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

    公开(公告)号：JPH02226517A

    公开(公告)日：1990-09-10

    申请号：JP32856389

    申请日：1989-12-20

    Applicant: BASF AG

    Inventor： AUGUSUTO REENAA ,  RUDORUFU ZUYUTEINGAA ,  MIHIYAERU BOBURITSUHI ,  HERUMAN DEIKOBU ,  HERUMAN RORAA ,  BUERUNAA RENTSU ,  RUUTOBUIHI KURAITONAA ,  BUERUNAA ROTSUHO ,  NORUBERUTO SHIYUNAIDAA

    IPC: C09D5/23 ,  C09D127/04 ,  C09D127/06 ,  C09D175/00 ,  C09D175/04 ,  G11B5/70 ,  G11B5/702 ,  G11B5/706

    Abstract: PURPOSE: To stabilize long-time use without deteriorating magnetic characteristics by constituting a magnetic recording carrier of a polymer binder and ferromagnetic chromium dioxide finely dispersed into customarily used additives and additionally incorporating a multiple unsatd. org. compd. monomer specified in its content into the chromium dioxide. CONSTITUTION: The magnetic recording medium is mainly composed of a nonmagnetic carrier material, the polymer binder and the intrinsically ferromagnetic chromium dioxide finely dispersed into the customarily used additives and 0.1 to 8wt.% multiple unsatd. org. compd. monomer is additionally incorporated into the chromium dioxide. The monomer is a monomer having at least three double bonds per molecule, for which one kind of the compd. selected from a group consisting of linolenic acid or oil or oil-fatty acid mixture is used. More specifically, alcohol, acid, ester, diglyceride, 2,4-hexadienic acid, herring oil, sardine oil, etc., are used as the multiple unsatd. org. compd. to accelerate dispersion.

    MAGNETIC RECORDING CARRIER
    8.
    发明专利
    MAGNETIC RECORDING CARRIER 失效

    公开(公告)号：JPH0395718A

    公开(公告)日：1991-04-22

    申请号：JP21913690

    申请日：1990-08-22

    Applicant: BASF AG

    Inventor： UBUE KEPERAA ,  MIHIYAERU BOBURITSUHI ,  GIYUNTAA HAIRU ,  HERUMAN RORAA ,  AUGUSUTO REENAA ,  BUERUNAA RENTSU ,  GIYUNTAA SHIYURUTSU

    IPC: C08G18/12 ,  C08G18/66 ,  C08G18/76 ,  C08L75/04 ,  C09D5/23 ,  C09D175/00 ,  C09D175/04 ,  C09D177/02 ,  C09D179/08 ,  G11B5/702

    Abstract: PURPOSE: To make it possible to obtain various excellent mechanical characteristics by using specific polyurethane which is soluble in tetrahydrofuran, has no isocyanate groups, has side chains and has urea groups (plural) contg. OH groups at chain terminals as a binder. CONSTITUTION: The polyurethane which is soluble in the tetrahydrofuran, has no isocyanate groups, has the side chains, has the urea groups contg. the OH groups at the chain terminals and has a mol. wt. of 40000 to 2000000 is used as the thermoplastic polyurethane. The polyurethane formed in such a manner that the ratio of the OH groups of components A to C: the NCO groups of a component D: the amino groups of a component E are 1:1.03 to 1.3:0.03 to 0.3 from A. 1mol mixture composed of polydiol having a mol. wt. of 400 to 4000 and A2) polydiol having a mol. wt. exceeding 1400 of >=10 in the molar ratio of A1 to A2, B. 0.3 to 10mol mixture composed of arom. diol and B2) straight chain diol, C. 0.05 to 0.5mol tri- or polyol, D. 1.3 to 13mol diisocyanate, E. 0.09 to 2mol aminoalcohol is used. As a result, the binder which is excellent in a mechanical behavior is obtd.

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