公开(公告)号：DE3065058D1

公开(公告)日：1983-11-03

申请号：DE3065058

申请日：1980-08-21

Applicant: BASF AG

Inventor： STECK WERNER DR ,  SARNECKI WILHELM DR ,  MAROSI LASZLO DR ,  OHLINGER MANFRED DR ,  LOESER WERNER DR

IPC: G11B5/706 ,  B22F9/22 ,  C09D5/23 ,  C09D7/12 ,  G11B5/70 ,  H01F1/06

Abstract: A process for the manufacture of acicular ferromagnetic iron particles by heating a goethite, provided with a shape-stabilizing surface coating, at 250 DEG -450 DEG C. in an atmosphere containing water vapor at a partial pressure of not less than 30 mbar, to give alpha-iron(III) oxide, and reducing this material with hydrogen at 275 DEG -425 DEG C., and the use of the iron particles thus obtained as magnetic material in the production of magnetic recording media.

公开(公告)号：CH384569A

公开(公告)日：1964-11-30

申请号：CH6338158

申请日：1958-08-28

Applicant: BASF AG

Inventor： POMMER HORST DR ,  SARNECKI WILHELM DR

IPC: A23L1/275 ,  C07C403/00

公开(公告)号：DE3224325A1

公开(公告)日：1984-01-05

申请号：DE3224325

申请日：1982-06-30

Applicant: BASF AG

Inventor： OHLINGER MANFRED DR ,  VAETH GUENTER ,  RUDOLF PETER DR ,  SARNECKI WILHELM DR ,  JAKUSCH HELMUT DR ,  KOESTER EBERHARD DR ,  MELZER MILENA

IPC: C01G49/02 ,  C01G49/06 ,  G11B5/706 ,  H01F1/11 ,  B05D5/12 ,  G11B5/62

Abstract: A process for the preparation of acicular ferrimagnetic iron oxides by reducing gamma-iron(III) oxide hydroxide to magnetite, at from 280 DEG to 620 DEG C., by means of an organic compound which is decomposable at this temperature in the presence of iron oxide, and, optionally, a stream of reducing gas, and, if desired, then oxidizing the magnetite with oxygen-containing gases, at from 150 DEG to 450 DEG C., to acicular ferrimagnetic iron oxide of the formula FeOx, where x is from above 1.33 to 1.50, wherein the organic compound used for the reduction is a non-polar glycerol ester of a fatty acid which is introduced into the aqueous reaction suspension during the preparation of the gamma-iron(III) oxide hydroxide.

公开(公告)号：DE3063654D1

公开(公告)日：1983-07-14

申请号：DE3063654

申请日：1980-04-21

Applicant: BASF AG

Inventor： RUDOLF PETER DR ,  STECK WERNER DR ,  SARNECKI WILHELM DR ,  JAECKH CHRISTOF DR

IPC: C01G49/00 ,  C01G49/02 ,  C09D5/23 ,  C09D7/12 ,  G11B5/70 ,  G11B5/706 ,  H01F1/11

Abstract: A process for the manufacture of acicular magnetic iron oxides which consist of a core of gamma-iron(III) oxide and a shell of a magnetite modified with zinc(II) ions and/or manganese(II) ions and which contain, based on the total modified gamma-iron(III) oxide, from 0.1 to 20 percent by weight of iron(II) ions, from 0.1 to 10 percent by weight of zinc(II) ions and/or from 0.1 to 10 percent by weight of manganese(II) ions.

公开(公告)号：CH433269A

公开(公告)日：1967-04-15

申请号：CH799064

申请日：1964-06-18

Applicant: BASF AG

Inventor： SARNECKI WILHELM DR

IPC: A61K31/59 ,  C07C403/00 ,  C07F9/54 ,  C07C33/02 ,  C07C13/20

公开(公告)号：CH409941A

公开(公告)日：1966-03-31

申请号：CH563263D

申请日：1963-05-06

Applicant: BASF AG

Inventor： SARNECKI WILHELM DR ,  NUERRENBACH AXEL DR ,  REIF WERNER DR

IPC: C07C13/20

公开(公告)号：CH357718A

公开(公告)日：1961-10-31

申请号：CH357718D

申请日：1957-06-03

Applicant: BASF AG

Inventor： POMMER HORST DR ,  SARNECKI WILHELM DR ,  WITTIG GEORG DR

公开(公告)号：DE3263427D1

公开(公告)日：1985-06-05

申请号：DE3263427

申请日：1982-10-22

Applicant: BASF AG

Inventor： SARNECKI WILHELM DR ,  KOVACS JENOE DR ,  LOESER WERNER DR ,  RUDOLF PETER DR ,  VAETH GUENTER

IPC: C01G49/02 ,  C01G49/06 ,  C01G49/08 ,  G11B5/706 ,  H01F1/11

Abstract: Acicular ferrimagnetic iron oxides are prepared by a process in which iron (III) oxide hydroxide consisting essentially of lepidocrocite is reduced at from 350 DEG to 600 DEG C. by means of an organic compound which is a synthetic polymer with a molecular weight of from 3,000 to 40,000 to give magnetite, which, if desired, is subsequently partially or completely oxidized with an oxygen-containing gas at from 200 DEG to 450 DEG C.

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：CH441306A

公开(公告)日：1967-08-15

申请号：CH663664

申请日：1964-05-21

Applicant: BASF AG

Inventor： NUERRENBACH AXEL DR ,  SARNECKI WILHELM DR ,  REIF WERNER DR

IPC: C07F9/54