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公开(公告)号：DE3021111A1
公开(公告)日：1981-12-17
申请号：DE3021111
申请日：1980-06-04
Applicant: BASF AG
Inventor： SIEGLE HANS JOERG DIPL ING DR , REICH HANS HEINER DIPL CHEM DR , AUTZEN HORST DIPL CHEM DR , STECK WERNER DIPL CHEM DR , LOESER WERNER DIPL ING DR , HETZEL ECKHARD DIPL ING , OHLINGER MANFRED DIPL CHEM DR
Abstract: A process for the preparation of acicular ferromagnetic metal particles, consisting essentially of iron, by reducing acicular iron oxides and/or iron oxide hydroxides, which are either pure or are modified with conventional foreign metal ions, by means of a gaseous reducing agent in a fluidized bed furnace in which a stirrer is provided immediately above the fluidizing grid.
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公开(公告)号：DE2735316A1
公开(公告)日：1979-02-08
申请号：DE2735316
申请日：1977-08-05
Applicant: BASF AG
Inventor： BRODT RUDOLF DIPL CHEM DR , JAKUSCH HELMUT DIPL PHYS DR , KOESTER EBERHARD DIPL PHYS DR , LOESER WERNER DIPL ING DR , OHLINGER MANFRED DIPL CHEM DR , SARNECKI WILHELM DIPL-CHEM DR , STECK WERNER DIPL CHEM DR
Abstract: A process for the manufacture of acicular ferrimagnetic iron oxide by dehydrating acicular iron(III) oxide hydroxides to give acicular iron(III) oxides, then reducing these iron(III) oxides at from 300 DEG to 650 DEG C. by means of an organic compound which decomposes in this temperature range, and oxidizing the reduced product with an oxygen-containing gas at from 200 DEG to 500 DEG C., wherein the acicular iron(III) oxide hydroxides employed consist of a mixture of goethite and lepidocrocite, containing at least 60% of the latter, and the dehydration is carried out at from 250 DEG to 700 DEG C.
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公开(公告)号：DE2646348A1
公开(公告)日：1978-04-20
申请号：DE2646348
申请日：1976-10-14
Applicant: BASF AG
Inventor： STECK WERNER DIPL CHEM DR , SCHNEEHAGE HANS HEINNING DIPL , JAECKH CHRISTOF DIPL CHEM DR , HUEBNER WERNER DIPL ING , OHLINGER MANFRED DIPL CHEM DR , LOESER WERNER DIPL ING DR
Abstract: A method of preparing acicular ferromagnetic metal particles consisting essentially of iron and suitable for magnetic recording, said particles being modified at the surface with 0.02 to 0.2% by weight of carbon and with 0.5 to 1.9% by weight of phosphorus as phosphate, by reducing a finely divided acicular iron compound, wherein there are deposited on said iron compound, prior to reduction, (a) a hydrolysis-resistant substance selected from the group consisting of oxyacids of phosphorus, their esters and inorganic salts, and (b) a compound selected from the group consisting of aliphatic monobasic, dibasic and tribasic carboxylic acids of from 1 to 6 carbon atoms.
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公开(公告)号：DE2451217A1
公开(公告)日：1976-05-13
申请号：DE2451217
申请日：1974-10-29
Applicant: BASF AG
Inventor： STABENOW JOACHIM DIPL PHYS DR , WUNSCH GERD DIPL CHEM DR , DEIGNER PAUL DR , MUELLER FRANZ-JOSEF DIPL CHEM , LOESER WERNER DIPL ING DR , STECK WERNER DIPL CHEM DR
Abstract: A process for metallizing substrates by activation of the substrate by deposition of palladium from a palladium complex, followed by electroless metallization. The palladium is deposited on the substrate by dipping the substrate into a solution of a palladium(O) complex and decomposing this complex at from 100 DEG to 300 DEG C.
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公开(公告)号：DE3143870A1
公开(公告)日：1983-05-11
申请号：DE3143870
申请日：1981-11-05
Applicant: BASF AG
Inventor： SARNECKI WILHELM DIPL CHEM DR , KOVACS JENOE DIPL CHEM DR , LOESER WERNER DIPL ING DR , RUDOLF PETER DIPL CHEM DR , VAETH GUENTER
Abstract: Acicular ferrimagnetic iron oxides are prepared by a process in which iron (III) oxide hydroxide consisting essentially of lepidocrocite is reduced at from 350 DEG to 600 DEG C. by means of an organic compound which is a synthetic polymer with a molecular weight of from 3,000 to 40,000 to give magnetite, which, if desired, is subsequently partially or completely oxidized with an oxygen-containing gas at from 200 DEG to 450 DEG C.
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Patent Agency Ranking
公开(公告)号：DE2805621A1
公开(公告)日：1979-08-23
申请号：DE2805621
申请日：1978-02-10
Applicant: BASF AG
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公开(公告)号：DE2743298A1
公开(公告)日：1979-04-05
申请号：DE2743298
申请日：1977-09-27
Applicant: BASF AG
Inventor： JAECKH CHRISTOPHER DIPL CHEM D , STECK WERNER DIPL CHEM DR , BRODT RUDOLF DIPL CHEM DR , OHLINGER MANFRED DIPL CHEM DR , LOESER WERNER DIPL ING DR , KOESTER EBERHARD DIPL PHYS DR
Abstract: Acicular ferromagnetic metal particles essentially contain iron and carry, on their surface, from 0.02 to 0.6% by weight of boron in the form of a borate. Such particles may be obtained by reducing an acicular iron oxide with a gaseous reducing agent at from 250 to 500 DEG C, if boron oxyacid or an inorganic salt thereof is deposited on the said iron oxide before reduction. The acicular, ferromagnetic particles are principally used in magnetic recording media and the invention seeks to overcome the difficulty of providing such particles distinguished by a narrow particle size spectrum and pronounced acicular shape.
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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：DE2608022A1
公开(公告)日：1977-09-08
申请号：DE2608022
申请日：1976-02-27
Applicant: BASF AG
Inventor： STECK WERNER DIPL CHEM DR , LOESER WERNER DIPL ING DR , STEUERWALD MANFRED , WUNSCH GERD DIPL CHEM DR , DEIGNER PAUL DR
Abstract: A process for the manufacture of wear-resistant magnetic recording media comprising a dimensionally stable base, a thin ferromagnetic metal layer, containing cobalt and/or nickel, firmly bonded thereto and a thin protective layer applied thereon. The protective layer is produced by treating the recording medium in a liquid basic medium, containing gaseous oxygen, for from 1 to 60 minutes at from 5 DEG to 70 DEG C., washing and drying the treated recording medium and then heating it in air at from 170 DEG to 300 DEG C. This method offers a particularly simple way of providing the ferromagnetic layer of the recording medium with a thin but uniform, mechanically stable and wear-resistant protective layer.
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公开(公告)号：DE2606418A1
公开(公告)日：1977-09-01
申请号：DE2606418
申请日：1976-02-18
Applicant: BASF AG
Inventor： LOESER WERNER DIPL ING DR , MAYER DIETER DR , STECK WERNER DR , TREPTOW WOLFRAM DR , BOEHN HUGO
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