 Oe, an apparent density of 3.0 to...
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5415941 |
Magnetic recording medium comprising magnetic particles and a specified polyurethane resin
A magnetic recording medium comprise a non-magnetic support and a magnetic layer formed thereon which is made of a composition comprising ferromagnetic particles and a resinous binder. The resinous...
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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 SiO 2 and aluminum preferably...
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5409624 |
Bonded magnet moulding compositions
Compositions for making a bonded magnet product by conventional moulding techniques comprising high amounts of magnetic particles together with a polyamide resin and from about 0.2 to 3% by weight...
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5401571 |
Magnetic recording media having a binder comprising a sulfobetaine containing polyurethane resin
The sulfobetaine-containing resin has much improved affinity for magnetic powders. Therefore, by using the same as a binder, it becomes possible to attain good dispersion of magnetic powders...
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5395688 |
Magnetically responsive fluorescent polymer particles
This invention provides a novel process of producing magnetically responsive fluorescent polymer particles comprising polymeric core particles coated evenly with a layer of polymer containing...
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5393445 |
Rare-earth bonded magnet, material and method for manufacturing the same
A material for a rare-earth bonded magnet is prepared by coating a rare-earth magnetic powder with a heat resisting addition polymerizable thermosetting resin consisting essentially of a monomer or...
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5385707 |
Metal matrices for use in high gradient magnetic separation of biological materials and method for coating the same
Improvements in the existing procedures and materials for conduct of high gradient magnetic separation (HGMS) are disclosed. Superior superparamagnetic particles, optionally coated with a...
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5382373 |
Magnetorheological materials based on alloy particles
A magnetorheological material containing a carrier fluid and an iron alloy particle component. The particle component can be either an iron-cobalt alloy or an iron-nickel alloy. The iron-cobalt...
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5382862 |
Alternating current generator rotor
A rotor for an alternating current generator of the Lundell type. The rotor shaft carries two segments which have interleaved pole teeth. The rotor has a core member and a field coil disposed about...
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5382614 |
Perfluoropolyether lubricants for magnetic recordings
Difunctional perfluoropolyetheral compounds having polar or non-polar hydrogenated end groups, suitable for being used as inner lubricants in the chemical formulation of the active layer of...
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5376291 |
Bonded magnet molding composition and bonded magnet
Compositions for making a bonded magnet product by conventional moulding techniques comprise high amounts of magnetic particles together with a polyamide resin and from about 0.2 to 3% by weight of...
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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...
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5356713 |
Magnetizable composite microspheres of hydrophobic crosslinked polymer, process for preparing them and their application in biology
Magnetizable composite microspheres approximately from 0.05 to 10 μm in diameter, comprising a core of magnetizable particles and a shell of a hydrophobic crosslinked copolymer formed from a...
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5354488 |
Fluid responsive to a magnetic field
A rheological fluid composition which is responsive to a magnetic field. The composition comprises a vehicle, magnetizable particles suspended in the vehicle and a dispersant. The dispersant...
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5354638 |
Magnetic carrier for use in electrophotographic development
A magnetic carrier in the form of magnetic particles having a resinous coating on the surface thereof is used in combination with a toner for electrophotographic development. The resinous coating...
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5350558 |
Methods for preparing magnetic powder material and magnet, process for preparaton of resin composition and process for producing a powder molded product
There is disclosed a process for preparing a resin composition for powder molding, comprising 50 to 97 wt % of a metal or alloy powder and 50 to 3 wt % of a thermoplastic resin having heat...
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5342589 |
Process for converting chromium dioxide magnetic pigment particles into nonmagnetic chromium (III) oxide
According to a process for converting chromium dioxide into chromium (III) oxide, a composite comprising chromium dioxide particles dispersed in an organic matrix is provided. In a first heating...
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5330669 |
Magnetic coating formulations
A polyurethane resin is synthesized from a reaction mixture of at least one phosphorus compound, an epoxy compound, a polyisocyanate, a polyfunctional hydroxy compound, and optionally a chain...
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5322756 |
Magnetic fluids and method of preparation
The invention provides low optical density magnetic fluid which is a stable dispersion of fine magnetic particles. The invention further provides a method of forming the stable dispersion which...
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5320769 |
Magnetic paint and magnetic recording medium
A magnetic paint and objects coated with same are disclosed, where the magnetic paint is characterized by comprising, as its essential components, a block copolymer and magnetic powder, said block...
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5318838 |
Magnetic recording medium comprising ferromagnetic particles, binder resins and phenyl phosphonic acid
A magnetic recording medium comprising a non magnetic support having thereon a magnetic layer comprising binder resins, ferromagnetic particles and an organic phosporus compound.
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5300244 |
Method of preparing magnetic coating composition
A method of preparing a magnetic coating composition comprises a first process for kneading ferromagnetic grains, a binder and a binder solution Y1 by use of a two-shaft continuous kneading and...
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5298179 |
Water absorbent, comprising magnetic material and water absorbent resin
There is provided a water absorbent comprising a magnetic material and a highly water-absorbable resin. Said water absorbent is contacted with a moisture-containing powder and the water absorbent...
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5277984 |
Magnetic recording medium comprising ferromagnetic powder, a silane compound, and a binder comprising an epoxy group and specified functional group
A magnetic recording medium which comprises a magnetic layer is prepared by a dispersion of a powder of a ferromagnetic material in a binding material which is a macromolecular compound comprising...
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5271857 |
Process for preparing magnetic coating composition
The present invention provides a process for preparing a magnetic coating composition with use of magnetic particles containing carbon or magnetic particles consisting primarily of an iron carbide,...
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5268140 |
Thermoplastic coated iron powder components and methods of making same
A method is provided for producing a high strength iron based component by powder metallurgical techniques but without sintering. A powder composition of iron-based particles coated or admixed with...
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5266408 |
Magnetic recording media
Magnetic recording media consist of a nonmagnetic substrate and one or more magnetizable layers bonded thereon and based on a polyurethane binder, the binder consisting of not less than 50% by...
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5264157 |
Material based on an electronic conductive polymer incorporating magnetic particles and its production process
The invention relates to an electricity conducting material having magnetic properties constituted by an electronic conductive polymer in which are homogeneously dispersed permanent magnetic...
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5250206 |
Rare earth element-Fe-B or rare earth element-Fe-Co-B permanent magnet powder excellent in magnetic anisotropy and corrosion resistivity and bonded magnet manufactured therefrom
A R-Fe-B or R-Fe-Co-B permanent magnet powder excellent in magnetic anisotropy and corrosion resistivity, having powder particles. The powder particles each consist essentially of, in atomic...
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5250207 |
Magnetic ink concentrate
A magnetic ink concentrate essentially consisting of a dispersion of superparamagnetic solid particles in water or alcohol in the presence of a dispersant, and a process for its preparation.
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5250404 |
Silver halide photographic material having magnetic recording element
A silver halide photographic material is disclosed, comprising a transparent support containing a magnetic recording material, wherein the support is formed by co-flow-extending a dope containing...
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5248772 |
Formation of colloidal metal dispersions using aminodextrans as reductants and protective agents
The invention related generally to the preparation of colloidal metal(O) particles having a crosslinked aminodextran coating with pendent amine groups attached thereto. The aminodextran acts as...
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