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公开(公告)号：JPS61261218A
公开(公告)日：1986-11-19
申请号：JP10507986
申请日：1986-05-09
Applicant: BASF AG
Inventor： STECK WERNER , FESER RAINER , LOESER WERNER , RUDOLF PETER , VAETH GUENTER , JAKUSCH HELMUT , KOVACS JENOE
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公开(公告)号：JPS61251523A
公开(公告)日：1986-11-08
申请号：JP9843786
申请日：1986-04-30
Applicant: BASF AG
Inventor： STECK WERNER , HIBST HARTMUT , JAKUSCH HELMUT
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公开(公告)号：DE3684038D1
公开(公告)日：1992-04-09
申请号：DE3684038
申请日：1986-05-03
Applicant: BASF AG
Inventor： STECK WERNER , FESER RAINER , LOESER WERNER , RUDOLF PETER , VAETH GUENTER , JAKUSCH HELMUT , KOVACS JENOE
Abstract: In the prodn. of acicular Co-contg. ferromagnetic Fe oxide, (a) gamma-FeOOH seeds are produced by the acid process in a first stage from Fe(II) salt solns. by addn. of alkali and simultaneous oxidn. by introduction of air in the presence of 0.2-1.0wt.% phosphate ions w.r.t. the amt. of gamma-FeOOH end prod.; (b) these seeds are then grown to the gamma-FeOOH end prod. in a second stage at a pH of 4-5.5; and then (c) after filtering, washing and drying, this is dehydrated at 300-600 deq.C and reduced to magnetite in the presence of organic cpds. decomposing in the presence of Fe oxide, then oxidised to gamma-Fe2O3 with gas contg. O2; then (d) modified by pptn. of Fe(OH)2 and/or Co(OH)2 in alkaline suspension, filtration, drying and tempering under inert gas at 100-350 deg.C.
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公开(公告)号：DE3375849D1
公开(公告)日：1988-04-07
申请号：DE3375849
申请日：1983-04-28
Applicant: BASF AG
Inventor： MELZER MILENA , JAKUSCH HELMUT , GRAU WERNER DR , KOESTER EBERHARD DR , LOESER WERNER DR , POLKE REINHARD DR , SCHAEDEL GUENTER DR , OHLINGER MANFRED DR , VAETH GUENTER
Abstract: A magnetic dispersion which can be applied to a non-magnetic base to produce a recording medium is prepared by dispersing a magnetically anisotropic material in a polymer binder and in an organic solvent by a method wherein the magnetically anisotropic material is worked in a jet mill before and/or during dispersing.
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Patent Agency Ranking
公开(公告)号：DE59200858D1
公开(公告)日：1995-01-12
申请号：DE59200858
申请日：1992-02-28
Applicant: BASF AG
Inventor： RICHTER HANS , SCHWAB EKKEHARD , JAKUSCH HELMUT , HIBST HARTMUT , GRAU WERNER , KNELLER ECKHART , HAWIG REINHARDT
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公开(公告)号：DE3683531D1
公开(公告)日：1992-03-05
申请号：DE3683531
申请日：1986-04-23
Applicant: BASF AG
Inventor： STECK WERNER , HIBST HARTMUT , JAKUSCH HELMUT
Abstract: Isometric magnetic Fe oxide (I) contg. 2-8 wt.% Co and 0.5-6 wt.% Ti-IV ions is produced by reacting acicular FeOOH in aq. alkaline suspension with Co-II, Fe-II and Ti-IV cpds. at pH over 8 under inert gas at temps. between 35 deg. C and the b.pt. of the suspension. The reaction prod. is (partly) oxidised with oxidising gas at 120-450 deg. C. The original gamma-FeOOH may contain Co and/or Ti, in which case addn. of Co-II and/or Ti-IV ions may not be necessary. It is pref. used in the suspension contg. salts in which it is prepd..
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公开(公告)号：AT114866T
公开(公告)日：1994-12-15
申请号：AT92905567
申请日：1992-02-28
Applicant: BASF AG
Inventor： RICHTER HANS JUERGEN , SCHWAB EKKEHARD , JAKUSCH HELMUT , HIBST HARTMUT , GRAU WERNER , KNELLER ECKHART , HAWIG REINHARDT
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公开(公告)号：DE3516885A1
公开(公告)日：1986-11-13
申请号：DE3516885
申请日：1985-05-10
Applicant: BASF AG
Inventor： STECK WERNER , FESER RAINER , LOESER WERNER , RUDOLF PETER , VAETH GUENTER , JAKUSCH HELMUT , KOVACS JENOE
IPC: C01G49/00 , C01G49/06 , C09D5/23 , G11B5/706 , H01F1/11 , C01G49/02 , C01G51/00 , C08K3/22 , C09D7/12 , G11B5/84 , B05D5/12 , C04B35/26
Abstract: The preparation of acicular ferrimagnetic iron oxides which contain cobalt and phosphate ions and, if desired, further additives, and their use for manufacturing magnetic recording media.
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公开(公告)号：DE3515517A1
公开(公告)日：1986-11-06
申请号：DE3515517
申请日：1985-04-30
Applicant: BASF AG
Inventor： STECK WERNER , HIBST HARTMUT , JAKUSCH HELMUT
Abstract: The iron oxides are prepared by reacting needle-shaped hydrated iron(III) oxides with compounds of divalent cobalt and iron and compounds of tetravalent titanium in aqueous alkaline suspension at elevated temperature.
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