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5244736 |
Magnetic recording medium having multiple magnetic layers with specified compositions
A magnetic recording medium comprising a non-magnetic support having thereon a multi-layer magnetic layer structure comprising ferromagnetic fine powder and a binder, wherein said multi-layer...
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5244739 |
Magnetic recording media comprising a cured dispersion coating of a magnetizable pigment and polyurethane polymer containing a vinyl polymeric segment pendant from the polyurethane backbone
The invention relates to vinyl sulfonated and non-sulfonated hydroxy functional polyurethane copolymers prepared from macromonomer diols and their use in magnetic recording media. The sulfonated...
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5242964 |
Process for the preparation of aqueous dispersions of magnetizable polymer particles with a desired size narrow distribution, and aqueous dispersions thereof, and uses thereof
A process for the preparation of aqueous dispersions of magnetizable polymer particles with a narrow distribution from aqueous dispersions with a wide distribution. The amount of water in the...
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5240626 |
Aqueous ferrofluid
An aqueous ferrofluid comprises a plurality of colloidally-dispersed magnetite particles and a dispersing aid. The magnetite particles are coated with an anti-agglomeration agent which is a...
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5240640 |
In situ use of gelatin or an aminodextran in the preparation of uniform ferrite particles
A method is described for the preparation of uniform colloidal particles of ferrites, containing manganese(II), at a relatively low temperature in the presence of an aminodextran solution which...
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5236648 |
Method of manufacturing a reference member for calibrating toner concentration monitors in electrophotographic document production apparatus
A toner concentration reference member which shows substantially no temperature effects is manufactured by a process employing the milling of ferrite particles together with the epoxy beads for...
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5234614 |
Method for producing magnetic coating composition and magnetic recording medium
A magnetic coating composition prepared by a method comprising a wetting step for wetting powder materials including a magnetic powder with a small amount of a solvent in a kneading machine having...
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5232782 |
Magnetizable "core-shell" microspheres based on a cross-linked organopolysiloxane and a process for their preparation
Magnetizable "core-shell" microspheres comprising a core of a magnetizable filler and a shell of crosslinked organopolysiloxane obtained by dispersing an aqueous suspension of a magnetizable...
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5230818 |
Coating compositions for master media for anhysteretic recording
A coating composition is provided for master media for anhysteretic transfer of magnetically recorded information to a copy medium which comprises from about 50 to about 69% of a magnetic pigment,...
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5229219 |
Magnetic recording medium comprising a magnetic layer containing a specified magnetic ferrite powder and having a curie temperature up to 180° C.
According to the invention, a magnetic recording medium is formed by using magnetic powder having a composition of the following formula: MeOn[Fe 2 -x-y-z Ga x Cr y Al z O 3 ] wherein Me...
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5228930 |
Rare earth permanent magnet power, method for producing same and bonded magnet
There is disclosed a R-Fe-B or R-Fe-Co-B alloy permanent magnet powder which may contain Ga, Zr or Hf, or may further contain Al, Si or V. Each individual particle of the powder includes a...
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5227283 |
Silver halide photographic material
A silver halide photographic material is disclosed comprising a support having provided thereon at least one light-sensitive silver halide emulsion and at least one transparent magnetic recording...
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5225282 |
Biodegradable magnetic microcluster comprising non-magnetic metal or metal oxide particles coated with a functionalized polymer
Subdomain metal or metal oxide particles covalently coupled to chemically reactive organic moieties and subsequently reacted together to form biodegradable magnetic microclusters are disclosed. The...
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5219663 |
Magnetic recording medium having a magnetic layer formed from an aromatic polycarbonate polyurethane resin
A polycarbonate polyol having a main chain of the formula: ##STR1## wherein R is an aliphatic or alicyclic hydrocarbon group having 4 to 10 carbon atoms, and n is a number of 2.00 to 20.00, and...
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5217542 |
Method for producing surface-treated magnetic powder
This invention relates to a method for producing surface-treated magnetic power for high record density magnetic recording medium which has excellent dispesibility and high filling density and...
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5217804 |
Magnetic particles
Magnetic particles are cobalt surface treated gamma iron oxide (Fe 2 O 3 ) having a specific area of at least 30 m 2 /g and a powder coercivity greater than about 450 Oe, the particles being...
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5217810 |
Magnetic recording medium having a magnetic layer containing chromium dioxide particles and linolenic acid
Magnetic recording media consisting of a nonmagnetic substrate and at least one magnetizable layer which is firmly applied thereon and is based on a magnetic material which essentially consists of...
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5213631 |
Rare earth-iron system permanent magnet and process for producing the same
A rare earth-iron permanent magnet which is formed from an ingot of an alloy composed of at least one rare earth element represented by R, Fe, B and Cu, by the hot working at 500° C. or above...
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5213703 |
Anisotropic neodymium-iron-boron system plastic bonded magnet
This invention relates to an anisotropic neodymium-iron-boron system plastic bonded magnet containing from 10 to 20% by weight an anisotropic neodymium-iron boron system magnetic powder having a...
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5206159 |
Polymer particles containing colloidal iron oxide granules for use as a magnetically responsive reagent carrier
Substantially spherical polymer particles containing a colloidally, stably and uniformly dispersed magnetically responsive substance of about 5 nm to about 500 nm in diameter provide a...
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5198138 |
Spherical ferrite particles and ferrite resin composite for bonded magnetic core
Disclosed herein are ferrite particles for a bonded magnetic core comprising crystal grains of 5 to 15 μm in average diameter, having an average particle diameter of 20 to 150 μm and a magnetic...
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5190684 |
Rare earth containing resin-bonded magnet and its production
A resin bonded magnet which comprises a resinous binder and melt quenched magnetically isotropic ferromagnetic alloy particles having a coercive force of 8 to 12 KOe of the formula: Fe 100 -x-y-z...
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5181971 |
Magnet and method of manufacturing the same
This specification discloses a method of manufacturing a magnet roller having the step of disposing a plurality of pairs of magnetic poles each comprising the starting magnetic pole and terminal...
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5178953 |
Magnetic recording media having a binder comprising a low molecular weight high glass transition temperature vinyl polymer
Disclosed are magnetic particle coating compositions employing a low molecular, high T g vinyl polymers characterized by having one or more primary alcohol containing groups pendant to the polymer...
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5176842 |
Method of manufacturing a resin bound magnet
A method of manufacturing a resin bound magnet comprising, mixing and kneading a powdered magnetic material and a rubber modified epoxy resin obtained from the addition polymerization of an epoxy...
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5173206 |
Passivated rare earth magnet or magnetic material compositions
Oxidation of fully dense rare earth magnets is reduced when a passivating agent such as an oxidation resistant composition or corrosion inhibitor or combinations thereof, is coated thereon. The...
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5169721 |
Magnetic recording media comprising a polyurethane binder resin containing perfluoro groups
Magnetic recording media consist of a nonmagnetic substrate and at least one magnetizable layer which is firmly applied thereon and is based on a polyurethane binder, not less than 50% by weight of...
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5164239 |
Magnetic disc assembly comprising a disc having a magnetic layer with a specified composition and a case having a specified liner
A magnetic disc is disclosed, which comprises a disc-shaped magnetic recording medium having a magnetic layer comprising a ferromagnetic powder and a binder and a case having a liner of a nonwoven...
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5164104 |
Magnetic material containing rare earth element, iron, nitrogen, hydrogen and oxygen and bonded magnet containing the same
A magnetic material represented by the formula R α Fe (100-α-β-γ-δ) N β H γ O δ wherein R is at least one rare earth element inclusive of Y; α is from 5 to 20 atomic percent, β...
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5160447 |
Compressed powder magnetic core and method for fabricating same
A compressed powder magnetic corer is disclosed in which the mixing ratio (vol %) of the parts occupied by binder resin, ferromagnetic powder and void formed therebetween is set for a specified...
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5158830 |
Magnetic recording medium comprising a polyurethane resin coating residual groups derived from specified phosphorous containing compounds
A magnetic coating formulation is composed principally of magnetic particles and a binder. At least a portion of the binder is a polyurethane resin synthesized from a reactant mixture of specific...
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5153079 |
Magnetic recording medium comprising ferromagnetic powder and polar group containing ginder resins having different glass transition temperatures
A magnetic recording medium is disclosed which comprises a non-magnetic support and a magnetic layer comprising a ferromagnetic powder having a specific surface area of not less than 55 m 2 /g and...
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5153071 |
Magnetic recording medium wherein the magnetic layer has as the binder system a vinyl chloride copolymer and a polyether polyurethane resin which contains a ring structure
A magnetic recording medium comprising a non-magnetic support having thereon a magnetic layer comprising ferromagnetic particles disposed in a binder, the binder comprising a vinyl chloride...
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5151333 |
Magnetic recording medium comprising a magnetic layer or backcoat layer containing a specified dispersant
Disclosed is a magnetic recording medium comprising a non-magnetic support and a magnetic layer composed mainly of a ferromagnetic powder and a binder, which is formed on one surface of the...
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5149477 |
Process for producing a resin bonded magnet structure
A process for producing resin bonded magnet structures is disclosed which includes the steps of: (a) adding a solid epoxy resin of at least one epoxy oligomer and a microcapsule which contains at...
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5137783 |
Acicular magnetic metal particles containing iron as main ingredient and process for producing the same
Disclosed herein are acicular magnetic metal particles containing iron as the main ingredient the surfaces of which are coated with a polymer formed from at least one of silicone compounds...
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5138546 |
Sintered transformer core of MnZn-ferrite and a transformer comprising such a core
The invention relates to a sintered transformer core of MnZn-ferrite material, the initial permeability of which ranges between 10 and 1000. Said transformer cores preferably have an average...
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5135673 |
Organic ferromagnetic substance
An organic ferromagnetic substance and a process for producing same are disclosed, which substance is a product of the carbonization of at least one polymer in mid course of graphitization selected...
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5134035 |
Magnetic recording medium containing a polyurethane copolymer with a free radically polymerized polymer segment grafted to the polyurethane through a sulfur atom
The invention relates to a sulfonated, thiol, and hydroxy-functional polyurethane polymer which comprises: (i) a polyurethane backbone; (ii) at least one SO 3 M group pendant from the polyurethane...
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5128216 |
Lubricants for magnetic media
Amphiphilic compound having one of the following structures: (X--T) n --A--Y m and (X-T) n --R--(T--A) n wherein X is a fluorocarbon terminal group, T is a polar linking group, A is a nucleus...
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5128215 |
Magnetic recording media binder resin comprising a mixture of a straight block copolymer and a star block copolymer
The present invention provides an improved magnetic recording medium comprising a non-magnetic support with at least one magnetic layer comprising a magnetizable pigment dispersed in a binder...
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5118580 |
Magnetic recording media prepared from polyurethane copolymers formed utilizing an interferter compound
The present invention relates to an inferter compound of the formula I(T) n wherein I represents the free radical initiator portion of the iniferter compound and wherein I comprises a...
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5118565 |
Magnetic recording medium having a magnetic layer containing a fatty acid, a fatty acid ester and a single specified carbon black
A magnetic recording medium comprises a non-magnetic substrate and a magnetic recording layer provided on said substrate, comprising (a) 100 parts by weight of magnetic powder, (b) 5 to 15 parts by...
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5118348 |
Magnetic ink for non impact printing of documents
The present invention relates to a ribbon for non-impact printing of documents of the type handled by magnetic reader/sorter apparatus comprising a polycarbonate substrate and a magnetic ink layer...
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5116685 |
Magnetic recording medium comprising a polyester polyurethane polymer and a small percentage of a low molecular weight polyol
Compositions for magnetic recording media comprising a nonmagnetic support and a magnetic layer adhered to the nonmagnetic support, wherein the magnetic layer comprises a ferromagnetic substance...
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5114604 |
Resin bonded permanent magnet and a binder therefor
A curable resin binder comprising an epoxy resin which is a solid at room temperature, an epoxy resin curing agent which is inactive at room temperature, and as a curing accelerator, a pyridine...
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5110624 |
Method for preparing magnetizable porous particles
Magnetizable, porous particles are prepared by contacting a first portion of porous particles with a suspension comprised of magnetite particles, coated with a dispersing agent, and water, removing...
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5108636 |
Magnetizable composite particles based on crosslinked organopolysiloxane, process for preparation thereof and their application in biology
Magnetizable composite particles, optionally in aqueous dispersion, consisting of a matrix based on a crosslinked organopolysiloxane, optionally bearing nonvinyl reactive and/or ionic units and...
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5109038 |
Polymer particles which carry, implanted on their surface, amphiphilic molecules carrying ion-forming or reactive groups, a process for the preparation of these particles and their use in biological applications
Polymer particles which carry, implanted on their surface, amphiphilic molecules carrying ion-forming or reactive groups, and dispersions thereof, which may be prepared by contacting a latex of...
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5104751 |
Magnetic recording medium lubricant comprising a phthalic acid diester and fatty acid ester
A magnetic recording medium having an improved running durability is disclosed, which comprises a non-magnetic support having formed thereon a magnetic layer mainly composed of a ferromagnetic...
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