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：DE2535448A1

公开(公告)日：1977-02-24

申请号：DE2535448

申请日：1975-08-08

Applicant: BASF AG

Inventor： LOWENBERG GUSTAV DIPL ING ,  HARTMANN HANS-JOERG DIPL ING D ,  SCHAEFER DIETER DIPL CHEM DR ,  MOTZ HERBERT DIPL ING DR ,  JAKUSCH HELMUT DIPL PHYS DR

IPC: G11B5/708 ,  C09D5/23 ,  C09D7/12 ,  C09D131/02 ,  C09D177/00 ,  C09D177/06 ,  G11B5/70 ,  G11B5/702 ,  G11B5/68

公开(公告)号：DE2512450A1

公开(公告)日：1976-10-07

申请号：DE2512450

申请日：1975-03-21

Applicant: BASF AG

Inventor： HACK HOACHIM DIPL ING ,  SCHAEFER DIETER DIPL CHEM DR ,  MOTZ HERBERT DIPL ING DR

IPC: G11B5/708 ,  G11B5/72 ,  H01F10/02

Abstract: Magnetic recording media comprising a base and, applied thereto, at least one firmly adhering magnetic layer based on magnetic particles dispersed in a mixture of organic binders, wherein at least the uppermost magnetic layer additionally contains non-magnetic particles of precipitated silica having a primary particle diameter of from 0.02 to 0.1 mu , a secondary particle diameter of from 2 to 4 mu and a pH of from 5 to 8.

公开(公告)号：DE3213508A1

公开(公告)日：1983-10-20

申请号：DE3213508

申请日：1982-04-10

Applicant: BASF AG

Inventor： SCHAEFER DIETER DIPL CHEM DR ,  FELLEISEN PETER DIPL ING ,  DOMAS FRIEDRICH DIPL ING ,  MAYER DIETER DR

IPC: G11B5/842 ,  G11B5/84 ,  G11B5/845 ,  G11B5/68 ,  H01F41/16

公开(公告)号：DE3136982A1

公开(公告)日：1983-03-31

申请号：DE3136982

申请日：1981-09-17

Applicant: BASF AG

Inventor： BACHMANN RUDOLF DIPL CHEM DR ,  BALZ WERNER DIPL CHEM DR ,  GRAU WERNER DIPL CHEM DR ,  GUTERMANN WINFRIED ,  KOVACS JENOE DIPL CHEM DR ,  KRUCKER KARL DIPL CHEM DR ,  RUDOLF PETER ING GRAD ,  SCHAEFER DIETER DIPL CHEM DR ,  HACK JOACHIM DIPL ING

IPC: C09D5/23 ,  C09D137/00 ,  G11B5/70 ,  G11B5/702 ,  G11B5/68 ,  B05D5/12

公开(公告)号：DE3010873A1

公开(公告)日：1981-10-01

申请号：DE3010873

申请日：1980-03-21

Applicant: BASF AG

Inventor： KOESTER EBERHARD DIPL PHYS DR ,  DEIGNER PAUL DIPL CHEM DR ,  SCHAEFER DIETER DIPL CHEM DR ,  UHL KARL DIPL ING DR ,  FALK ROLAND DIPL CHEM DR

IPC: G11B5/84 ,  G11B5/845

Abstract: A device for magnetically orienting the magnetizable particles of magnetic recording media in a preferred direction, which media are obtained by applying a coating of anisotropically magnetic particles finely dispersed in a solution of an organic binder system and conventional additives to a non-magnetic base, and subsequently solidifying the coating, by the action, on the still fluid coating, of the magnetic fields produced by two E-shaped electromagnets arranged symmetrically with respect to, and in mirror-image relationship to, the plane of the said coating.

公开(公告)号：DE2846623A1

公开(公告)日：1980-05-08

申请号：DE2846623

申请日：1978-10-26

Applicant: BASF AG

Inventor： MOTZ HERBERT DIPL ING DR ,  SCHAEFER DIETER DIPL CHEM DR ,  HUEBNER WERNER DIPL ING ,  MAYER DIETER DR

IPC: G11B5/70 ,  B01F5/06 ,  B01F15/02 ,  B05D5/12 ,  C09D5/23 ,  C09D7/12 ,  G11B5/68 ,  G11B5/84 ,  G11B5/845 ,  B05D3/00

Abstract: A process for the manufacture of magnetic recording media by dispersing a mixture of particulate anisotropic magnetic material and additives in a solution of a polymeric binder in an organic solvent, compressing and then releasing the pressure on the dispersion, thereafter applying a layer of the dispersion to a non-magnetizable base, orienting the anisotropic magnetic material by means of a magnetic field, and drying the coating.

公开(公告)号：DE2459541A1

公开(公告)日：1976-07-01

申请号：DE2459541

申请日：1974-12-17

Applicant: BASF AG

Inventor： KOESTER EBERHARD DIPL PHYS DR ,  DEIGNER PAUL DR ,  FALK ROLAND DIPL CHEM DR ,  UHL KARL DIPL ING DR ,  SCHAEFER DIETER DIPL CHEM DR ,  MAYER DIETER DR ,  MOTZ HERBERT DIPL ING DR ,  FELLEISEN PETER DIPL ING

IPC: B05C11/08 ,  B05D1/40 ,  G11B5/842 ,  G11B5/84 ,  B05D5/12

Abstract: The invention relates to an improved process for the manufacture of magnetic discs carrying very thin magnetic layers, by applying a fluid dispersion of magnetic materials in a binder mixture to rigid base discs by the spin-coating process. Above the side of the base disc which is to be provided with the magnetic layer, there are arranged means which produce an aerodynamic boundary layer above the discs during rotation of the latter. This avoids the formation of surface irregularities and of coating streaks during production of the layer by spin-coating.

公开(公告)号：DE2440920A1

公开(公告)日：1976-03-11

申请号：DE2440920

申请日：1974-08-27

Applicant: BASF AG

Inventor： KOESTER EBERHARD DIPL PHYS DR ,  DEIGNER PAUL DR ,  FALK ROLAND DIPL CHEM DR ,  UHL KARL DIPL ING DR ,  SCHAEFER DIETER DIPL CHEM DR

IPC: G11B5/845 ,  G11B5/68

Abstract: A device for manufacturing magnetic recording media in which the magnetic particles in the recording layer are oriented in a preferred direction, the fluid coating applied to the base being subjected to the action of a magnetic field produced in the air gaps between the spaced apart poles of two magnetic circuits, one on each side of the coated face, arranged symmetrically with respect to the plane of the coated base, the edges of the poles adjacent to the coated base terminating in screening elements shaped in such a way that the distance between the surfaces of the screening elements facing the coated base and the coated base itself increases as the screening elements extend away from the edges of the poles. A high degree of magnetic anisotropy in the recording layer can also be obtained when the magnetic circuits are at a relatively large distance from the still fluid magnetic coating.

公开(公告)号：DE2435096A1

公开(公告)日：1976-02-12

申请号：DE2435096

申请日：1974-07-22

Applicant: BASF AG

Inventor： SCHAEFER DIETER DIPL CHEM DR ,  MOTZ HERBERT DIPL ING DR

IPC: G11B5/74 ,  G11B5/845 ,  G11B5/84