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公开(公告)号：DE2447386A1
公开(公告)日：1976-04-22
申请号：DE2447386
申请日：1974-10-04
Applicant: BASF AG
Inventor： KOESTER EBERHARD DIPL PHYS DR , WUNSCH GERD DIPL CHEM DR , SCHOENAFINGER EDUARD DIPL CHEM , SCHNEEHAGE HANS HENNING DIPL C , JAKUSCH HELMUT DIPL PHYS DR
Abstract: A process for the manufacture of acicular magnetic gamma-iron(III) oxide by reducing acicular alpha-iron(III) oxide to magnetite and then oxidizing it to gamma-iron(III) oxide, wherein the alpha-iron(III) oxide is treated with a water-soluble alkaline earth metal compound and an alkylphenol with one to three alkyl radicals, each of 4 to 24 carbon atoms, on the benzene nucleus. Gamma-iron(III) oxides manufactured in this way show better magnetic orientability in the binder-containing dispersion, and a higher coercive force than prior art magnetic pigments.
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公开(公告)号：DE2320439A1
公开(公告)日：1974-11-07
申请号：DE2320439
申请日：1973-04-21
Applicant: BASF AG
Inventor： GAISER DIETER , KOESTER EBERHARD DIPL PHYS DR , SCHOETTLE KLAUS DIPL ING , GUENTHER FRIEDRICH
IPC: G11B23/087 , G11B23/04
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公开(公告)号：DE3116489A1
公开(公告)日：1982-11-11
申请号：DE3116489
申请日：1981-04-25
Applicant: BASF AG
Inventor： JAKUSCH HELMUT DIPL PHYS DR , LOESER WERNER DIPL ING DR , KOESTER EBERHARD DIPL PHYS DR , RUDOLF PETER DIPL CHEM DR , SENKPIEL WERNER DIPL CHEM DR , STECK WERNER DIPL CHEM DR
Abstract: A process for stabilizing pyrophoric acicular metal particles consisting essentially of iron, by reaction with oxygen-containing gases in two stages, wherein, in the first stage, up to 1/3 of the passivating layer present in the final state is formed at from 25 DEG to 45 DEG C. and, in a subsequent second stage, the remainder of the passivating layer is formed at from 50 DEG to 70 DEG C.
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公开(公告)号：DE2905352A1
公开(公告)日：1980-08-21
申请号：DE2905352
申请日：1979-02-13
Applicant: BASF AG
Inventor： RUDOLF PETER DIPL CHEM DR , STECK WERNER DIPL CHEM DR , KOESTER EBERHARD DIPL PHYS DR , OHLINGER MANFRED DIPL CHEM DR , JAECKH CHRISTOF DIPL CHEM DR
Abstract: A process for the manufacture of acicular magnetic iron oxide consisting of core of gamma-iron(III) oxide and a ferrite shell which contains, based on the total amount of magnetic material, from 0.2 to 12 per cent by weight of cobalt(II) ions and from 0.1 to 15 per cent by weight of iron(II) ions, wherein a precipitate of cobalt(II) hydroxide and iron (II) hydroxide is applied to acicular gamma-iron(III) oxide particles and the latter are heated at 100 DEG -200 DEG C.
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公开(公告)号：DE2722078C3
公开(公告)日：1980-07-10
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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Patent Agency Ranking
公开(公告)号：FR2391526A1
公开(公告)日：1978-12-15
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：DE2722078A1
公开(公告)日：1978-11-23
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：DE2535277A1
公开(公告)日：1977-02-24
申请号：DE2535277
申请日：1975-08-07
Applicant: BASF AG
Inventor： KOESTER EBERHARD DIPL PHYS DR , WUNSCH GERD DIPL CHEM DR , SCHOENFINGER EDUARD DIPL CHEM , SCHNEEHAGE HANS HENNING DIPL C
Abstract: A method of stabilizing pyrophoric metal powders by treating the metal powders with alkylene oxides to form a polymer coating on the metal particles.
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公开(公告)号：DE2434058A1
公开(公告)日：1976-02-05
申请号：DE2434058
申请日：1974-07-16
Applicant: BASF AG
Inventor： KOESTER EBERHARD DIPL PHYS DR , WUNSCH GERD DIPL CHEM DR , DEIGNER PAUL DR , STUMPFI WERNER DIPL PHYS DR , SCHNEEHAGE HANS HENNING DIPL C
Abstract: A process for the manufacture of acicular ferromagnetic metal pigments containing iron, having a reduced field strength distribution and a steeper residual magnetization curve, by applying an alkaline earth metal cation and an organic compound having at least one group capable of forming a chelate to appropriate acicular iron oxides and then reducing the treated oxides.
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公开(公告)号：DE2365178A1
公开(公告)日：1975-07-10
申请号：DE2365178
申请日：1973-12-29
Applicant: BASF AG
Inventor： KOESTER EBERHARD DIPL PHYS DR , WUNSCH GERD DIPL CHEM DR , DEIGNER PAUL DR , UHL KARL DIPL ING DR , STUMPFI WERNER DIPL PHYS DR , STECK WERNER DIPL CHEM DR
Abstract: 1496890 Surface oxidized magnetic powder BASF AG 30 Dec 1974 [29 Dec 1973] 56002/74 Heading C7U A particulate composition comprising Co 0À05 -0À96 Ni 0À95-0À04 is surface oxidized by N 2 O (optionally diluted with N 2 , CO 2 or noble gas) to form antiferromagnetic Co Ni oxide phase magnetically coupled with the ferromagnetic alloy phase. The particulate alloy may contain such amounts of Al, Cr, Fe, Mn and Zn that the magnetic exchange is not completely prevented and the treatment temperature may be up to 450‹C.
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