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公开(公告)号：DE3932389A1
公开(公告)日：1991-04-11
申请号：DE3932389
申请日：1989-09-28
Applicant: BASF AG
Inventor： MUELLER MICHAEL WOLFGANG DR , SCHWAB EKKEHARD DR , ARNDT VOLKER DR
Abstract: Finely divided hexagonal ferrite powder is prepared by autoclave treatment of an aqueous alkaline suspension containing the ferrite-forming metal ions at from 250 DEG to 330 DEG C. and subsequent heating of the resulting material at not more than 900 DEG C., by a process in which the ferrite-forming metal ions are used in the form of salts melted in their water of crystallization.
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公开(公告)号：DE3608540A1
公开(公告)日：1987-09-17
申请号：DE3608540
申请日：1986-03-14
Applicant: BASF AG
Inventor： ARNDT VOLKER DR , MEYER BERND DR , FESER RAINER DR , STECK WERNER DR , JAKUSCH HELMUT DR
Abstract: Acicular alpha -Fe2O3 is prepared from iron(III) salts by heating an alkaline aqueous suspension of iron(III) hydroxide in the presence of one or more organic substances which form complexes with iron(III) ions to a temperature of 100 DEG C. or less.
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公开(公告)号：DE3677402D1
公开(公告)日：1991-03-14
申请号：DE3677402
申请日：1986-04-11
Applicant: BASF AG
Inventor： ARNDT VOLKER DR , MEYER BERND DR , STECK WERNER DR , JAKUSCH HELMUT DR
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公开(公告)号：DE3514008A1
公开(公告)日：1986-10-23
申请号：DE3514008
申请日：1985-04-18
Applicant: BASF AG
Inventor： ARNDT VOLKER DR , MEYER BERND DR , STECK WERNER DR , JAKUSCH HELMUT DR
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公开(公告)号：DE59005437D1
公开(公告)日：1994-05-26
申请号：DE59005437
申请日：1990-09-19
Applicant: BASF AG
Inventor： MUELLER MICHAEL WOLFGANG DR , SCHWAB EKKEHARD DR , ARNDT VOLKER DR
Abstract: Finely divided hexagonal ferrite powder is prepared by autoclave treatment of an aqueous alkaline suspension containing the ferrite-forming metal ions at from 250 DEG to 330 DEG C. and subsequent heating of the resulting material at not more than 900 DEG C., by a process in which the ferrite-forming metal ions are used in the form of salts melted in their water of crystallization.
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Patent Agency Ranking
公开(公告)号：DE59002043D1
公开(公告)日：1993-09-02
申请号：DE59002043
申请日：1990-01-03
Applicant: BASF AG
Inventor： REICHERT MARTIN DR , WUNSCH GERD DR , PAESSLER PETER DR , ARNDT VOLKER DR , KASTENHUBER WERNER
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公开(公告)号：DE3900461A1
公开(公告)日：1990-07-12
申请号：DE3900461
申请日：1989-01-10
Applicant: BASF AG
Inventor： REICHERT MARTIN DR , WUNSCH GERD DR , PAESSLER PETER DR , ARNDT VOLKER DR , KASTENHUBER WERNER
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公开(公告)号：DE3807042A1
公开(公告)日：1989-09-14
申请号：DE3807042
申请日：1988-03-04
Applicant: BASF AG
Inventor： ARNDT VOLKER DR , AUWETER HELMUT DR , FESER RAINER DR , SCHWAB EKKEHARD DR
Abstract: A process for the preparation of finely divided acicular and pore- free alpha -Fe2O3 from iron (III) salts in the presence of at least one organic substance forming complexes with iron (III) ions in alkaline suspension at temperatures between 80 and 250 DEG C and its use for the preparation of magnetic materials suitable for magnetic recording media.
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公开(公告)号：DE3732526A1
公开(公告)日：1989-04-06
申请号：DE3732526
申请日：1987-09-26
Applicant: BASF AG
Inventor： SCHWAB EKKEHARD DR , ARNDT VOLKER DR , FESER RAINER DR , MEYER BERND DR
Abstract: The invention relates to a process for preparing acicular alpha -iron(III) oxide hydroxide by reacting an aqueous solution of an iron(II) salt with aqueous solutions of alkali metal hydroxides at elevated temperature and oxidising the suspensions thus obtained of iron(II) hydroxide with oxygen-containing gases to give the alpha -iron(III) oxide hydroxide.
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公开(公告)号：DE19532364A1
公开(公告)日：1997-03-06
申请号：DE19532364
申请日：1995-09-01
Applicant: BASF AG
Inventor： SCHLAEFER DIETER DR , ARNDT VOLKER DR , MAUS MICHAEL DR , SCHMITT DIETER DR
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