1.
    发明专利
    未知

    公开(公告)号:DE4012240A1

    公开(公告)日:1991-10-17

    申请号:DE4012240

    申请日:1990-04-14

    Applicant: BASF AG

    Abstract: The orientation ratio (Rf) of a magnetic layer is defined as the ratio of the magnetizations in the playing direction and the crosswise direction. Assuming that the magnetic layer has anisotropy with respect to the transmittance of infrared light, owing to the orientation of the magnetic pigments, infrared light from a source (IR) is passed through a polarizer (P). The linearly polarized light strikes the magnetic recording medium (M), which is conveyed over a transparent support (T). The support and polarizer are adjusted with respect to one another so that a detector (D) is exposed to maximum light intensity, which is proportional to the orientation ratio (Rf).

    5.
    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

    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.

    6.
    发明专利
    未知

    公开(公告)号:DE59105824D1

    公开(公告)日:1995-08-03

    申请号:DE59105824

    申请日:1991-04-08

    Applicant: BASF AG

    Abstract: The orientation ratio (Rf) of a magnetic layer is defined as the ratio of the magnetizations in the playing direction and the crosswise direction. Assuming that the magnetic layer has anisotropy with respect to the transmittance of infrared light, owing to the orientation of the magnetic pigments, infrared light from a source (IR) is passed through a polarizer (P). The linearly polarized light strikes the magnetic recording medium (M), which is conveyed over a transparent support (T). The support and polarizer are adjusted with respect to one another so that a detector (D) is exposed to maximum light intensity, which is proportional to the orientation ratio (Rf).

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