公开(公告)号：DE2860071D1

公开(公告)日：1980-11-13

申请号：DE2860071

申请日：1978-07-28

Applicant: BASF AG

Inventor： BRODT RUDOLF DR ,  JAKUSCH HELMUT DR ,  KOESTER EBERHARD DR ,  LOESER WERNER DR ,  OHLINGER MANFRED DR ,  SARNECKI WILHELM DR ,  STECK WERNER DR

IPC: C01G49/08 ,  C01G49/06 ,  G11B5/62 ,  G11B5/70 ,  G11B5/706 ,  H01F1/11

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.

公开(公告)号：DE1797373A1

公开(公告)日：1971-08-19

申请号：DE1797373

申请日：1968-09-21

Applicant: BASF AG

Inventor： BRODT RUDOLF DR ,  ULMERICH KARLHEINZ

IPC: G03F7/033

公开(公告)号：CH475093A

公开(公告)日：1969-07-15

申请号：CH1280166

申请日：1966-09-05

Applicant: BASF AG

Inventor： HENKLER HERBERT DR ,  WILHELM HANS DR ,  JOSEF GEORG DR FLOSS ,  STREHLER HUGO DR ,  BRODT RUDOLF DR

IPC: G03F7/031 ,  G03F7/037 ,  B41N1/12 ,  G03C1/68

公开(公告)号：CH489837A

公开(公告)日：1970-04-30

申请号：CH1118667

申请日：1967-08-09

Applicant: BASF AG

Inventor： JOSEF GEORG DR FLOSS ,  BAYERLEIN FRIEDRICH DR ,  BRODT RUDOLF DR ,  HENKLER HERBERT DR ,  STREHLER HUGO DR ,  WILHELM HANS DR ,  GEHM ROBERT DR

IPC: G03F7/037 ,  G03F7/02

公开(公告)号：CH475094A

公开(公告)日：1969-07-15

申请号：CH377167

申请日：1967-03-15

Applicant: BASF AG

Inventor： FAULHABER GERHARD DR ,  HENKLER HERBERT DR ,  WILHELM HANS DR ,  BRODT RUDOLF DR ,  JOSEF GEORG DR FLOSS

IPC: C08F283/04 ,  C08G69/02 ,  C08L77/00 ,  G03F7/027 ,  B41N1/12 ,  G03C1/68