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41.发明专利
公开(公告)号：DE3374480D1
公开(公告)日：1987-12-17
申请号：DE3374480
申请日：1983-07-23
Applicant: BASF AG
Inventor： STECK WERNER DR , RUDOLF PETER DR , SARNECKI WILHELM DR , LOESER WERNER DR , KOVACS JENOE DR , JAKUSCH HELMUT DR
Abstract: Acicular ferromagnetic metal particles consisting essentially of iron are prepared by a process wherein acicular iron(III) oxide hydroxide provided with a shape-stabilizing surface coating, or iron(III) oxide obtained therefrom by dehydration, is reduced by means of a decomposable organic compound and hydrogen.
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公开(公告)号：DE3535465A1
公开(公告)日：1987-04-09
申请号：DE3535465
申请日：1985-10-04
Applicant: BASF AG
Inventor： STECK WERNER DR , HABERKORN HERBERT DR , MAROSI LASZLO DR , HUEBNER WERNER , JAKUSCH HELMUT DR
Abstract: Ferromagnetic chromium dioxide is improved by subjecting chromium dioxide materials prepared by a known method to an additional heat treatment.
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公开(公告)号：DE3516884A1
公开(公告)日：1986-11-13
申请号：DE3516884
申请日：1985-05-10
Applicant: BASF AG
Inventor： SCHWAB EKKEHARD DR , STECK WERNER DR , RUDOLF PETER DR , VAETH GUENTER , JAKUSCH HELMUT DR , KOVACS JENOE DR
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公开(公告)号：DE3345532A1
公开(公告)日：1985-06-27
申请号：DE3345532
申请日：1983-12-16
Applicant: BASF AG
Inventor： STECK WERNER DR , SARNECKI WILHELM DR , JAKUSCH HELMUT DR , MAROSI LASZLO DR
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公开(公告)号：DE3067620D1
公开(公告)日：1984-05-30
申请号：DE3067620
申请日：1980-08-21
Applicant: BASF AG
Inventor： SARNECKI WILHELM DR , MAROSI LASZLO DR , AUTZEN HORST DR , OHLINGER MANFRED DR , STECK WERNER DR
Abstract: A process for the manufacture of acicular ferrimagnetic iron oxide by heating iron(III) oxide or iron(III) oxide hydroxide at 220 DEG -460 DEG C. under a water vapor partial pressure of not less than 30 mbar, reducing the resulting product to magnetite by means of hydrogen and/or CO and/or an organic compound which can decompose in the presence of iron oxide, and then oxidizing the magnetite with an oxygen-containing gas to give acicular ferrimagnetic iron oxide of the formula FeOX, where X is from 1.33 to 1.50.
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Patent Agency Ranking
公开(公告)号：DE3228669A1
公开(公告)日：1984-02-02
申请号：DE3228669
申请日：1982-07-31
Applicant: BASF AG
Inventor： STECK WERNER DR , RUDOLF PETER DR , SARNECKI WILHELM DR , LOESER WERNER DR , KOVACS JENOE DR , JAKUSCH HELMUT DR
IPC: G11B5/706 , B22F1/00 , B22F9/22 , C01G49/02 , C09D5/23 , C09D7/12 , H01F1/06 , B22F9/18 , C01G49/00 , G11B5/62
Abstract: Acicular ferromagnetic metal particles consisting essentially of iron are prepared by a process wherein acicular iron(III) oxide hydroxide provided with a shape-stabilizing surface coating, or iron(III) oxide obtained therefrom by dehydration, is reduced by means of a decomposable organic compound and hydrogen.
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公开(公告)号：DE2429177A1
公开(公告)日：1976-01-22
申请号：DE2429177
申请日：1974-06-18
Applicant: BASF AG
Inventor： STECK WERNER DR , WUNSCH GERD DR , DEIGNER PAUL DR , OSTERTAG WERNER DR , UHL KARL DR ING
Abstract: In the prodn. of thin cohesive magnetic films based on Fe oxides and opt. Co oxides or their redn. prods. on substrates by gas plating, with thermal decompsn., with complex cpds. (I) of Fe and opt. Co and/or Ni on the hot substrate surface in the presence of O2 and redn. of the oxide film with H2, a crystalline metal oxide film is deposited on the surface at 150-300 degrees C in the presence of an inert gas or inert gas-H2 stream contg. 0.05-1.3 vol.% O2 or 0.25-6.5% air and the oxide film is reduced to a magnetic oxide or metallic film with H2 or H2 mixts. at 250-400 degrees C. Binder-free magnetic films with good adhesion and reproducible magnetic properties can be produced using only 2 stages and under conditions suitable for the Al discs normally used as substrate, for which thermal treatment above 300 degrees C and esp. above 380 degrees C is excluded.
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公开(公告)号：DE3783380D1
公开(公告)日：1993-02-18
申请号：DE3783380
申请日：1987-03-11
Applicant: BASF AG
Inventor： ARNDT VOLKER DR , FESER RAINER DR , STECK WERNER DR , JAKUSCH HELMUT DR
Abstract: In the prodn. of acicular alpha-Fe2O3 (I) by heating an alkaline aq. Fe(OH)3 suspension in the presence of organic cpd(s). (II) forming complexes with Fe-III ions to 80-250 deg.C, the novelty is that Fe(OH)3 modified with Sn-IV ions is used. The Fe(OH)3 is pref. modified with 10 power (-3) to 2 x 10 power (-2) mole Sn-IV salt/mole Fe-III salt. The Fe(OH)3 may also contain Cr-III and/or Al-III ions. The suspension pref. has pH 8.5-12. Pref. the filtered modified Fe(OH)3 ppte. is suspended and stirred in the presence of (II) at least once at not more than 100 deg.C and filtered again before heating.
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公开(公告)号：DE3780048D1
公开(公告)日：1992-08-06
申请号：DE3780048
申请日：1987-03-11
Applicant: BASF AG
Inventor： ARNDT VOLKER DR , MEYER BERND DR , FESER RAINER DR , STECK WERNER DR , JAKUSCH HELMUT DR
Abstract: The ferrite is formed by heating an alkaline, pH pref. 8.5-12, watery suspension of ferric-hydroxide, pref. after filtration and redispersion at 15-60 deg. C at least once, in soln. with at least one organic cpd., e.g. tartaric or citric acid, which forms complexes with ferric-ions. The reaction occurs, pref. after adding alpha-ferrite seedcrystals, in 2 steps with the first at 70-90 deg. C for 1/2 2 hours and the second consecutively for 20-60 hours at 90-100 deg. C. The alpha-ferrite is then converted into needle-shaped gamma-ferrite by reduction to magnetite and subsequent oxidation. Alternatively it can be converted into needle shaped magnetic crystals consisting essentially of Fe.
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公开(公告)号：DE4005163A1
公开(公告)日：1991-08-22
申请号：DE4005163
申请日：1990-02-17
Applicant: BASF AG
Inventor： STECK WERNER DR , SCHWARZMANN MATTHIAS DR , WEINACHT KURT , MERGER FRANZ DR
Abstract: Acrolein (I) is produced by isomerisation of propargyl alcohol (II) in the gas phase at 300-550 deg C and 0.01-50 bar, on heterogeneous catalysts contg alkaline-reacting metal ions (III). Pref (III) contain ions of Li, K, Na, Cs and/or Mg, Ca, Sr or Ba; pref (III) are mol sieves or structurally related Al phosphates contg the above ions, supporting materials doped with the ions, or alkaline earth oxides.
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