公开(公告)号：DE2714588A1

公开(公告)日：1978-10-12

申请号：DE2714588

申请日：1977-04-01

Applicant: BASF AG

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

IPC: G11B5/706 ,  B22F9/22 ,  C09D5/23 ,  C09D7/12 ,  C21B15/00 ,  G11B5/712 ,  G11B5/714 ,  H01F1/06 ,  B22F9/00

Abstract: A process for the manufacture of acicular ferromagnetic iron particles by reducing acicular iron(III) oxide hydroxides which consist of pure synthetic lepidocrocite or a mixture of synthetic goethite and at least 70% by weight of synthetic lepidocrocite. The iron(III) oxide hydroxides used carry, on their surface, an alkaline earth metal cation and an anion of a monobasic, dibasic or tribasic aliphatic carboxylic acid of up to 6 carbon atoms or an organic compound containing at least two groups capable of chelating the alkaline earth metal cation, and are produced in such a way that they consist of at least 70 percent by weight of lepidocrocite and have a length-to-width ratio of not less than 15:1. Reduction of such iron(III) oxide hydroxides gives iron particles with pronounced shape anisotropy, which exhibit both good magnetic properties and a narrow field strength distribution.

公开(公告)号：DE2650890A1

公开(公告)日：1978-05-11

申请号：DE2650890

申请日：1976-11-06

Applicant: BASF AG

Inventor： BECKER HANS-JUERGEN DIPL CHEM ,  BRETTSCHNEIDER HELMUT ING GRAD ,  KOESTER EBERHARD DIPL PHYS DR ,  STECK WERNER DIPL CHEM DR ,  OHLINGER MANFRED DIPL CHEM DR

IPC: C01G49/06 ,  C01G49/00 ,  G11B5/706 ,  H01F1/11

公开(公告)号：DE2646348A1

公开(公告)日：1978-04-20

申请号：DE2646348

申请日：1976-10-14

Applicant: BASF AG

Inventor： STECK WERNER DIPL CHEM DR ,  SCHNEEHAGE HANS HEINNING DIPL ,  JAECKH CHRISTOF DIPL CHEM DR ,  HUEBNER WERNER DIPL ING ,  OHLINGER MANFRED DIPL CHEM DR ,  LOESER WERNER DIPL ING DR

IPC: C21B15/02 ,  B22F1/00 ,  B22F9/22 ,  C22C33/02 ,  H01F1/06 ,  H01F1/33 ,  H01F10/00 ,  B05D5/12

Abstract: A method of preparing acicular ferromagnetic metal particles consisting essentially of iron and suitable for magnetic recording, said particles being modified at the surface with 0.02 to 0.2% by weight of carbon and with 0.5 to 1.9% by weight of phosphorus as phosphate, by reducing a finely divided acicular iron compound, wherein there are deposited on said iron compound, prior to reduction, (a) a hydrolysis-resistant substance selected from the group consisting of oxyacids of phosphorus, their esters and inorganic salts, and (b) a compound selected from the group consisting of aliphatic monobasic, dibasic and tribasic carboxylic acids of from 1 to 6 carbon atoms.

公开(公告)号：DE2451217A1

公开(公告)日：1976-05-13

申请号：DE2451217

申请日：1974-10-29

Applicant: BASF AG

Inventor： STABENOW JOACHIM DIPL PHYS DR ,  WUNSCH GERD DIPL CHEM DR ,  DEIGNER PAUL DR ,  MUELLER FRANZ-JOSEF DIPL CHEM ,  LOESER WERNER DIPL ING DR ,  STECK WERNER DIPL CHEM DR

IPC: C07F15/00 ,  C23C18/30 ,  C23C17/02 ,  C23C3/02

Abstract: A process for metallizing substrates by activation of the substrate by deposition of palladium from a palladium complex, followed by electroless metallization. The palladium is deposited on the substrate by dipping the substrate into a solution of a palladium(O) complex and decomposing this complex at from 100 DEG to 300 DEG C.

公开(公告)号：DE3026696A1

公开(公告)日：1982-02-18

申请号：DE3026696

申请日：1980-07-15

Applicant: BASF AG

Inventor： STECK WERNER DIPL CHEM DR ,  ROLLER HERMANN ,  SARNECKI WILHELM DIPL CHEM DR ,  BALZ WERNER DIPL CHEM DR

IPC: B22F1/02 ,  B22F9/24 ,  G11B5/70 ,  H01F1/06 ,  H01F1/09 ,  C23F7/02 ,  B05D5/12 ,  G11B5/62

Abstract: Ferromagnetic metal particles, consisting essentially of iron and comprising a core, containing not less than 85% by weight of metallic iron, and an iron oxide plus chromium oxide surface layer surrounding this core, which layer additionally contains one or more elements selected from the group comprising zinc, phosphorus in the form of phosphate, aluminum, calcium, strontium, barium, cadmium, lead, cobalt and nickel in a total amount of not more than 9.5% by weight, based on the total amount of the metal particles, and a process for the production of such particles.

公开(公告)号：DE3021111A1

公开(公告)日：1981-12-17

申请号：DE3021111

申请日：1980-06-04

Applicant: BASF AG

Inventor： SIEGLE HANS JOERG DIPL ING DR ,  REICH HANS HEINER DIPL CHEM DR ,  AUTZEN HORST DIPL CHEM DR ,  STECK WERNER DIPL CHEM DR ,  LOESER WERNER DIPL ING DR ,  HETZEL ECKHARD DIPL ING ,  OHLINGER MANFRED DIPL CHEM DR

IPC: B01J8/38 ,  B22F9/22 ,  F27B15/02 ,  H01F1/06 ,  F27B15/08

Abstract: A process for the preparation of acicular ferromagnetic metal particles, consisting essentially of iron, by reducing acicular iron oxides and/or iron oxide hydroxides, which are either pure or are modified with conventional foreign metal ions, by means of a gaseous reducing agent in a fluidized bed furnace in which a stirrer is provided immediately above the fluidizing grid.

公开(公告)号：DE2935444A1

公开(公告)日：1981-03-19

申请号：DE2935444

申请日：1979-09-01

Applicant: BASF AG

Inventor： SARNECKI WILHELM DIPL CHEM DR ,  MAROSI LASZLO DIPL CHEM DR ,  AUTZEN HORST DIPL CHEM DR ,  OHLINGER MANFRED DIPL CHEM DR ,  STECK WERNER DIPL CHEM DR

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

Abstract: A process for the manufacture of acicular ferrimagnetic iron oxide by heating iron(III) oxide or iron(III) oxide hydroxide at 220 DEG -460 DEG C. under a water vapor partial pressure of not less than 30 mbar, reducing the resulting product to magnetite by means of hydrogen and/or CO and/or an organic compound which can decompose in the presence of iron oxide, and then oxidizing the magnetite with an oxygen-containing gas to give acicular ferrimagnetic iron oxide of the formula FeOX, where X is from 1.33 to 1.50.

公开(公告)号：DE2907255A1

公开(公告)日：1980-09-04

申请号：DE2907255

申请日：1979-02-24

Applicant: BASF AG

Inventor： STECK WERNER DIPL CHEM DR ,  RUDOLF PETER DIPL CHEM DR ,  HUEBNER WERNER DIPL ING ,  AUTZEN HORST DIPL CHEM DR ,  JAKUSCH HELMUT DIPL PHYS DR ,  SCHAEFER DIETER DIPL CHEM DR ,  VAETH GUENTER

IPC: B22F9/22 ,  C01G49/02 ,  C09D5/23 ,  C09D7/12 ,  G11B5/706 ,  H01F1/06 ,  C01G49/00 ,  G11B5/62

公开(公告)号：DE2905351A1

公开(公告)日：1980-08-21

申请号：DE2905351

申请日：1979-02-13

Applicant: BASF AG

Inventor： RUDOLF PETER ,  STECK WERNER DIPL CHEM DR ,  JAKUSCH HELMUT DIPL PHYS DR ,  VAETH GUENTER ,  JAECKH CHRISTOF DIPL CHEM DR

IPC: C01G49/06 ,  G11B5/68 ,  G11B5/706 ,  H01F1/11 ,  C01G49/00 ,  G11B5/62

Abstract: A process for the manufacture of acicular magnetic iron oxide consisting of a core of gamma-iron(III) oxide and a ferrite shell which contains, based on the total amount of magnetic material, from 0.2 to 12 percent by weight of cobalt(II) ions and from 0.1 to 15 percent by weight of iron(II) ions, wherein a solution containing cobalt(II) hydroxide and iron(II) hydroxide is applied to acicular gamma-iron(III) oxide particles and the latter are heated at 100 DEG -220 DEG C.

公开(公告)号：DE2735316A1

公开(公告)日：1979-02-08

申请号：DE2735316

申请日：1977-08-05

Applicant: BASF AG

Inventor： BRODT RUDOLF DIPL CHEM DR ,  JAKUSCH HELMUT DIPL PHYS DR ,  KOESTER EBERHARD DIPL PHYS DR ,  LOESER WERNER DIPL ING DR ,  OHLINGER MANFRED DIPL CHEM DR ,  SARNECKI WILHELM DIPL-CHEM DR ,  STECK WERNER DIPL CHEM 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.