公开(公告)号：DE3240063A1

公开(公告)日：1983-05-26

申请号：DE3240063

申请日：1982-10-29

Applicant: BASF AG

Inventor： LECHNER HILMAR DIPL ING ,  KOESTER EBERHARD DIPL PHYS DR ,  SCHOETTLE KLAUS DIPL ING ,  HAUCK KARL

IPC: G11B5/845 ,  G11B5/84 ,  B05D5/12 ,  H01F10/00

Abstract: Apparatus for producing a magnetogram carrier, comprising a device for applying one or more layers of a magnetic dispersion to a carrier web (1) and a control magnet arrangement (2), displaceably mounted between the applying device and a drying device for the coated carrier web, for aligning the magnetically anisotropic magnetic particles in the magnetic dispersion in a preferred direction parallel to the plane of the carrier web.

公开(公告)号：GB1599712A

公开(公告)日：1981-10-07

申请号：GB1956278

申请日：1978-05-15

Applicant: BASF AG

Inventor： HUEBNER WERNER DIPL ING ,  HARTMANN JOB-WERNER DIPL CHEM ,  DOMAS FRIEDRICH DIPL ING ,  NAGEL PETER DIPL ING ,  DEIGNER PAUL DR ,  KOESTER EBERHARD DIPL PHYS DR ,  HAUSER HANS

IPC: G11B5/84 ,  G11B5/842 ,  G11B5/848 ,  B01F7/10

Abstract: A process and apparatus for the manufacture of magnetic recording media, in which, immediately before the magnetic dispersion is applied to a base, the dispersion is subjected to shear by means of a disc rotatably mounted in a housing, by introducing it at the center of rotation of the disc and forcing it through a gap formed between the face of the disc and the wall of the housing, which gap tapers toward the rim of the disc.

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：DE2945203A1

公开(公告)日：1981-06-04

申请号：DE2945203

申请日：1979-11-09

Applicant: BASF AG

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

IPC: G11B5/706 ,  C01G49/06 ,  G11B5/62

公开(公告)号：DE2928096A1

公开(公告)日：1981-02-05

申请号：DE2928096

申请日：1979-07-12

Applicant: BASF AG

Inventor： FELLEISEN PETER DIPL ING ,  MAYER DIETER DR ,  KOESTER EBERHARD DIPL PHYS DR ,  DOMAS FRIEDRICH DIPL ING ,  DEIGNER PAUL DIPL CHEM DR

IPC: C09D5/23 ,  G11B5/70 ,  G11B5/716 ,  G11B5/718 ,  G11B5/84 ,  G11B5/842 ,  G11B5/68 ,  H01F10/00 ,  B05D5/12

Abstract: A magnetic recording disk comprising a non-magnetic substrate and two or more firmly adhering magnetizable layers applied to one or both sides thereof, the layer located directly on the substrate being magnetically isotropic, while the second layer and any additional layers exhibit orientation of the anisotropic magnetic particles parallel to the substrate and to the envisaged recording direction.

公开(公告)号：DE2705967A1

公开(公告)日：1978-08-17

申请号：DE2705967

申请日：1977-02-12

Applicant: BASF AG

Inventor： BECKER HANS-JUERGEN DIPL CHEM ,  JAECKH CHRISTOF DIPL CHEM DR ,  KOESTER EBERHARD DIPL PHYS DR ,  LOESER WERNER DIPL ING DR ,  OHLINGER MANFRED DIPL CHEM DR ,  STECK WERNER DIPL CHEM DR

IPC: C01G49/02 ,  C01G49/00 ,  C01G49/06 ,  G11B5/706 ,  H01F1/11 ,  H01F1/117

Abstract: A process for the manufacture of an acicular magnetic iron oxide containing from 0.5 to 10 percent by weight of cobalt and up to 24 percent by weight of divalent iron, each based on the amount of iron(III) oxide, wherein an aqueous suspension of gamma-iron(III) oxide, containing cobalt(II) and iron(II) ions, the suspension having a hydroxyl ion concentration of more than 3.6x10-6 moles/liter, is heated at from 50 DEG to 100 DEG C. for at least 15 minutes, and the resulting precipitate is filtered off, washed until neutral, dried at below 100 DEG C. and thereafter heated at from 100 DEG to 200 DEG C. The products thus obtained give, even when their cobalt content is low, a very high coercive force, while the effect of temperature on the coercive force and residual induction is very slight.

公开(公告)号：DE2639250A1

公开(公告)日：1978-03-09

申请号：DE2639250

申请日：1976-09-01

Applicant: BASF AG

Inventor： BECKER HANS-JUERGEN DIPL ING D ,  KOESTER EBERHARD DIPL PHYS DR ,  OHLINGER MANFRED DIPL CHEM DR ,  STECK WERNER DIPL CHEM DR ,  SCHOENAFINGER EDUARD DIPL CHEM

IPC: C01G49/06 ,  C01G49/00 ,  G11B5/706 ,  H01F1/34

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：DE2442707A1

公开(公告)日：1976-03-18

申请号：DE2442707

申请日：1974-09-06

Applicant: BASF AG

Inventor： KOESTER EBERHARD DIPL PHYS DR ,  NAGEL PETER DIPL ING ,  JANSEN GERHARD DR ,  WITTKAMP HEINRICH DIPL ING ,  MAYER DIETER DR

IPC: G11B15/295 ,  G11B15/67 ,  G11B15/66 ,  G11B5/62 ,  G11B23/26

Abstract: The threading leader consists of at lest partly of magnetisable material and the winding-on member is equipped with means which generate a magnetic field. These means are used to pull the threading leader onto the winding-on member and lock it with the latter. The threading leader can be guided between sound and winding shafts fitted with discs for fixing on the periphery of the disc of the winding shaft. The threading leader can be constructed as a metal foil strip connected to the magnetic tape. It can also be fitted with a plastic foil as carrier for a support of magnetisable material or metal oxide.

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.