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公开(公告)号：JPS53141604A
公开(公告)日：1978-12-09
申请号：JP5670078
申请日：1978-05-15
Applicant: BASF AG
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公开(公告)号：FR2391526B1
公开(公告)日：1982-06-25
申请号：FR7814420
申请日：1978-05-16
Applicant: BASF AG
Inventor： HUEBNER WERNER DIPL ING , HARTMANN JOB-WERNER DIPL CHEM , DOMAS FRIEDRICH DIPL ING , NAGEL PETER DIPL ING , DEIGNER PAUL DR , KOESTER EBERHARD DIPL PHYS DR , HAUSER HANS
Abstract: A process and apparatus for the manufacture of magnetic recording media, in which, immediately before the magnetic dispersion is applied to a base, the dispersion is subjected to shear by means of a disc rotatably mounted in a housing, by introducing it at the center of rotation of the disc and forcing it through a gap formed between the face of the disc and the wall of the housing, which gap tapers toward the rim of the disc.
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公开(公告)号：DE2556188A1
公开(公告)日：1977-06-23
申请号：DE2556188
申请日：1975-12-13
Applicant: BASF AG
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4.发明专利
公开(公告)号：DE2357517A1
公开(公告)日：1975-05-28
申请号：DE2357517
申请日：1973-11-17
Applicant: BASF AG
Inventor： HARTMANN JOB-WERNER DIPL CHEM , FALK ROLAND DIPL CHEM DR , KRUG ARIBERT , HUBER GEORG , BALZ WERNER DIPL CHEM DR , MAHLER KARL DIPL ING DR
Abstract: The film undergoing the magnetisation process may be applied to both sides of the metallic disc. The film is a mixture of binding material and anisotropic magnetic particles and is applied on the disc in a liquid form. It is spread by centrifugal force, with the disc rotating at high speed. It is magnetised, hardened, ground and then polished. One pair of poles is so arranged that magnetism spreads into the symmetrical plane and forms another even shaped pole pair but of opposite polarity and which converges pointed to the symmetry plane. The distance between the magnetic crests is greater than that of the pole faces and the flux density greates near the poles. The position of the poles is adjustable; during the film application they move toward each other. With this method of film application the reading potential is improved by 50%.
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公开(公告)号：DE2754885A1
公开(公告)日：1979-06-13
申请号：DE2754885
申请日：1977-12-09
Applicant: BASF AG
Inventor： HARTMANN JOB-WERNER DIPL CHEM , KOESTER EBERHARD DIPL PHYS DR , OHLINGER MANFRED DIPL CHEM DR
Abstract: Acicular, magnetic materials, (A) are coated with 0.3-5 (0.5-3) wt.%, w.r.t. (A), of a perfluorocarboxylic acid, perfluoroalkane-sulphonic acid, their salts or acid derivs., having formula (CnF2n+1)-Y-X (I) (where n is integer 4-12; Y is C=O or SO2; X is F, Cl, OZ or NR2; Z is H, alkali metal or NH4 and R is H, alkyl, aminoalkyl, hydroxyalkyl, aralkyl, aryl or isocyanato-alkyl contg. 1-5C in each alkyl gp.). (A) are used in the mfr. of magnetic recording carriers, consisting of a support coated with a layer of finely-divided (A) dispersed in a polymer binder. Packing density in magnetic layer and particle orientation are improved. Remanence increase achieved improves electro-acoustic properties. Tendency to smear is low. Resistance to abrasion is not reduced, and may even be increased. On using acicular CrO2, the stability of remanent magnetic flux on storage under unfavourable climatic conditions is improved.
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Patent Agency Ranking
公开(公告)号：NL7804420A
公开(公告)日：1978-11-20
申请号：NL7804420
申请日：1978-04-25
Applicant: BASF AG
Inventor： HUEBNER WERNER DIPL ING , HARTMANN JOB-WERNER DIPL CHEM , DOMAS FRIEDRICH DIPL ING , NAGEL PETER DIPL ING , DEIGNER PAUL DR , KOESTER EBERHARD DIPL PHYS DR , HAUSER HANS
Abstract: A process and apparatus for the manufacture of magnetic recording media, in which, immediately before the magnetic dispersion is applied to a base, the dispersion is subjected to shear by means of a disc rotatably mounted in a housing, by introducing it at the center of rotation of the disc and forcing it through a gap formed between the face of the disc and the wall of the housing, which gap tapers toward the rim of the disc.
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公开(公告)号：DE2722078B2
公开(公告)日：1979-10-31
申请号：DE2722078
申请日：1977-05-16
Applicant: BASF AG
Inventor： HUEBNER WERNER DIPL ING , HARTMANN JOB-WERNER DIPL CHEM , DOMAS FRIEDRICH DIPL ING , NAGEL PETER DIPL ING , DEIGNER PAUL DR , KOESTER EBERHARD DIPL PHYS DR , HAUSER HANS
Abstract: A process and apparatus for the manufacture of magnetic recording media, in which, immediately before the magnetic dispersion is applied to a base, the dispersion is subjected to shear by means of a disc rotatably mounted in a housing, by introducing it at the center of rotation of the disc and forcing it through a gap formed between the face of the disc and the wall of the housing, which gap tapers toward the rim of the disc.
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公开(公告)号：DE2726370A1
公开(公告)日：1978-12-14
申请号：DE2726370
申请日：1977-06-10
Applicant: BASF AG
Abstract: In order to determine the homogeneity of a magnetic dispersion, part of the dispersion is conducted through a measuring cell prior to its application to a base, the size, number and type of those regions of the magnetic dispersion which interfere with the homogeneity being determined with the aid of magnetic measurements. The measuring cell contains a magnetic head, a magnetic dispersion is made to flow in a stream of constant cross section past the air gap of the magnetic head, and a magnetic field at least partially penetrating the magnetic dispersion is produced. From the characteristics of the amplified output voltage of the magnetic head the various parameters of the inhomogeneities in the magnetic dispersion can then be ascertained.
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公开(公告)号：DE2501902A1
公开(公告)日：1976-07-22
申请号：DE2501902
申请日：1975-01-18
Applicant: BASF AG
Inventor： PISTER PHILIPP , OHLINGER MANFRED DIPL CHEM DR , STRITZINGER HEINZ DIPL ING , HARTMANN JOB-WERNER DIPL CHEM , WETTSTEIN EUGEN
Abstract: Process for improving the dispersibility of needle-shaped magnet oxide pigments used for magnetic recording carriers, by washing the pigment in an aq. medium, filtering and drying. The washing water contains, by wt. 0.1-10% of a polymerised, organic, water-soluble or at least water-miscible, surfactant, and is used at 30-95 degrees C. The wash water pref. contains 4-8% of the surfactant and is used at 85-95 degrees C. the pref. surfactants being an melamine-formaldehyde condensn. product and/or a phthalic acid-polyol reaction product and/or a ricinoleic acid-maleic anhydride product, with mol.wt. 300-400. The pigment is pref. gamma Fe2O3. The magnetic recording tape obtd. has reducted direct current noise and lower harmonic distortion.
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公开(公告)号：DE2461936A1
公开(公告)日：1976-07-08
申请号：DE2461936
申请日：1974-12-31
Applicant: BASF AG
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