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    MAGNETIC RECORDING CARRIER
    1.
    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.

    MAGNETIC RECORDING CARRIER
    7.
    发明专利
    MAGNETIC RECORDING CARRIER 失效

    公开(公告)号：JPH02223012A

    公开(公告)日：1990-09-05

    申请号：JP32856289

    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 ,  C09D129/04 ,  C09D175/00 ,  C09D175/04 ,  G11B5/702 ,  G11B5/706

    Abstract: PURPOSE: To exhibit excellent stability to the deterioration of magnetic characteristics by forming a magnetic recording carrier of a nonmagnetic carrying material, polymer binder and magnetic material consisting of chromium dioxide as chief materials and forming a specific magnetizable layer on the carrying material. CONSTITUTION: This magnetic recording carrier is formed of the nonmagnetic carrying material, the polymer binder and the magnetic material consisting of the chromium dioxide as the chief materials and the magnetizable layer adhered on the carrying material. One kind of the org. compds. selected from a group consisting of steric hindrance phenol, cresol, arom. amine, benztriazole, triazine deriv., phosphorus-contg. acid ester, phenolic phosphate, its metal salt, benzophenone, substd. phenyl ester benzoate and thioacid alkyl ester are additionally incorporated into the magnetizable layer at 0.1 to 8wt.% of the weight of the chromium dioxide. As a result, the magnetic recording carrier exhibits the improved stability to the chemical decomposition by moisture and oxidative compds. without entailing the deterioration of the magnetic characteristics.

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