公开(公告)号：DE3374480D1

公开(公告)日：1987-12-17

申请号：DE3374480

申请日：1983-07-23

Applicant: BASF AG

Inventor： STECK WERNER DR ,  RUDOLF PETER DR ,  SARNECKI WILHELM DR ,  LOESER WERNER DR ,  KOVACS JENOE DR ,  JAKUSCH HELMUT DR

IPC: G11B5/706 ,  B22F1/00 ,  B22F9/22 ,  C01G49/02 ,  C09D5/23 ,  C09D7/12 ,  H01F1/06

Abstract: Acicular ferromagnetic metal particles consisting essentially of iron are prepared by a process wherein acicular iron(III) oxide hydroxide provided with a shape-stabilizing surface coating, or iron(III) oxide obtained therefrom by dehydration, is reduced by means of a decomposable organic compound and hydrogen.

公开(公告)号：DE3228669A1

公开(公告)日：1984-02-02

申请号：DE3228669

申请日：1982-07-31

Applicant: BASF AG

Inventor： STECK WERNER DR ,  RUDOLF PETER DR ,  SARNECKI WILHELM DR ,  LOESER WERNER DR ,  KOVACS JENOE DR ,  JAKUSCH HELMUT DR

IPC: G11B5/706 ,  B22F1/00 ,  B22F9/22 ,  C01G49/02 ,  C09D5/23 ,  C09D7/12 ,  H01F1/06 ,  B22F9/18 ,  C01G49/00 ,  G11B5/62

Abstract: Acicular ferromagnetic metal particles consisting essentially of iron are prepared by a process wherein acicular iron(III) oxide hydroxide provided with a shape-stabilizing surface coating, or iron(III) oxide obtained therefrom by dehydration, is reduced by means of a decomposable organic compound and hydrogen.

公开(公告)号：DE3800197A1

公开(公告)日：1989-07-20

申请号：DE3800197

申请日：1988-01-07

Applicant: BASF AG

Inventor： LOESER WERNER DR ,  DOMAS FRIEDRICH ,  ZISSEL GEORG ,  KUERTEN HERIBERT DR ,  BENDER RAINER DR

IPC: B24B37/00 ,  G11B5/84

Abstract: The substrate plates, after facing, are finished with lapping discs, with the addition of a polishing fluid composed of an aqueous solution with aluminium oxide powder and organic additives, the lapping discs being provided with a covering made from an elastic material.

公开(公告)号：DE3804764A1

公开(公告)日：1988-09-01

申请号：DE3804764

申请日：1988-02-16

Applicant: BASF AG

Inventor： BOEHM UDO ,  LOESER WERNER DR ,  DOERR KURT DR ,  SCHULZE AXEL-RUEDIGER DR

IPC: C23C18/16 ,  C25D17/08 ,  G11B5/84

Abstract: In the production of magnetic storage plates, substrate plates of metal are subjected to a number of treatments in baths for cleaning, activating and coating the plate surface. For the simultaneous treatment of a multiplicity of plates, use is made of a rack having one or more rods (1), on which a plurality of substrate plates (2) are arrnaged in series through their central opening and which are releasibly fastened at their ends in securing means (3). For rinsing the plates after each treatment, the rack is provided with a shower device (4), which is arranged above the rods and is movably connected to a water connection. Conveying and lifting devices bring the rack to the bath tanks and into the treatment bath.

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：DE3774969D1

公开(公告)日：1992-01-16

申请号：DE3774969

申请日：1987-08-22

Applicant: BASF AG

Inventor： RICHTER JUERGEN DR ,  GRAU WERNER DR ,  MAURER GERD PROF DR ,  DOMAS FRIEDRICH ,  LOESER WERNER DR ,  BENDER RAINER DR ,  SCHULZE AXEL-RUEDIGER DR ,  DOERR KURT DR

IPC: G11B5/73 ,  G11B5/84 ,  G11B5/704

Abstract: Method of surface treating Ni-coated Al substrates to produce a polished and texture surface of roughness depth Rt of 0.04-0.1um, a average roughness depth R2 of 0.04-0.1um and an average roughness value Ra of 0.0065-0.0095, consists of lap-polishing both sides of the substrate with a polishing material to remove 2-4um of the surface layer and produce an average roughness value of 0.04-0.06um. Without removing the substrate from the polishing machine, a second process using a polishing material having 3-10 times the grain size is effected to produce an essentially paddle wheel structured texture.

公开(公告)号：DE3160523D1

公开(公告)日：1983-08-04

申请号：DE3160523

申请日：1981-05-08

Applicant: BASF AG

Inventor： SIEGLE HANSJOERG DR ,  REICH HANS HEINER DR ,  AUTZEN HORST DR ,  STECK WERNER DR ,  LOESER WERNER DR ,  HETZEL ECKHARD ,  OHLINGER MANFRED DR

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

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：DE3375849D1

公开(公告)日：1988-04-07

申请号：DE3375849

申请日：1983-04-28

Applicant: BASF AG

Inventor： MELZER MILENA ,  JAKUSCH HELMUT ,  GRAU WERNER DR ,  KOESTER EBERHARD DR ,  LOESER WERNER DR ,  POLKE REINHARD DR ,  SCHAEDEL GUENTER DR ,  OHLINGER MANFRED DR ,  VAETH GUENTER

IPC: G11B5/70 ,  C09D5/23 ,  G11B5/68 ,  G11B5/706 ,  G11B5/84 ,  H01F1/11 ,  H01F1/113 ,  H01F1/44

Abstract: A magnetic dispersion which can be applied to a non-magnetic base to produce a recording medium is prepared by dispersing a magnetically anisotropic material in a polymer binder and in an organic solvent by a method wherein the magnetically anisotropic material is worked in a jet mill before and/or during dispersing.

公开(公告)号：DE3629582A1

公开(公告)日：1988-03-03

申请号：DE3629582

申请日：1986-08-30

Applicant: BASF AG

Inventor： RICHTER JUERGEN DR ,  GRAU WERNER DR ,  MAURER GERD DR ,  DOMAS FRIEDRICH ,  LOESER WERNER DR ,  BENDER RAINER DR ,  SCHULZE AXEL-RUEDIGER DR ,  DOERR KURT DR

IPC: G11B5/73 ,  G11B5/84

Abstract: Disk-shaped nickel-plated aluminum substrates which are used as bases in the production of magnetic recording disks having a magnetizable metallic layer are surface treated by polishing and texturing.

公开(公告)号：DE2220964A1

公开(公告)日：1973-11-08

申请号：DE2220964

申请日：1972-04-28

Applicant: BASF AG

Inventor： DEIGNER PAUL DR ,  LOESER WERNER DR ,  VOIGT JOCHEN ,  BACHMANN RUDOLF DR ,  STABENOW JOACHIM DR ,  UHL KARL DR-ING ,  KITTLER WOLFRAM DR-ING

IPC: B05D7/16 ,  G11B5/64 ,  G11B5/72

Abstract: 1420692 Magnetic recording tape BADISCHE ANILIN- & SODA-FABRIK AG 27 April 1973 [28 April 1972] 20074/73 Heading B2E A thermostable rigid base plated with a firmly adhering film of ferromagnetic metallic material containing cobalt has applied thereto a layer from a solution of at least one film-forming organic coating resin in a volatile solvent, the layer in dried and unbaked condition being not more than 3000A thick, and drying and baking being effected at 200-300‹C for 1-15 hours. Specified resins are polycarbonates, polyurethanes, acrylic polymers, polyglycidal ethers and esters cured with polyamines and polyaminoamides and phenol-amine resins. The ferromagnetic metal may be Co-P, Co-B, Co- Ni, Co-Fe-Ni alloys. Ketones, ethers and hydrocarbons are typical volatile solvents.