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    FACETTED NODULAR PARTICLES, THEIR PREPARATION AND USE
    1.
    发明申请
    FACETTED NODULAR PARTICLES, THEIR PREPARATION AND USE 审中-公开
    无定形颗粒，其制备和使用

    公开(公告)号：WO1986005026A1

    公开(公告)日：1986-08-28

    申请号：PCT/EP1986000052

    申请日：1986-02-01

    Applicant: KODAK-PATHE ,  EASTMAN KODAK COMPANY ,  PINGAUD, Bernard, Jean

    Inventor： KODAK-PATHE ,  EASTMAN KODAK COMPANY

    IPC: G11B05/706

    CPC classification number: G11B5/70615 ,  G11B5/70642 ,  G11B5/70652 ,  G11B5/70663 ,  G11B5/70668

    Abstract: Very small iron-containing particles that are in the shape of facetted nodules. Such particles can be non-magnetic particles such as delta ferric oxide hydrate particles or magnetic particles such as magnetic iron oxide particles or metallic particles. Magnetic layers containing such magnetic particles combine excellent remanent magnetization with increased output signal level. The facetted nodular particles are prepared in a process in which (a) an aqueous solution of ferrous salt is added to an aqueous solution of alkaline hydroxide while avoiding substantial local excesses of the ferrous salt, and subjecting the ferrous salt solution to reducing conditions before or during its addition to the alkaline hydroxide solution and (b) the ferrous hydroxide particles are oxidized to delta ferric oxide hydrate particles in the presence of an iron complexing agent, for example, pyrogallol, that is capable of selectively forming ferric iron complexes that are soluble in the reaction medium. The use of the iron complexing agent in this process provides delta ferric oxide particles rather than alpha ferric oxide particles which are normally obtained in processes of this type. The delta ferric oxide hydrate particles are converted to facetted nodular magnetic particles by appropriate heat treatments.

    PROCESS FOR THE PRODUCTION OF HEXAGONAL BARIUM FERRITE POWDER, AND POWDER PRODUCED BY THIS PROCESS
    3.
    发明申请
    PROCESS FOR THE PRODUCTION OF HEXAGONAL BARIUM FERRITE POWDER, AND POWDER PRODUCED BY THIS PROCESS 审中-公开
    生产六角棒状粉末粉末的方法和本方法生产的粉末

    公开(公告)号：WO1992013341A1

    公开(公告)日：1992-08-06

    申请号：PCT/DE1991000049

    申请日：1991-01-21

    Applicant: PHYSIKALISCH-TECHNISCHES INSTITUT ,  GÖRNERT, Peter ,  JURISCH, Manfred ,  PFEIFFER, Rolf-Gerd ,  REIN, Horst ,  RÖSLER, Michael ,  SCHUBERT, Thomas ,  SCHÜPPEL, Walter ,  SIEGEL, Hans ,  SINN, Ekkehard ,  WENDT, Michael

    Inventor： PHYSIKALISCH-TECHNISCHES INSTITUT

    IPC: G11B05/706

    CPC classification number: G11B5/70678

    Abstract: Hexagonal barium ferrite powders are used in the production of high-density magnetic data-recording media. The aim of the invention is to obtain, using ceramic glass manufacturing methods, an M-type hexagonal barium ferrite powder suitable for magnetic recording media. This aim is achieved by selecting the melt proportions so that, in the MeO/B2O3/MeFe12-2xR xR xO19 ternary phase diagram, hexagonal ferrite (BaFe12-2xCoxTixO19) is dissolved in the basic glass at a molar concentration of 0.05 to 0.08, the ratio of basic oxide to acidic oxide (BaO to B2O3) falling between 1.00 and 1.22 and the ratio of silicon dioxide to boron trioxide, calculated as (SiO2)/(SiO2) + (B2O3), falling between 0.007 and 0.15.

    Abstract translation: 六角钡铁氧体粉末用于生产高密度磁数据记录介质。 本发明的目的是获得使用陶瓷玻璃制造方法的适用于磁记录介质的M型六方钡铁氧体粉末。 该目的通过选择熔体比例来实现，使得在MeO / B 2 O 3 / MeFe 12-2 x R x X x X x Y 19三元相图中，将六方晶系铁氧体（BaFe12-2xCoxTixO19）以摩尔浓度溶解在碱性玻璃中 为0.05〜0.08，以（SiO2）/（SiO2）+（B2O3）计算，碱性氧化物与酸性氧化物（BaO〜B2O3）的比例在1.00〜1.22之间，二氧化硅与三氧化硼的比例为0.007 和0.15。

    HEXAFERRITE MATERIALS
    5.
    发明申请
    HEXAFERRITE MATERIALS 审中-公开
    六方石材

    公开(公告)号：WO1996017343A1

    公开(公告)日：1996-06-06

    申请号：PCT/GB1995002758

    申请日：1995-11-24

    Applicant: THE UNIVERSITY OF BIRMINGHAM ,  ATAIE, Abolghasem ,  HARRIS, Ivor, Rex ,  PONTON, Clive, Brian

    Inventor： THE UNIVERSITY OF BIRMINGHAM

    IPC: G11B05/706

    CPC classification number: G11B5/70678

    Abstract: Barium, strontium and/or rare earth metal hexaferrite powder of low coercivity can be produced by subjecting a barium, strontium and/or rare earth metal hexaferrite powder to carburising, nitriding, carbonitriding, hydriding or carbohydriding conditions without undue loss of saturation magnetisation. High coercivity powder can be produced by calcining the low coercivity powder (fig. 1). High remanence and high saturation magnetisation powder can be produced by mechanically alloying of a Sr-, Ba and/or rare earth metal hexaferrite powder with iron powder (fig. 12).

    Abstract translation: 可以通过使钡，锶和/或稀土金属六铁氧体粉末渗碳，氮化，碳氮共渗，氢化或碳水化合物条件，而不会导致饱和磁化的过度损失来制备低矫顽力的钡，锶和/或稀土金属六铁酸盐粉末。 通过煅烧低矫顽力粉末可以生产高矫顽力粉末（图1）。 可以通过Sr，Ba和/或稀土金属六铁粉与铁粉的机械合金化来制造高剩磁和高饱和磁化粉末（图12）。

    Magnetic recording medium and method of manufacturing the same
    8.
    发明公开
    Magnetic recording medium and method of manufacturing the same 失效
    磁记录介质及其制造方法

    公开(公告)号：EP0249216A3

    公开(公告)日：1988-11-23

    申请号：EP87108391

    申请日：1987-06-10

    Applicant: KABUSHIKI KAISHA TOSHIBA

    Inventor： Morita, Hiroshi c/o Patent Division ,  Osada, Osamu c/o Patent Division

    IPC: G11B05/71 ,  G11B05/72 ,  G11B05/706 ,  G11B05/84

    CPC classification number: G11B5/725 ,  G11B5/84 ,  Y10S428/90 ,  Y10T428/265

    Abstract: A magnetic recording medium comprises a non-magnetic substrate (21), a magnetic recording layer (22) formed on the non-magnetic substrate (21), and a lubricant layer (23) containing carbon as a major component and formed on the magnetic recording layer (22). At least one element selected from a group consisting of hydrogen and a halogen is bonded to the carbon, as the major component of the lubricant layer (23), in a surface region of the lubricant layer (23). In the formation of the lubricant layer (23), initially only an inert gas is introduced as an atmospheric gas around a carbon target at the begining of sputtering, so that the carbon target is sputtered by cations of the inert gas. Thereafter, a gas containing at least one of hydrogen and a halogen is added to sputter the carbon target. Thus, a carbon-hydrogen atomic bond (C-H bond) and/or a carbon- halogen atomic bond (C-X bond; X is a halogen element) are formed on the surface region of the lubricant layer (23).

    Dropout-free magnetic printing plate
    10.
    发明公开
    Dropout-free magnetic printing plate 失效
    无压力磁性印刷板

    公开(公告)号：EP0177941A3

    公开(公告)日：1988-11-09

    申请号：EP85112765

    申请日：1985-10-08

    Applicant: E.I. DU PONT DE NEMOURS AND COMPANY

    Inventor： Marcus, Sanford Morton

    IPC: G03G19/00 ,  G11B05/845 ,  G11B05/852 ,  G11B05/706

    CPC classification number: G11B5/845 ,  G03G19/00 ,  G11B5/70636 ,  G11B5/852

    Abstract: A magnetic printing master prepared by:
    1. coating a layer on a flexible support sheet; 2. prestructuring the coating in a periodic manner, and 3. laminating the CrO 2 -coated sheet onto a second adhesive-coated, support sheet, such as 3-7 mil polyester. The resulting film may be imaged by selective demagnetization and toned. Known transfer technology may then be used to provide a printing plate.

    Abstract translation: 一种磁性印刷母版，其制备方法如下：1.在柔性支撑片上涂层; 2.周期性地预涂涂层，以及3.将CrO 2涂覆的片材层压到第二粘合剂涂覆的支撑片材上，例如3-7密耳聚酯。 所得到的膜可以通过选择性去磁成色并调色。 然后可以使用已知的转印技术来提供印刷版。

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