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

    公开(公告)号：JPH06295430A

    公开(公告)日：1994-10-21

    申请号：JP161594

    申请日：1994-01-12

    Applicant: BASF MAGNETICS GMBH

    Inventor： HAARARUTO KERAA ,  URURIHI IEEGAA ,  HERUMUUTO SHIYUTAININGAA ,  HERUMUUTO KOPUKE ,  KURAUSU DEIITAA SHIYOOMAN ,  HANSUUPEETAA SHIRUTOBERUKU

    IPC: C09D5/00 ,  C10M105/54 ,  C10M105/72 ,  C10N40/18 ,  G11B5/64 ,  G11B5/72 ,  G11B5/725

    Abstract: PURPOSE: To obtain a magnetic recording medium having a ferromagnetic metal layer on a nonmagnetic substrate and having a protective layer thereon which shows excellent durability against repeated use by constituting the protective layer of a component expressed by specified formula. CONSTITUTION: This magnetic recording medium consists of a nonmagnetic substrate, at least one ferromagnetic metal layer on the substrate and a protective layer on the metal layer. This protective layer is formed of a compsn. expressed by formula Z-(CF2 )m -(CH2 )n -X-Y-(CH2 )n -(CF2 )m -Z. In formula, X is -S- or -CHOH, Y is -S- or -C=O, Z is -CH3 , -CF3 or -CH=CH2 , n is an integer 2 to 17, and m is an integer 0 to 7. Thereby, the obtd. magnetic recording medium has excellent surface mechanical characteristics showing special durability even when it is repeatedly used, and the medium is extremely stable against corrosion of the metal thin film by air of humidity in air. Therefore, a recording medium having excellent wear resistance and corrosion resistance can be obtd.

    MAGNETIC RECORDING MEDIUM
    3.
    发明专利
    MAGNETIC RECORDING MEDIUM 失效

    公开(公告)号：JPH0676275A

    公开(公告)日：1994-03-18

    申请号：JP14930093

    申请日：1993-06-21

    Applicant: BASF MAGNETICS GMBH

    Inventor： URURITSUHI IEEGAA ,  MIHIYAERU BOBURITSUHI ,  HERUMUUTO KOPUKE ,  RAINAA EDAA ,  HANSUUPEETAA SHIRUTOBERUKU ,  KURAUSU DEIITAA SHIYOOMAN ,  HAARARUTO KERAA

    IPC: C09D5/23 ,  C09D175/00 ,  C09D175/04 ,  G11B5/64 ,  G11B5/72

    Abstract: PURPOSE: To improve wear resistance and corrosion resistance by forming a protective layer comprising a specified polyurethane having specified mol.wt. obtd. by specified reaction on a ferromagnetic metal layer. CONSTITUTION: A protective layer formed on a metal layer consists of a polyurethane having 500 to 10000 average mol.wt. This polyurethane is obtd. by the following reaction. An isocyanate expressed by formula Q-(NCO)z is made to react with a compd. expressed by formula Rf -A-B and/or a compd. expressed by formula X-RH-B. In formulae, Q is an alkyl, cycloalkyl or heterocycloalkyl group, (z) is an integer 1 to 5, Rf is a perfluoro (cyclo) alkyl or perfluoroalkyl aryl group having 3 to 30 carbon atoms, A is -(CH2 )n -, wherein(n)= 1 to 10, B is -OH, =NK, -NH2 or -(COOH), RH is an alkyl or cycloalkyl group having 1 to 30 carbon atoms, and X is -H, -OH, =NH, -NH2 , -SO3 H or -SO3 Na.

    MAGNETIC RECORDING MEDIUM
    4.
    发明专利
    MAGNETIC RECORDING MEDIUM 失效

    公开(公告)号：JPH06176346A

    公开(公告)日：1994-06-24

    申请号：JP21605493

    申请日：1993-08-31

    Applicant: BASF MAGNETICS GMBH

    Inventor： HERUMUUTO YAKUSHIYU ,  KURAUSU DEIITAA SHIYOOMAN ,  MIHIYAERU FUITSUTSUFUERUTO ,  HERUMAN RORAA ,  RAINHORUTO BAURU ,  EDOBUIN ROOTOFUSU

    IPC: C09D5/23 ,  C09D175/00 ,  C09D175/04 ,  G11B5/70 ,  G11B5/706 ,  G11B5/73

    Abstract: PURPOSE: To obtain a magnetic recording medium which contains main chromium dioxide as a magnetic material and does not have the drawbacks of drop-outs in copying by a sprinter process method. CONSTITUTION: The magnetic memory medium consists of a nonmagnetic substrate and a magnetic layer applied thereon. This magnetic layer is obtd. by applying a dispersion prepd. by uniformly dispersing at least 40wt.% acicular ferromagnetic chromium dioxide in a polymer binder consisting of polyurethane as a base on the substrate, then drying the coating. The magnetic layer in particular has an inside surface area of 5 to 30m /cm and the pigment concn. PVC per volume attains 45 to 65%. The magnetic recording medium is thus made adaptable to the sprinter process of rapid copying.

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