公开(公告)号：DE3379946D1

公开(公告)日：1989-07-06

申请号：DE3379946

申请日：1983-06-20

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

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：DE3472727D1

公开(公告)日：1988-08-18

申请号：DE3472727

申请日：1984-12-10

Applicant: BASF AG

Inventor： STECK WERNER DR ,  SARNECKI WILHELM DR ,  JAKUSCH HELMUT DR ,  MAROSI LASZLO DR

IPC: C01G49/00 ,  C01G49/02 ,  C01G51/00 ,  C01G51/04 ,  G11B5/706 ,  H01F1/10 ,  H01F1/11

公开(公告)号：DE3470810D1

公开(公告)日：1988-06-01

申请号：DE3470810

申请日：1984-12-10

Applicant: BASF AG

Inventor： STECK WERNER DR ,  JAKUSCH HELMUT DR ,  MAROSI LASZLO DR

IPC: C01G49/00 ,  C01G49/02 ,  C01G51/04 ,  G11B5/706 ,  H01F1/10 ,  H01F1/11

公开(公告)号：DE3426366A1

公开(公告)日：1986-01-23

申请号：DE3426366

申请日：1984-07-18

Applicant: BASF AG

Inventor： MELZER MILENA ,  SCHNEIDER NORBERT ,  JAKUSCH HELMUT DR ,  BALZ WERNER DR ,  KOESTER EBERHARD DR ,  TRAPP HORST DR ,  RICKER ERNST DR

IPC: G11B5/702 ,  C09D5/23 ,  C09D175/06 ,  G11B5/70 ,  G11B5/842

Abstract: Magnetic recording media are produced by preparing a dispersion consisting of finely divided magnetic material, a dispersant, the conventional additives and a solution or a dispersion of a polymeric binder, applying the dispersion in the form of a layer onto a non-magnetizable base, orienting the anisotropic magnetic material by means of a magnetic field and drying the applied layer, by a process in which the dispersant employed is obtained by reacting A. from 70 to 95 parts by weight of a reaction product of I. from 0.5 to 1.5 moles of an oxoalcohol of 6 to 20 carbon atoms, II. from 6 to 18 moles of ethylene oxide and III. from 2 to 10 moles of propylene oxide, with B. from 5 to 30 parts by weight of a polyphosphoric acid having a P2O5 content of from 80 to 88%.

公开(公告)号：DE3345531A1

公开(公告)日：1985-06-27

申请号：DE3345531

申请日：1983-12-16

Applicant: BASF AG

Inventor： STECK WERNER DR ,  JAKUSCH HELMUT DR ,  MAROSI LASZLO DR

IPC: C01G49/00 ,  C01G49/02 ,  C01G51/04 ,  G11B5/706 ,  H01F1/10 ,  H01F1/11 ,  B05D5/12 ,  G11B5/62 ,  H01F10/18

公开(公告)号：DE3322746A1

公开(公告)日：1985-01-03

申请号：DE3322746

申请日：1983-06-24

Applicant: BASF AG

Inventor： BALZ WERNER DR ,  BAUR REINHOLD DR ,  FESER RAINER DR ,  JAKUSCH HELMUT DR ,  KOVACS JENOE DR ,  OHLINGER MANFRED DR ,  RUDOLF PETER DR

IPC: G11B5/706 ,  G11B5/714 ,  G11B5/64 ,  G11B5/72

Abstract: The invention relates to a magnetic recording base made of a nonmagnetic base material and a magnetic layer which is applied thereto and is essentially composed of anisotropic magnetic materials which are finely dispersed in an inorganic polymer and are composed of a mixture of needle-shaped cobalt-modified iron oxide and chromium dioxide.

公开(公告)号：DE3063008D1

公开(公告)日：1983-06-16

申请号：DE3063008

申请日：1980-02-07

Applicant: BASF AG

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

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

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：DE3061463D1

公开(公告)日：1983-02-03

申请号：DE3061463

申请日：1980-02-04

Applicant: BASF AG

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

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

公开(公告)号：DE3408000C2

公开(公告)日：1994-05-19

申请号：DE3408000

申请日：1984-03-03

Applicant: BASF AG

Inventor： GRAU WERNER DR ,  JAKUSCH HELMUT DR ,  KOVACS JENOE DR ,  OHLINGER MANFRED DR ,  RUDOLF PETER DR ,  ROLLER HERMANN

IPC: G11B5/708

公开(公告)号：DE58907173D1

公开(公告)日：1994-04-14

申请号：DE58907173

申请日：1989-10-19

Applicant: BASF AG

Inventor： HACK JOACHIM ,  GRAU WERNER DR ,  SICKMUELLER WERNER ,  MANNSPERGER HEINRICH DR ,  JAKUSCH HELMUT DR ,  SCHOMANN KLAUS DIETER DR ,  HAMMERSCHMITT PETER ,  BROSIUS SIBYLLE DR ,  FEUERHERD KARL-HEINZ DR ,  ALBERT BERNHARD DR ,  SCHMITT MICHAEL DR ,  ACKER MICHAEL DR

IPC: G11B5/41 ,  G11B5/54 ,  G11B7/005 ,  G11B11/105 ,  G11B19/04 ,  G11B19/06 ,  G11B33/14