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    MAGNETIC RECORDING CARRIER
    2.
    发明专利
    MAGNETIC RECORDING CARRIER 失效

    公开(公告)号：JPH0386917A

    公开(公告)日：1991-04-11

    申请号：JP21913790

    申请日：1990-08-22

    Applicant: BASF AG

    Inventor： MANFUREETO OORINGAA ,  IEENE KOFUAKUSU

    IPC: C09D5/23 ,  C09D7/12 ,  G11B5/706

    Abstract: PURPOSE: To make it possible to assure a high-quality image and voice quality with respect to blocking and head wear at the time of tape/head contact by composing a magnetic recording carrier of a nonmagnetic carrier material and a magnetizable specific layer applied thereon. CONSTITUTION: This magnetic recording carrier is composed of the nonmagnetic carrier material and the magnetizable material which is applied thereon and intrinsically consists of a magnetic material selected from a group consisting of iron oxide (III) reformed with cobalt and hexagonal ferrite finely dispersed into an org. binder and an inorg. supplying material. Acicular ferromagnetic chromium dioxide having intensity of a coercive magnetic field of over 24kA/m and a specific surface area of 20 to 60m /g is incorporated as the inorg. supplying material at a ratio of 10 to 20% of the magnetic material into the magnetized layer. As a result, the magnet layer is highly homogeneous and smooth and the blocking does not arise at the time of a recording carrier operation. The use of the finely dispersed iron oxide (III) reformed with the cobalt is made usable and the degradation in quality or layer homogeneity does not arise any more.

    MANUFACTURE OF HIGH MAGNETIC CHROMIUM DIOXIDE
    10.
    发明专利
    MANUFACTURE OF HIGH MAGNETIC CHROMIUM DIOXIDE 失效

    公开(公告)号：JPS5663824A

    公开(公告)日：1981-05-30

    申请号：JP14585280

    申请日：1980-10-20

    Applicant: BASF AG

    Inventor： MANFUREETO OORINGAA ,  GIYUNTAA FUEETO ,  NORUBAATO MIYURAA ,  OIGEN BUETOSHIYUTAIN

    IPC: C01G37/00 ,  C01G37/027 ,  G11B5/62 ,  G11B5/706 ,  H01F1/11

    Abstract: A process for the manufacture of ferromagnetic chromium dioxide modified with foreign elements, by reacting oxides of trivalent and hexavalent chromium under superatmospheric pressure at an elevated temperature in the presence of water and of antimony(III) oxide as modifier, with or without other modifiers in an amount not exceeding 15% by weight, wherein the antimony(III) oxide employed as modifier is, to the extent of more than one-third, present as the senarmontite cubic modification, has a specific surface area, measured by the BET method, of from 1.5 to 15 m2/g, and is added in a total amount of up to 0.5% by weight, based on the resulting chromium dioxide.

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