Abstract: By inclusion of a fluorinated graphite material in conjunction with carbon black in the magnetic layer of a magnetic recording medium, the medium is improved significantly in its surface properties and electromagnetic performance properties as well as magnetic characteristics.

Abstract: By inclusion of a fluorinated graphite material in conjunction with a silicone oil in the magnetic layer of a magnetic recording medium, the medium is improved significantly in its smooth-running properties and electromagnetic performance properties.

Abstract: A sintered high vanadium high speed steel with an excellent hardness and ductility of composition C 1.4-6.2%, W+2 Mo (W-equivalent) 10.0-24.0%, Cr 3.0-6.0%, V 8.5-28%, Co less than 17%, the remainder Fe and inevitable impurities, and a method of producing same.It can be produced by the steps of commingling the alloy constituents in the form of pulverulent oxides and carbon powder, heating the mixture in a stream of hydrogen, thereby reducing the mixture by the carbon and hydrogen simultaneously to yield an alloy powder, adjusting the composition and the grain size of the obtained alloy powder, pressing the alloy powder to a compact, sintered the compact in a vacuum, and finally converting the matrix of the sintered body into martensite by heat treatment.

Abstract: A carrier for use as a component in electrophotographic two-component developers which is improved in durability of the triboelectric property by coating the surface of the iron core particles of carrier with a resinous composition comprised essentially of an epoxy-hydroxy hydrocarbon resin and an acrylic resin.

Abstract: Ferromagnetic Fe-Ni alloy powders having the combination of a coercive force of 550-900 Oe (oersted) and a saturation flux density of 90-170 emu/g are provided by applying a nickel compound in a liquid to a particulate, oxygen-containing iron compound having an average particle length of 0.5-5 .mu.m and an average particle width of 0.02-0.5 .mu.m, and then drying and reducing the treated material to produce a metallic powder. The ferromagnetic powders are suitable for production of magnetic recording media because of the balanced magnetic properties.

Abstract: A carrier for use as a component in electrophotographic two-component developers which is improved in durability of the triboelectric property by coating the surface of the iron core particles of carrier with a resinous composition comprised essentially of an epoxy-hydroxy hydrocarbon resin and a silicone resin.

Abstract: Acicular magnetic powder consisting essentially of acicular iron particles which have a high coercive force and a high saturation flux density. These particles are doped and additionally contain at least one metal selected from the group consisting of cobalt, nickel, manganese and antimony and are produced in accordance with a process which provides finely divided acicular iron particle products.

Abstract: The magnetic characteristics of magnetic powder consisting mainly of iron are improved by pre-treating the starting material from which the magnetic powder is prepared by reduction, with an aqueous solution and/or suspension of one member selected from the group consisting of cobalt, nickel, manganese and antimony compounds and mixtures thereof.

Abstract: The magnetic characteristics of magnetic powder consisting mainly of iron are improved by pre-treating the starting material from which the magnetic powder is prepared by reductions, with an aqueous solution and/or suspension of one member selected from the group consisting of zinc, chromium and copper compounds and mixtures thereof.

Abstract: The magnetic characteristics of magnetic powder consisting mainly of iron are improved by pre-treating the starting material from which the magnetic powder is prepared by reduction, with an aqueous solution and/or suspension of one member selected from the group consisting of cobalt, nickel, manganese and antimony compounds and mixtures thereof.

Abstract: The magnetic characteristics of magnetic powder consisting mainly of iron are improved by pre-treating the starting material from which the magnetic powder is prepared by reductions, with an aqueous solution and/or suspension of one member selected from the group consisting of zinc, chromium and copper compounds and mixtures thereof.

Abstract: A vinylidene chloride copolymer is provided which can give packaging articles such as films, sheets, containers and tubes having superior appearance, heat stability and gas-barrier property and sufficient strength for practical application. The vinylidene chloride copolymer is derived from (1) 70 to 95% by weight of vinylidene chloride, (2) 0.5 to 10% by weight of glycidyl methacrylate, (3) 0.05 to 3% by weight of methyl acrylate or methyl methacrylate, and (4) 5 to 25% by weight of another copolymerizable vinyl monomer.

Abstract: A significant improvement in thermal stability and decreased gas permeability and water vapor transmission of vinylidene chloride copolymer resin are achieved by the presence of about 0.5 -- about 10% by weight of glycidyl methacrylate as an internal heat stabilizer in the polymer chain.