Abstract: A magnetic recording medium has a magnetic film formed on the surface of a substrate and a protective film further formed on the surface of the magnetic film. The protective film is composed of a first layer containing at least one substance selected from the group consisting of Cr.sub.2 O.sub.3, Si, and Ge and a second layer of amorphous carbon or graphite containing amorphous carbon deposited on the front side of the first layer.

Abstract: A manufacturing process of Co-Ni magnetic recording media by sputtering Co-Ni thin film layer on a substrate in Argon atomsphere including nitrogen and heating the thin film to evaporate nitrogen from the thin film to prepare the magnetic recording media appropriate for high density longitudinal recording, wherein on sputtering the substrate is maintained at a temperature of room temperature to 300.degree. C.

Abstract: The present invention provides a fibrous product of apatite comprising one or more apatites selected from a group of apatites represented by the general formula:M.sub.10 (ZO.sub.4).sub.6 X.sub.2wherein M represents Ca, Ba, Mg, Sr, Pb, Cd, Fe and the like, ZO.sub.4 represents PO.sub.4, AsO.sub.4, VO.sub.4, CO.sub.3 and the like, and X represents F, Cl, OH and the like. This fibrous product of apatite has many applications such as uses for medical treatment, large scale microorganism cultivating media and others, and particularly it is useful as apatite implant materials having a good compatibility with living organism and superior workability.A fibrous apatite product of this invention may be produced by a method comprising the steps of:(a) preparing a dispersion of apatite by dispersing fine apatite particles uniformly in a solution of binder in water, said apatite being one or more apatites selected from a group of apatites represented by the general formula:M.sub.10 (ZO.sub.4).sub.6 X.sub.

Abstract: A manufacturing process of Co-Ni magnetic recording media by sputtering Co-Ni thin film layer on a substrate in Argon atmosphere including oxygen or air and heating the thin film to evaporate oxygen or air from the layer to prepare the magnetic recording media appropriate for high density longitudinal recording, wherein on sputtering the substrate is maintained at a temperature of room temperature to 300.degree. C.

Abstract: A process for producing purified diammonium phosphate (abbreviated to DAP) directly from wet process phosphoric acid with a high yield is provided, which process comprises reacting wet process phosphoric acid with NH.sub.3 at 50.degree..about.80.degree. C. while keeping the molar ratio of NH.sub.3 /H.sub.3 PO.sub.4 at 1.65-1.90; separating the resulting slurry containing DAP crystals and an insoluble sludge into a slurry containing the former and a slurry containing the latter; treating the former slurry in a conventional manner to recover DAP; while treating the latter slurry by heating it to 60.degree..about.95.degree. C. to dissolve DAP contained therein, removing the sludge by centrifugal separation and concentrating the filtrate to recover DAP; and combining the two portions of DAP.

Abstract: A process for producing purified monoammonium phosphate (abbreviated to MAP) directly from wet process phosphoric acid with a high yield is provided, which process comprises reacting wet process phosphoric acid with NH.sub.3 at 50.degree..about.80.degree. C. while keeping the molar ratio of NH.sub.3 /H.sub.3 PO.sub.4 at 0.9.about.1.35; separating the resulting slurry containing MAP crystals and an insoluble sludge into a slurry containing the former and a slurry containing the latter; treating the former slurry in a conventional manner to recover MAP; while treating the latter slurry by heating it to 60.degree..about.95.degree. C. to dissolve MAP contained therein, removing the sludge by centrifugal separation and concentrating the filtrate to recover MAP; and combining the two portions of MAP.

Abstract: A process and apparatus are provided for the production of a non-woven fabric by melt-blowing wherein one or more yarns, e.g. monofilaments, are added or charged into the fabric stream between the extruder and collector by means of a supporting and drawing pressure gas stream. In one embodiment means are provided to regulate flow of the gas stream. In another embodiment means are provided to reciprocate or to rotate through a small arc the one or more charging means.

Abstract: An artificial leather is made by impregnating a special nonwoven web substrate with an elastic polymer material. In another embodiment the substrate comprises a nonwoven fabric laminated to a woven or nonwoven fabric.

Abstract: A bulky nonwoven fabric comprises fine fibers forming thin intertwined layers extending between one surface of the fabric and the other surface, that is, the layered fibers run in the direction of thickness of the fabric. The nonwoven fabric of thermoplastic resin is prepared by a melt-blowing process utilizing a drum collector and cooperating nip-roll. If desired the fiber and gas stream may be contacted with fine liquid drops.

Abstract: A process for producing a thermoplastic nonwoven fabric having a uniform thickness and optionally napped fibers according to a melt blowing method, which comprises blowing a fiber stream consisting of melt blown fibers and a gas at a high speed onto a plate within a valley-like fiber-collecting zone formed by two plates having a large number of pores, to form a uniform nonwoven fabric without scattering fibers.

Abstract: In an improved die-nose assembly for a melt-blowing process wherein molten resin is extruded from a series of die-holes while heated gas is blown out through slots on either side of the die nose associated therewith, spacers which are movable widthwise of the die assembly are provided in the gas slots to provide effective uniformity in the gas streams across the width of the die.

Abstract: A process and apparatus are provided for the production of a non-woven fabric by melt-blowing wherein one or more yarns, e.g. monofilaments, are added or charged into the fabric stream between the extruder and collector by means of a supporting and drawing pressure gas stream. In one embodiment means are provided to regulate flow of the gas stream in another embodiment means are provided to reciprocate or to rotate through a small arc the one or more charging means.