Synthetic resin

A magnetic recording element suitable for use in an automatic ticket vending unit and an automatic ticket checking and collecting unit which comprises a substrate and a layer coated thereon, said coating layer comprising 100 parts, by weight, of .gamma.-ferrite particles, 1 to 2 parts of a dispersing...     

A magnetic recording medium comprising a base having a coating thereon containing magnetic particles, and wherein the binder contains a vinyl terpolymer and a diisocyanate.

Humidity-insensitive electrostatographic ferrite carrier materials having an average particle diameter from between about 30 to about 1,000 microns prepared by blending an essentially stoichiometric mixture of ferrite forming metal oxides, calcining the blended oxides to provide the blended oxides with...     

An organo-iron compound or complex, having an X-ray diffraction pattern similar to that of magnetite and containing from 25 to 50 per cent or more iron, is water soluble and exhibits strongly ferromagnetic properties both as a solid and in aqueous solution. The compound is prepared by (1) precipitating...     

A magnetic recording material which comprises a support having thereon a magnetic recording layer comprising a ferromagnetic substance and a binder, wherein the ferromagnetic substance comprises a mixture of (1) a Berthollide iron oxide having a particle size of about 0.5 .mu. or larger and a degree...     

A magnetic recording medium consists of a non-magnetic base, on which the magnetic coating is a layer of a dispersion, containing a lubricant, of a magnetic pigment in a polymeric binder. The lubricant is a block copolymer which contains siloxane units and alkyleneoxy units of 2 to 4 carbon atoms, the...     

Magnetic recording tape especially suitable for use as video tape and computer tape, comprising a base carrying a magnetic coating which consists essentially of a dispersion of a finely divided magnetic pigment and at least one lubricant in an organic binder. The lubricant is a compound of the formula...     

Coated magnetic recording media, especially video tapes and computer tapes, comprising a non-magnetic base carrying a magnetic coating which consists of a dispersion, essentially containing a finely divided magnetic pigment in an organic binder and at least one lubricant. A compound of the formula ##STR1##...     

A method for the preparation of composite particles having a specified range of particle size and comprising a finely divided, magnetic, particulate material embedded in a matrix of a linear polymeric material, which method comprises the steps of: A. forming discrete liquid droplets consisting of or...     

A magnetic toner composition for use in decorating a magnetically imaged substrate in magnetic printing machines comprising a particulate blend of between about 50% and about 99% by weight of colored magnetic particles and between about 1% and about 50% by weight of optically innocuous, non-magnetic,...     

A magnetic wedge is made by preparing a composition of a thermosetting resin system and magnetizable particles, placing the composition in a mold, vibrating the mold at least until air bubbles are no longer evolved from the composition, curing the composition, and fabricating the lower portion of the...     

A magnetic coating composition is disclosed which comprises a dispersion of magnetic particles in a solution of an epoxy resin having an average of between 1 and 3 epoxy groups per molecule and having an epoxy equivalent in the range about 400 to 4,000 and containing an organic acid which boils below...     

Method of making an anisotropic permanent magnetic body which has a (B.H).sub.max of at least 1.4 .times. 10.sup.6 Gauss . Oersted and a remanence of at least 2500 Gauss, utilizes magnetic powder particles having a coercivity .sub.J H.sub.C at least equal to the actual remanence B.sub.r of the finally...     

A magnetic filter element comprises a rubber bonded barium ferrite permanent magnet strip enclosed in a thin, liquid impervious, non-magnetic envelope and positioned in a low velocity location in a fluid system to capture magnetically attractable contaminants. The disclosure illustrates various arrangements...     

Compositions comprising stable, water-insoluble coatings on substrates to which biologically active proteins can be covalently coupled so that the resultant product has the biological properties of the protein and the mechanical properties of the substrate, for example, magnetic properties of a metal...     

A magnetic recording medium having finely divided magnetic metal oxide particles dispersed in a thermosetting resin binder and a thickness of no greater than 5 microns is provided. The thermosetting resin binder comprises: (a) 30 to 95 wt.% of a copolymer of 25 to 65 wt.% of alkyl acrylate or alkyl methacrylate,...     

This invention relates to a magnetic recording substance comprising a support and a magnetic layer containing a ferromagnetic metal powder of liquid phase reduction type in a binder, the ferromagnetic metal powder being obtained by mixing an aqueous slurry containing the ferromagnetic metal powder with...     

A coating composition for use in the preparation of magnetic recording media is described. The composition contains finely divided magnetic particles dispersed in an organic solvent, containing in solution a hydroxyl group containing polymer having an OH number between about 100-500, a polyether urethane...     

A process is described for clarification of an aqueous liquid by imparting magnetic characteristics to flocculated particles by addition of a ferromagnetic organic composition to the liquid to associate the ferromagnetic composition with the flocculated particles.

A method for nondestructive magnetic particle inspection of an object or part, especially parts having complex configurations, for detection of defects and metallurgical conditions therein, by placing a novel magnetic recording medium in the form of a magnetizable preferably putty-like material on the...     

A magnetic recording member comprising a non-magnetic support having thereon a magnetic layer of a ferromagnetic powder dispersed in a binder, wherein the magnetic layer contains an organic silicone compound represented by the formula (I): ##STR1## wherein R and R', which may be the same or different,...     

Method of transporting iron ore by forming an aqueous slurry containing by volume 20 to 45 percent iron ore; from 0.02 to 0.4 percent by weight based on iron ore in the slurry of a dispersant; and from 0.01 to 0.2 percent by weight based on water in the slurry of an organic polymer and moving the slurry...     

A magnetic recording medium is prepared by preparing a nitrocellulose-based magnetic composition by kneading a magnetic powder with a mixture of nitrocellulose in a solvent system containing isopropyl alcohol and blending the kneaded mixture with a polyurethane containing unreacted isocyanate groups;...     

Electrostatographic carrier materials having low bulk densities and high magnetic permeabilities are obtained by providing an alumino-boro-silicate glass particle containing from between about 10 to about 15 molar percent Fe.sub.2 O.sub.3 in which superparamagnetic ferrite crystallites having an average...     

In a magnetic recording substance comprising a non-magnetic support and a magnetic recording layer provided on the support, carbon black having a surface area of at least 700 m.sup.2 /g and an oil absorption of at least 300 ml (DBP)/100 g is contained in the magnetic layer thereby lowering the surface...     

An insulating magnetic toner useful as a one component developer for electro-photography consisting essentially of a ferro-magnetic material, a resin and a charge controlling agent. The preferred toner mixture has an average particle size in the range from about 7 to about 30 .mu.m and is substantially...     

In a magnetic recording substance comprising a non-magnetic support member and a magnetic recording layer provided thereon and consisting essentially of a ferromagnetic powder and a binder, the content of calcium component contained in the ferromagnetic powder is previously adjusted to 0.001% by weight...     

A magnetic recording medium having a high ratio of the residual magnetization (Br) to the saturation magnetization (Bm) and decreased voids, which has a magnetizable layer of magnetic particles which are dispersed in a binder: a polyester or polyurethane having a metal sulfonate group of 10 to 1,000...     

In a magnetic recording member comprising a non-magnetic support having provided thereon a magnetic layer comprising finely divided ferromagnetic powders dispersed in a binder, in which the binder comprises about 10 to about 70 wt% of (a) a polyester-polyurethane resin and about 30 to about 90 wt% of...     

A method of coating pigment particles such as magnetite with a derivative of a maleic anhydride. The magnetite pigments coated by this process are found to be particularly suitable for use in formation of magnetic toners that will both develop inductively and transfer electrostatically.

Magnetically responsive composite microparticles comprising (i) a magnetically responsive material and (ii) a porous solid water-insoluble matrix selected from proteinaceous materials, polysaccharides and mixtures thereof; wherein said magnetically responsive material is dispersed throughout said permeable,...     

A magnetic recording medium is formed of a non-magnetic base and a magnetic layer coated thereon and which contains magnetizable particles dispersed in resinous binder and, as a lubricating agent, a 2-ethylhexanoic acid ester of a saturated alcohol having 12 to 20 carbon atoms.

The invention contemplates an iron-based magnetodielectric material comprising a thermoreactive binder in the form of modified and non-modified phenol formaldehyde resins, and a filler in the form of a fibrous filler preliminarily impregnated with said resins, the components being used in the following...     

A magnetic recording medium comprising a non-magnetic support having thereon a magnetic recording layer containing a finely divided ferromagnetic powder, a binder and at least one 1,2-epoxyalkane represented by the general formula (I) ##STR1## wherein R represents an alkyl group having 10 to 30 carbon...     

A magnetic recording composition which comprises a magnetic powder, a resinous binder, and triolein or a mixture of triolein and hexyl laurate as a lubricant. When used singly, triolein is used in an amount of 0.5 to 10 wt % of the binder. When used in combination, on the other hand, the total amount...     

Ferrite particles having a plurality of distinct Curie temperatures are encapsulated within a polymer matrix to provide tagging material especially useful in identifying explosive materials even after detonation. In one embodiment, phosphor is dispersed within the polymer matrix to facilitate collection...     

This invention relates to a magnetic recording medium having on a non-magnetic support a magnetic layer comprising a ferromagnetic powder dispersed in a binder, in which the magnetic layer contains a compound represented by the following general formula (I), ##STR1## wherein R represents a residual radical...     

Magnetic adsorbent composite composed of a magnetic substrate particle which is non-reactive under conditions of use and which is encapsulated with adherent activated carbon.

Pressure sensitive image transfer media in the form of a thin film substance having a thin layer thereon comprising the solvent evaporated residue of a liquid mixture made up of substantially equal amounts of ethyl hydroxyl ethyl cellulose and a second resin incompatible therewith in association with...     

A magnetic recording medium improved in durability which comprises a substrate and a magnetic layer of about 1.0 to 10.mu. in thickness comprising magnetic particles and a binder and being formed on the substrate, characterized in that the magnetic layer further comprises (a) a liquid hydrocarbon having...     

A reactor comprising an annular iron core constituting a closed magnetic path and a conductor wound on the iron core. The iron core is formed of particles of iron or an iron-based magnetic material. Each particle is covered with an insulative oxide film which contains 0.3 to 0.8% of oxygen by weight...     

A magnetic recording medium comprises a substrate coated with a magnetic coating composition comprising nitrocellulose impregnated with a vinyl chloride-vinyl acetate-vinyl alcohol copolymer having a content of vinyl alcohol component of 8 wt. % or more, a magnetic powder, a solvent, and a thermal crosslinking...     

A composition of magnetic recording media consisting of a ferromagnetic powder such as .gamma.-Fe.sub.2 O.sub.3, a binder and single crystal alumina as a reinforcing agent. Single crystal .alpha.-alumina is preferably used as said single crystal alumina and its amount is preferably from 1 to 20% by weight...     

A magnetic material for magnetic recording media, comprising acicular particles of a conventional magnetic material and a ferrite powder amounting to about 0.5-20 Wt% of the acicular particles. Preferably the ferrite powder has a roundish particle shape. The use of this magnetic material in the form...     

The intravascularly-administrable, magnetically localizable biodegradable carrier comprises microspheres formed from an amino acid polymer matrix with magnetic particles embedded therein. The microspheres can be used for intraarterial administration and capillary level localization and/or release of...     

A magnetic recording composition comprising, in solvent, a magnetic powder, a resinous binder and, as a lubricant, an ester of isostearyl alcohol and a monobasic fatty acid containing from 6 to 16 carbon atoms or cetyl isooctanoate contained in an amount of 0.5 to 20 wt % of the binder. The composition...     

A flowable, pressure-fixable, magnetic, dry toner powder comprising from about 25 to about 70 percent by weight of a binder material, said binder material comprising a mixture of a polystyrene and a polyolefin/vinyl acetate copolymer, from about 30 to about 75 percent by weight of a magnetically permeable...     

An aqueous coating composition for forming a magnetic tape which has good adhesion for polyethylene terephthalate substrate. The composition is a stable dispersion in water of urethane with carboxylic acid groups in the backbone chain and includes a polyfunctional cross-linking agent.

A process for the manufacture of magnetic recording media by dispersing a mixture of particulate anisotropic magnetic material and additives in a solution of a polymeric binder in an organic solvent, compressing and then releasing the pressure on the dispersion, thereafter applying a layer of the dispersion...     

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 least 30 degrees Fahrenheit up to a maximum temperature of 390 degrees Fahrenheit. Toners having melt fusing...     

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.degree. C. as a pulverization promoter, annealing at an elevated temperature, and dispersing in a flexible, nonmagnetic matrix.

Disclosed is a composite magnetic developer which consists essentially of a homogeneous intimate mixture comprising a plurality of electrically insulating magnetic particulate developers comprising a binder medium and a finely divided magnetic material dispersed in the binder medium, in which the difference...     

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 represented by the formula Sm.sub.2 (Co Cu Fe M).sub.17 wherein M is at least one element selected from...     

A magnetic recording medium comprises a substrate coated with a magnetic layer wherein a magnetic powder is orientated in a binder and a polyoxyethylenesorbitane higher fatty acid ester surfactant.

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 surface of the body portion. The particles may be formed by a variety of methods. The body portion may...     

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 magnetic coating composition further comprises a dialkylsulfosuccinate.

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.degree. C. to a coercive force at 25.degree. C., less than 1.0 wt. % of a content of Fe.sup.2+ is prepared by incorporating a magnetic powder obtained by dispersing acicular...     

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 fatty acid wherein the oxidation resistance of the metallic magnetic particles is highly improved and the...     

A magnetic recording medium having improved electromagnetic conversion characteristics and physical properties prepared by using a three-component binder consisting of a polyurethane resin, a phenoxy resin and a vinyl chloride-vinylidene chloride resin.

Electrographic carrier particles with improved conductivity and stability are prepared from magnetic stainless steel particles of at least 9 weight percent chromium content. The particles are passivated by reaction with nitric acid. This forms a chromium-rich, stable film on the particle surfaces. Before...     

Magnetic recording media comprising a non-magnetic base and, applied thereto, one or more magnetizable layers based on an anisotropic magnetic material finely dispersed in an organic binder containing an ionomeric polyurethane elastomer, wherein the binder used is a substantially aqueous polyurethane...     

A magnetic recording medium consisting of a base coated with a magnetic coating material, characterized in that the binder composition in said magnetic coating material is ternary, consisting of from 30 to 70% of a polyurethane resin having an --OH group in the terminal position, from 10 to 50% of an...     

A recording medium and, more particularly, a recording medium based on a composition exhibiting high dispersibility for finely-divided ferromagnetic powders having excellent abrasion resistance is disclosed in which the magnetic composition comprises a finely-divided ferromagnetic powders dispersed in...     

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 excellent abrasion resistance is disclosed wherein the binder for the magnetic composition contains a 2-chloroacrylonitrile...     

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 resin as binder, characterized by the addition of a vinyl chloride-vinyl acetate copolymer containing at least...     

A magnetic recording medium comprises a substrate coated with a magnetic layer comprising a magnetic powder and a binder comprising an urethane resin or a polyester and a vinyl chloride type copolymer of vinyl chloride-vinyl acetate-vinyl alcohol copolymer, vinyl chloride-vinyl acetate-maleic acid copolymer...     

A magnetic recording medium is provided which satisfies electromagnetic conversion characteristics and typical physical properties such as bonding strength, repeated-passage stability, still-playback characteristics, etc. without unfavorably affecting the surface smoothness. The binder in the magnetic...     

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 finely divided ferromagnetic substance dispersed in the resinous binding agent. The binding agent consists...     

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 binders and .alpha.-Fe.sub.2 O.sub.3 particles, whereby the dispersibility of the magnetic particles in...     

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 cobalt-containing iron oxide magnetic particles consisting essentially of ferromagnetic iron oxide particles containing...     

A magnetic recording medium has a substrate coated with a magnetic powder and a binder. The binder in said magnetic layer essentially consists of 15 to 45 wt. % of a polyester resin, 20 to 50 wt. % of an epoxy resin and 10 to 40 wt. % of nitrocellulose.

A magnetic recording medium having a layer containing as a lubricant one or more organo-polysiloxane compounds having the following formula (I): ##STR1## (wherein each of A.sub.1 and A.sub.2 is independently --CH.sub.3, --CH.sub.2 --CH.sub.2 --(CF.sub.2).sub.q --CF.sub.3 or --R.sub.1 OCOR.sub.2 ; R.sub.1...     

A urethane resin comprising the reaction product of a C.sub.4 -C.sub.8 alkylenediisocyanate as an isocyanate component and a C.sub.3 -C.sub.12 alkyleneglycol as a polyol component is used as a rubber component for a binder in a magnetic layer of a magnetic recording medium.

A magnetic recording medium having a substrate coated with a magnetic layer comprising a magnetic powder and a binder essentially consisting of 20 to 70 wt. % of a polyester resin, 80 to 30 wt. % of a vinyl chloride-vinylidene chloride copolymer and a polyisocyanate.

A magnetic recording medium having a substrate coated with a magnetic layer comprises a binder, a magnetic powder and a metal phosphide at a ratio of 0.2 to 5.0 wt. % based on said magnetic powder.

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 formed of a composition which will produce the desired magnetic metallic particles, immersing the electrodes...     

A magnetic recording medium comprises a substrate coated with a magnetic powder composition comprising a magnetic powder and an organic binder having a main component of vinyl chloride-vinyl alcohol copolymer.

In a magnetic recording medium having a substrate coated with a magnetic layer comprising a magnetic powder and a binder, an improvement characterized in that said binder in said magnetic layer essentially consisting of 20 to 60 wt. % of a polyurethane, 15 to 45 wt. % of a polyester resin and 20 to 50...     

A magnetic recording tape or disc which has excellent total characteristics of an adhesive strength, a repeat running durability, an electromagnetic characteristic, a gloss degree of the surface and a curling is provided. A binder of a magnetic layer comprises 40 to 70 wt. % of a urethane resin, 15 to...     

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 having a pigment volume concentration of up to 35.

A magnetic recording medium comprises a substrate coated with a magnetic layer comprising a magnetic powder and a first non-magnetic powder of Al.sub.2 O.sub.3 and/or Cr.sub.2 O.sub.3 at a ratio of 0.5 to 15 wt. % based on said magnetic powder; a second non-magnetic powder of TiO.sub.2, SiC, SiO.sub.2,...     

A magnetic recording medium comprises a substrate coated with a magnetic layer comprising a magnetic powder and a binder comprising an urethane resin and a vinyl chloride-vinyl acetate-maleic acid copolymer having a content of maleic acid component of at least 1.5%.

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 magnetic pigment. The volumetric ratio of magnetic pigment to polyurethane in terms of solids content is in...     

A magnetic recording medium having a substrate coated with a magnetic layer comprises a magnetic powder and a binder, essentially consisting of 40 to 80 wt. % of a polyester resin, 60 to 20 wt. % of a nitrocellulose impregnated with vinyl chloride-vinyl acetate copolymer as a protective component and...     

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 magnetic ink composed of the fine magnetic particles dispersed in a dispersing medium in a colloidal state with...     

A magnetic recording medium containing a ferromagnetic powder, a binder and a lubricant is disclosed. The lubricant comprises (1) abrasive particles having a Mohs' hardness of about 6 or more and a particle size of about 5 microns or less and (2) an ester of an aliphatic acid having 20 to 26 carbon atoms...     

A magnetic recording medium is described comprising a first layer comprising a magnetic iron oxide powder dispersed in a binder formed on a nonmagnetic support, a second layer formed on the first layer comprising a ferromagnetic metal powder dispersed in a binder, and having a greater coercive force...     

A magnetic recording medium comprising a nonmagnetic flexible base and a magnetic recording layer formed thereon which is mainly composed of fine ferromagnetic particles and a binder. The binder contains both a vinyl chloride/vinyl acetate/vinyl alcohol copolymer and a vinyl chloride/vinylidene chloride...     

A magnetic recording medium is provided which has smooth and stable running performances and is free of "squeal" phenomenon, especially in an environment of high temperature and high humidity. A highly viscous silicone oil having a viscosity of 100,000 centistokes or more is incorporated in combination...     

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 or blocked polyisocyanates with polyacrylates which contain reactive hydrogens.

The present invention relates to an improved magnetic recording medium comprising a magnetic recording layer on the surface of a non-magnetic support, in which the magnetic recording layer contains a fatty acid, high viscosity silicone oil and fatty acid ester.

A magnetic wall covering composition consisting of magnetic iron oxide particles and glue.

Microspheres of acrolein homopolymers and co-polymer with hydrophillic comonomers such as methacrylic acid and/or hydroxyethylmethacrylate are prepared by cobalt gamma irradiation of dilute aqueous solutions of the monomers in presence of suspending agents, especially alkyl sulfates such as sodium dodecyl...     

A magnetic recording medium comprised of a nonmagnetic base and a magnetic coating layer thereon, said magnetic coating layer comprises ferromagnetic particles dispersed in a binder vehicle, characterized in that said magnetic coating layer contains a glyceride and a sorbitan ester of fatty acid.

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 formed of a composition which will produce the desired magnetic metallic particles, immersing the electrodes...     

A magnetic recording medium is provided which has smooth and stable running performances and is free of "squeal" phenomenon, especially in an environment of high temperature and high humidity. A highly viscous silicone oil having a viscosity of 100,000 centistokes or more is incorporated in combination...     

A magnetic recording medium is provided which has smooth and stable running performances and is free of "squeal" phenomenon, especially in an environment of high temperature and high humidity. A highly viscous silicone oil having a viscosity of 100,000 centistokes or more is incorporated in combination...     

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 wherein the solvent system has an initial Hansen three-dimensional solubility parameter range of approximately...     

A magnetic recording medium comprises a combination of two or more kinds of fine abrasive powders having different true specific gravities in a magnetic layer containing a magnetic powder.

A magnetic recording medium is composed of a base and a magnetic coating which comprises a binder and a magnetic powder dispersed therein. The magnetic powder, in turn, contains a nonmagnetic powder having an average particle size of not more than 2 .mu.m and a hardness of at least 6 on Mohs scale, in...