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    MAGNETIC RECORDING MEDIA
    5.
    发明专利
    MAGNETIC RECORDING MEDIA 未知

    公开(公告)号：CA1026168A

    公开(公告)日：1978-02-14

    申请号：CA197229

    申请日：1974-04-09

    Applicant: BASF AG

    Inventor： VAETH GUENTER ,  BACHMANN RUDOLF ,  SENKPIEL WERNER ,  HARTMANN HANS-JOERG ,  FALK ROLAND ,  MOTZ HERBERT

    IPC: C09D5/23 ,  G11B5/702

    Abstract: The invention relates to magnetic recording media comprising a non-magnetic base and, applied thereto, a firmly adhering magnetic coating based on a finely divided magnetic pigment and a special binder mixture. This binder mixture consists essentially of 20 to 90 percent by weight of an elastomeric polyurethane which is soluble in a volatile organic solvent, is practically free of isocyanate groups and has been obtained from a linear, aliphatic polyester or polyether and a diisocyanate of 6 to 24 carbon atoms, and of 10 to 80 percent by weight of a vinyl chloride copolymer which contains 50 to 90 percent by weight of vinyl chloride units and 10 to 50 percent by weight of units of one or more diesters of maleic acid with an alcohol of 1 to 3 carbon atoms, or of the reaction product of this binder mixture with a polyisocyanate of 6 to 50 carbon atoms. Magnetic coatings containing such a binder mixture are distinguished by improved surface hardness coupled with improved orientability of the magnetic particles, as a result of which such recording media are particularly suitable for modern video- and audio-recording instruments.

    Production of magnetizable metallic particles suitable for the production of magnetic recording media
    7.
    发明专利
    Production of magnetizable metallic particles suitable for the production of magnetic recording media 未知

    公开(公告)号：GB1125093A

    公开(公告)日：1968-08-28

    申请号：GB77766

    申请日：1966-01-07

    Applicant: BASF AG

    Inventor： HARTMANN HANS-JOERG ,  WINTERSBERGER KARL

    IPC: B22F9/22 ,  C04B35/26 ,  C22C1/02 ,  G11B5/64 ,  G11B5/706 ,  H01F1/06

    Abstract: 1,125,093. Cobalt ferrite. BADISCHE ANILIN- & SODA-FABRIK. A.G. 7 Jan., 1966 [9 Jan., 1965], No. 777/66. Heading C1A. [Also in Divisions C7 and H1] Cobalt ferrite is produced by adding to a solution containing a Co II salt and an Fe III salt (with an atomic ratio of Co II : Fe III of 0À8 : 2 to 1À8 : 2) a caustic alkali solution in such an amount that the pH reaches at least 12À8, heating the resultant precipitate to above 50‹ C., and separating and drying the precipitate. Up to 80% of the Co II salt may be replaced by Fe II salt. The caustic alkali may be added to Fe III salt solution alone, the Co II salt being added when the neutral point has been reached. The caustic alkali is preferably added in stages and preneutralisation with ammonia may be employed.

    MAGNETOGRAM LAYER CARRIER AND METHOD OF MANUFACTURING THEREOF
    9.
    发明专利
    MAGNETOGRAM LAYER CARRIER AND METHOD OF MANUFACTURING THEREOF 未知

    公开(公告)号：CS180630B2

    公开(公告)日：1978-01-31

    申请号：CS261974

    申请日：1974-04-11

    Applicant: BASF AG

    Inventor： VAETH GUENTER ,  BACHMANN RUDOLF ,  SENKPIEL WERNER ,  HARTMANN HANS-JOERG ,  FALK ROLAND ,  MOTZ HERBERT

    IPC: C09D5/23 ,  G11B5/702 ,  G11B5/62

    Abstract: The invention relates to magnetic recording media comprising a non-magnetic base and, applied thereto, a firmly adhering magnetic coating based on a finely divided magnetic pigment and a special binder mixture. This binder mixture consists essentially of 20 to 90 percent by weight of an elastomeric polyurethane which is soluble in a volatile organic solvent, is practically free of isocyanate groups and has been obtained from a linear, aliphatic polyester or polyether and a diisocyanate of 6 to 24 carbon atoms, and of 10 to 80 percent by weight of a vinyl chloride copolymer which contains 50 to 90 percent by weight of vinyl chloride units and 10 to 50 percent by weight of units of one or more diesters of maleic acid with an alcohol of 1 to 3 carbon atoms, or of the reaction product of this binder mixture with a polyisocyanate of 6 to 50 carbon atoms. Magnetic coatings containing such a binder mixture are distinguished by improved surface hardness coupled with improved orientability of the magnetic particles, as a result of which such recording media are particularly suitable for modern video- and audio-recording instruments.

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