公开(公告)号：DE59006121D1

公开(公告)日：1994-07-21

申请号：DE59006121

申请日：1990-08-14

Applicant: BASF AG

Inventor： OHLINGER MANFRED DR ,  KOVACS JENOE DR

IPC: C09D5/23 ,  C09D7/12 ,  G11B5/706

Abstract: The invention relates to magnetic recording media comprising a nonmagnetic substrate and a magnetisable layer arranged thereon, essentially consisting of a magnetic material from the group comprising the cobalt-modified iron oxides and the hexagonal ferrites and inorganic supporting substances finely distributed in organic binders, the inorganic supporting substance used being ferromagnetic chromium dioxide.

公开(公告)号：DE58907750D1

公开(公告)日：1994-07-07

申请号：DE58907750

申请日：1989-08-19

Applicant: BASF AG

Inventor： MUELLER MICHAEL WOLFGANG DR ,  SCHWAB EKKEHARD DR ,  AUWETER HELMUT DR ,  FESER RAINER DR ,  HUEBNER WERNER ,  MUELLER NORBERT DR ,  OHLINGER MANFRED DR ,  DIKOW HERMANN DR

IPC: C01G37/027 ,  C09D5/23 ,  C09D7/12 ,  G11B5/706 ,  H01F1/11

Abstract: The invention relates to a chromium dioxide material, consisting of needle-shaped, ferromagnetic chromium dioxide particles having a non-magnetic, hydrogenous surface protective layer, which is distinguished by an improved stability against chemical decomposition, a process for its preparation and magnetic recording material containing this chromium dioxide with high long-term climatic stability of the remanent magnetisation.

公开(公告)号：DE58901102D1

公开(公告)日：1992-05-14

申请号：DE58901102

申请日：1989-01-28

Applicant: BASF AG

Inventor： MAIR GUNTHER DR ,  OHLINGER MANFRED DR ,  FESER RAINER DR

IPC: C01G49/00 ,  C01G49/02 ,  C04B35/26 ,  H01F1/11

公开(公告)号：DE3803467A1

公开(公告)日：1989-08-17

申请号：DE3803467

申请日：1988-02-05

Applicant: BASF AG

Inventor： MAIR GUNTHER DR ,  OHLINGER MANFRED DR ,  FESER RAINER DR

IPC: C01G49/00 ,  C01G49/02 ,  C04B35/26 ,  H01F1/11

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：DE3718299A1

公开(公告)日：1988-12-15

申请号：DE3718299

申请日：1987-05-30

Applicant: BASF AG

Inventor： MUELLER NORBERT DR ,  OHLINGER MANFRED DR ,  FESER RAINER DR ,  BOETTCHER BERNHARD DR ,  RUDOLF PETER DR ,  HUEBNER WERNER

IPC: C01G37/027 ,  G11B5/706 ,  H01F1/11 ,  C09C1/34

Abstract: This chromium dioxide is prepared by a finishing treatment of the surface of the chromium dioxide formed by a reductive treatment using adsorbed mono- or polybasic hydroxy carboxylic acids.

公开(公告)号：DE3564504D1

公开(公告)日：1988-09-22

申请号：DE3564504

申请日：1985-05-25

Applicant: BASF AG

Inventor： VAETH GUENTER ,  HEINZ ROBERT ING GRAD ,  OHLINGER MANFRED DR ,  RUDOLF PETER DR ,  HOFMANN FRIEDBERT DR DIPL ING ,  MELZER MILENA DIPL ING

IPC: G11B5/84

公开(公告)号：DE3610411A1

公开(公告)日：1987-10-01

申请号：DE3610411

申请日：1986-03-27

Applicant: BASF AG

Inventor： RUDOLF PETER DR ,  OHLINGER MANFRED DR ,  MUELLER NORBERT DR ,  HUEBNER WERNER

IPC: H01F1/11 ,  C01G37/027 ,  G11B5/706 ,  C01G37/033

公开(公告)号：DE3361135D1

公开(公告)日：1985-12-12

申请号：DE3361135

申请日：1983-01-22

Applicant: BASF AG

Inventor： RUDOLF PETER DR ,  KOVACS JENOE DR ,  VAETH GUENTER ,  OHLINGER MANFRED DR

IPC: C01G49/00 ,  C01G49/06 ,  C09D5/23 ,  G11B5/62 ,  G11B5/706 ,  H01F1/11

Abstract: A modified acicular ferrimagnetic iron oxide which consists of a core of gamma-iron(III) oxide and a surrounding shell of gamma-iron(III) oxide modified by tin dioxide and carbon, and a process for its preparation.

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.