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    METHOD OF MANUFACTURING MAGNETIC RECORDING CARRIER
    1.
    发明专利
    METHOD OF MANUFACTURING MAGNETIC RECORDING CARRIER 失效

    公开(公告)号：JPH03171425A

    公开(公告)日：1991-07-24

    申请号：JP22851690

    申请日：1990-08-31

    Applicant: BASF AG

    Inventor： FURIIDORIHI ZOMAAMAN ,  NORUBERUTO SHIYUNAIDAA ,  GERUTO EERUHARUTO ,  RUUTOBUIHI KURAITONAA ,  BUERUNAA GURAU ,  AUGUSUTO REENAA ,  HANSU RAIHIERUTO

    IPC: G11B5/842

    Abstract: PURPOSE: To make it possible to obtain a dispersion which is excellent in a dispersion treatment by preparing this dispersion by stirring spherical frictional grinding media having a sp. gr. smaller than the sp. gr. of a magnetic material at a specific number of revolutions in a cylindrical hermetic frictional grinding vessel of a specific size. CONSTITUTION: This dispersion is prepd. by stirring the spherical frictional grinding media, which have the ratio of a length to diameter of 1.3 to 2.5:1, have the sp. gr. smaller than the sp. gr. of the magnetic material and have a diameter from 0.5 to 3mm in the cylindrical hermetic frictional grinding vessel loaded with these media by an anchor mixer or spiral mixer at 50 to 1000R.P.M. As a result, the magnetic material is treated extremely gently treated without damaging the acicular crystals in the shortest possible dispersion treatment time, by which the homogeneous and stable dispersion is obtd.

    MAGNETIC RECORDING CARRIER
    5.
    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.

    DISC-SHAPED MAGNETIC RECORDING CARRIER
    6.
    发明专利
    DISC-SHAPED MAGNETIC RECORDING CARRIER 失效

    公开(公告)号：JPS6423416A

    公开(公告)日：1989-01-26

    申请号：JP15954888

    申请日：1988-06-29

    Applicant: BASF AG

    Inventor： NORUBERUTO SHIYUNAIDAA ,  UBUE NOBUATSUKU ,  GERUTO NIKORAI ,  URUZURA KURAIN ,  BUERUNAA RENTSU ,  HERUMUUTO YAKUSHIYU ,  FUORUKAA KOTSUHO ,  FURIIDORITSUHI DOMASU

    IPC: C09D5/23 ,  C09D7/12 ,  G11B5/708 ,  G11B5/82

    Abstract: PURPOSE: To always impart the required amt. of a lubricant by incorporating a porous pigment having 300-1,000m /g BET specific surface area into the surface layer part of a magnetic layer by 1-10wt.% of the amt. of a magnetic material when at least one side of a nonmagnetic substrate is coated with the magnetic layer. CONSTITUTION: When at least one side of a nonmagnetic substrate is coated with a magnetic layer, this magnetic layer is made of a magnetic material finely dispersed in an org. binder and a porous pigment having 300-1,000m /g BET specific surface area is incorporated into the surface layer part of the magnetic layer by 1-10wt.%, preferably 2-6wt.% of the amt. of the magnetic material so as to reduce friction. The pigment is made of a molecular filter based on metal-aluminum silicate having a special crystal structure and the spaces in a three-dimensional network structure are formed by the reaction of aq. solns. of sodium aluminate and sodium silicate. Sticking effect is also reduced.

    MAGNETIC RECORDING CARRIER
    8.
    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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