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    3.
    发明专利
    未知

    公开(公告)号：DE2608022A1

    公开(公告)日：1977-09-08

    申请号：DE2608022

    申请日：1976-02-27

    Applicant: BASF AG

    Inventor： STECK WERNER DIPL CHEM DR ,  LOESER WERNER DIPL ING DR ,  STEUERWALD MANFRED ,  WUNSCH GERD DIPL CHEM DR ,  DEIGNER PAUL DR

    IPC: G11B5/64 ,  G11B5/72 ,  G11B5/84 ,  G11B5/858

    Abstract: A process for the manufacture of wear-resistant magnetic recording media comprising a dimensionally stable base, a thin ferromagnetic metal layer, containing cobalt and/or nickel, firmly bonded thereto and a thin protective layer applied thereon. The protective layer is produced by treating the recording medium in a liquid basic medium, containing gaseous oxygen, for from 1 to 60 minutes at from 5 DEG to 70 DEG C., washing and drying the treated recording medium and then heating it in air at from 170 DEG to 300 DEG C. This method offers a particularly simple way of providing the ferromagnetic layer of the recording medium with a thin but uniform, mechanically stable and wear-resistant protective layer.

    4.
    发明专利
    未知

    公开(公告)号：DE2364877A1

    公开(公告)日：1975-07-03

    申请号：DE2364877

    申请日：1973-12-28

    Applicant: BASF AG

    Inventor： GROSS EGON VON DIPL CHEM DR ,  STRITZINGER HEINZ DIPL ING ,  HARTMANN JOB-WERNER DIPL CHEM ,  STEUERWALD MANFRED ,  KLEIN URSULA ,  SCHAEFER DIETER DIPL CHEM DR

    IPC: C09D5/23 ,  G11B5/702 ,  G11B5/68

    Abstract: Magnetic recording media comprising a non-magnetizable flexible base and a firmly adhering magnetic coating based on a dispersion, containing a silane, of a magnetic pigment in a polymeric binder, and a process for their manufacture. The silane is an aminoalkylsilane RnSi(OR')4-n, wherein n is 1, 2 or 3, R' is alkyl of 1 to 8 carbon atoms and R is aminoalkyl of the formula with one or more primary and/or secondary amino groups and from 3 to 11 carbon atoms. Magnetic recording media comprising a magnetic coating containing such a silane exhibit better abrasion resistance and better electromagnetic properties than comparable coatings.

    5.
    发明专利
    未知

    公开(公告)号：DE2950174A1

    公开(公告)日：1981-06-19

    申请号：DE2950174

    申请日：1979-12-13

    Applicant: BASF AG

    Inventor： KOESTER EBERHARD DIPL PHYS DR ,  HACK JOACHIM DIPL ING ,  STEUERWALD MANFRED

    IPC: G06K19/10 ,  G06K7/08 ,  G06K19/12 ,  G07D7/04 ,  G11B5/00 ,  G11B23/30 ,  G07D7/00 ,  G06K19/08 ,  B44F1/12

    Abstract: A process for authenticating recording media which are to be safeguarded against falsification and which possess discrete regions of an exchange-anisotropic magnetic material, by comparison of the polarity of a residual magnetization which is left over, because of the exchange anisotropy of the magnetic material, from a predetermined initial magnetization after exposure of the material to a specific temperature cycle and, subsequently, to a magnetic AC field which decreases to zero, with the polarity of a residual magnetization formed in the same way from an opposite initial magnetization, and an apparatus for carrying out the said process.

    Production of Magnetic Recording Media.
    6.
    发明专利
    Production of Magnetic Recording Media. 未知

    公开(公告)号：GB1153453A

    公开(公告)日：1969-05-29

    申请号：GB4324766

    申请日：1966-09-28

    Applicant: BASF AG

    Inventor： SCHNELL GEORGE ,  HARTMANN JOB-WERNER ,  STEUERWALD MANFRED ,  KITTLER WOFFRAM

    IPC: C09D5/23 ,  G11B5/702

    Abstract: 1,153,453. Magnetic compositions. BADISCHE ANILIN- & SODA FABRIK A.G. 28 Sept., 1966 [29 Sept., 1965], No. 43247/66. Heading H1H. In the production of magnetic recording media by applying a suspension of ferromagnetic powder in a solution of a linear polyamide on to a backing, the applied layer contains 10-150% by weight (referred to the polyamide) of a soluble condensation product of an aliphatic monocarboxylic acid having 4-22 carbon atoms, and an aliphatic hydroxyamine having at least one primary or secondary amino group, a molecular wt. of below 500, and, e.g., 2-18 carbon atoms. The layer is then dried and heated above the softening point of the polyamide, e.g. at 50-110‹ C. Suitable acids are butyric, caproic, caprylic, capric, lauric, tridecanoic, palmitic, stearic, nonadecylic, sorbic, linoleic, oleic, and sperm or linseed oil fatty acid. Suitable hydroxyamines are 3-hydroxypropylamine, 2-aminoethanol, N - methyl - 2 - aminoethanol, N - hydroxyethyl - 2 - aminoethanol, 2 - aminobutanol, 2- amino - 2 - methyl - propanol, 3 - amino - 2 - hydroxy - propanol, diethanolamine monomethylether, N,N 1 - di - 2 - hydroxyethylethylenediamine, N,N 1 - di - 2 - hydroxyethylpropylenediamine. Equimolar amounts may be used. Suitable polyamide-forming materials, solvents, plasticizers, dispersing agents, and backings are listed. 400-650 pts. by wt. of powder, e.g. acicular γ-Fe 2 O 3 , Fe 3 O 4 , or Fe, may be used per 100 pts. polyamide.

    8.
    发明专利
    未知

    公开(公告)号：DE3911475A1

    公开(公告)日：1990-10-11

    申请号：DE3911475

    申请日：1989-04-08

    Applicant: BASF AG

    Inventor： KOVACS JENOE DR ,  FESER RAINER DR ,  OHLINGER MANFRED DR ,  STEUERWALD MANFRED

    IPC: B44F1/12 ,  C09D5/23 ,  G11B5/70 ,  G11B5/84

    Abstract: The invention relates to a blocking film, in particular hot blocking film, consisting of a carrier film and a transfer layer which can be removed therefrom and which has at least one magnetic layer of a dispersion of magnetisable particles based on chromium dioxide and/or iron oxide, and which may carry, on the side facing away from the carrier film, an adhesive layer which serves for fixing the transfer layer to a substrate.

    9.
    发明专利
    未知

    公开(公告)号：DE3842176A1

    公开(公告)日：1990-06-21

    申请号：DE3842176

    申请日：1988-12-15

    Applicant: BASF AG

    Inventor： STEUERWALD MANFRED ,  OHLINGER MANFRED DR ,  KOVACS JENOE DR ,  SCHWARZ DIETER

    IPC: B41M5/00 ,  B32B7/02 ,  B32B7/06 ,  B32B27/20 ,  G11B5/70 ,  G11B5/84

    Abstract: The invention relates to a transfer film with a magnetic layer, consisting essentially of a carrier film, a separating layer and a transfer layer detachable therefrom and formed from at least one magnetic layer, it being the case after the detachment of the carrier film the surface-forming layer on the side of the magnetic layer pointing towards the carrier film consists of a cover layer, containing inorganic pigments in a cross-linked polymer matrix, in a thickness of 0.2 to 5.0 mu m with a surface resistance of 10 to 10 ohm/cm.

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