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公开(公告)号：DE3664827D1
公开(公告)日：1989-09-07
申请号：DE3664827
申请日：1986-10-07
Applicant: BASF AG
Inventor： STECK WERNER DR , MAROSI LASZLO DR , HABERKORN HERBERT DR , FESER RAINER DR , HUEBNER WERNER , JAKUSCH HELMUT DR
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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：DE3664826D1
公开(公告)日：1989-09-07
申请号：DE3664826
申请日：1986-09-30
Applicant: BASF AG
Inventor： STECK WERNER DR , HABERKORN HERBERT DR , MAROSI LASZLO DR , HUEBNER WERNER , JAKUSCH HELMUT DR
IPC: H01F1/11 , C01G37/027 , G11B5/706 , H01F1/10
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：DE3600624A1
公开(公告)日：1987-07-16
申请号：DE3600624
申请日：1986-01-11
Applicant: BASF AG
Inventor： STECK WERNER DR , MAROSI LASZLO DR , HABERKORN HERBERT DR , FESER RAINER DR , HUEBNER WERNER , JAKUSCH HELMUT DR
IPC: G11B5/706 , C01G37/027 , B05D5/12
Abstract: The invention relates to a process for stabilizing acicular (needle-shaped) ferromagnetic chromium dioxide by treatment with alkali metal hydroxides in aqueous alkaline suspension at elevated temperature.
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公开(公告)号：DE3536116A1
公开(公告)日：1987-04-16
申请号：DE3536116
申请日：1985-10-10
Applicant: BASF AG
Inventor： STECK WERNER DR , MAROSI LASZLO DR , HABERKORN HERBERT DR , FESER RAINER DR , HUEBNER WERNER , JAKUSCH HELMUT DR
IPC: H01F1/11 , C01G37/027 , G11B5/706 , G11B5/84
Abstract: The invention relates to a process for stabilising acicular (needle-shaped) ferromagnetic chromium dioxide by treatment with alkali metal hydroxides in an aqueous alkaline suspension at elevated temperature.
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Patent Agency Ranking
公开(公告)号：DE3876686D1
公开(公告)日：1993-01-28
申请号：DE3876686
申请日：1988-05-20
Applicant: BASF AG
Inventor： MUELLER NORBERT DR , OHLINGER MANFRED DR , FESER RAINER DR , BOETTCHER BERNHARD DR , RUDOLF PETER DR , HUEBNER WERNER
IPC: C01G37/027 , G11B5/706 , H01F1/11
Abstract: In the prodn. of stabilised acicular ferromagnetic chromium dioxide by conversion of Cr (III) and Cr (VI) oxides at 200-600 deg. C and 100-700 bars in a high pressure reactor in the presence of water with addn. of modifying agent(s) and then surface redn. in an aq. suspension to form a Cr (III) cpd. on the surfaces, the novelty is that 0.1-5.0% (by wt. of chromium dioxide) of a mono- or poly-basic 2-6C hydroxy carboxylic acid.
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公开(公告)号：DE3766394D1
公开(公告)日：1991-01-10
申请号：DE3766394
申请日：1987-03-25
Applicant: BASF AG
Inventor： RUDOLF PETER DR , OHLINGER MANFRED DR , MUELLER NORBERT DR , HUEBNER WERNER
IPC: H01F1/11 , C01G37/027 , G11B5/706
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公开(公告)号：DE3828498A1
公开(公告)日：1990-03-01
申请号：DE3828498
申请日：1988-08-23
Applicant: BASF AG
Inventor： MUELLER MICHAEL WOLFGANG DR , SCHWAB EKKEHARD DR , AUWETER HELMUT DR , FESER RAINER DR , HUEBNER WERNER , MUELLER NORBERT DR , OHLINGER MANFRED DR , DIKOW HERMANN DR
IPC: C01G37/027 , C09D5/23 , C09D7/12 , G11B5/706 , H01F1/11
Abstract: The invention relates to a chromium dioxide material, consisting of needle-shaped, ferromagnetic chromium dioxide particles having a non-magnetic, hydrogenous surface protective layer, which is distinguished by an improved stability against chemical decomposition, a process for its preparation and magnetic recording material containing this chromium dioxide with high long-term climatic stability of the remanent magnetisation.
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公开(公告)号：DE3430819A1
公开(公告)日：1986-03-06
申请号：DE3430819
申请日：1984-08-22
Applicant: BASF AG
Inventor： HUEBNER WERNER , MELZER MILENA , KOESTER EBERHARD DR , BAUR REINHOLD DR , SOMMERMANN FRIEDRICH DR
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公开(公告)号：DE58907750D1
公开(公告)日：1994-07-07
申请号：DE58907750
申请日：1989-08-19
Applicant: BASF AG
Inventor： MUELLER MICHAEL WOLFGANG DR , SCHWAB EKKEHARD DR , AUWETER HELMUT DR , FESER RAINER DR , HUEBNER WERNER , MUELLER NORBERT DR , OHLINGER MANFRED DR , DIKOW HERMANN DR
IPC: C01G37/027 , C09D5/23 , C09D7/12 , G11B5/706 , H01F1/11
Abstract: The invention relates to a chromium dioxide material, consisting of needle-shaped, ferromagnetic chromium dioxide particles having a non-magnetic, hydrogenous surface protective layer, which is distinguished by an improved stability against chemical decomposition, a process for its preparation and magnetic recording material containing this chromium dioxide with high long-term climatic stability of the remanent magnetisation.
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