公开(公告)号：DE3576010D1

公开(公告)日：1990-03-15

申请号：DE3576010

申请日：1985-10-10

Applicant: BASF AG

Inventor： KOHL ALBERT ,  MELZER MILENA ,  LEHNER AUGUST ,  SCHNEIDER NORBERT ,  KOESTER EBERHARD DR ,  BALZ WERNER DR ,  SOMMERMANN FRIEDRICH DR ,  RICKER ERNST DR

IPC: G11B5/702 ,  C09D5/23 ,  C09D127/04 ,  C09D127/06 ,  C09D163/00 ,  C09D167/00 ,  C09D171/00 ,  C09D171/12 ,  C09D175/00 ,  C09D175/04 ,  C10M105/58 ,  C10N40/18 ,  G11B5/708 ,  G11B5/71

Abstract: In magnetic recording media consisting of a non-magnetic base and, bonded on top of this, one or more magnetizable layers based on magnetic material finely dispersed in a polymer binder, a lubricant and further conventional additives, the lubricant used is a triethanolamine esterified with oleic acid.

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：DE3072056D1

公开(公告)日：1988-01-07

申请号：DE3072056

申请日：1980-12-13

Applicant: BASF AG

Inventor： REIMER KARL-JUERGEN ,  PFEFFERKORN DIETMAR ,  KOESTER EBERHARD DR ,  ANDRIESSEN WILHELMUS ,  WAGNER HERBERT DR ,  WAGNER WERNER DR ,  KREIMES NORBERT

IPC: G11B23/04 ,  G11B23/087

Abstract: A cassette system for any type of recording medium in strip or tape form, such as films and magnetic tapes, consists essentially of a housing whose external dimensions match those of a conventional type of cassette, and a protective holder for the recording medium which is wound into at least one roll. The housing and the holder are separate or separable members and can be fitted together. Both are provided with means for inserting the holder into the housing in the correct position, and for introducing the recording medium into the transport apparatus. The housing is provided with opening and closing means. The holder can be designed to be separable from the roll of recording medium. Preferably, the housing is a precision-made article and the holder a low-cost article.

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：DE3065149D1

公开(公告)日：1983-11-10

申请号：DE3065149

申请日：1980-06-23

Applicant: BASF AG

Inventor： FELLEISEN PETER ,  MAYER DIETER DR ,  KOESTER EBERHARD DR ,  DOMAS FRIEDRICH ,  DEIGNER PAUL DR

IPC: C09D5/23 ,  G11B5/70 ,  G11B5/716 ,  G11B5/718 ,  G11B5/84 ,  G11B5/842

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：DE2434096A1

公开(公告)日：1976-02-05

申请号：DE2434096

申请日：1974-07-16

Applicant: BASF AG

Inventor： SCHNEEHAGE HENNING DR ,  WUNSCH GERD DR ,  KOESTER EBERHARD DR ,  SCHOENAFINGER EDUARD DR

IPC: B22F9/22 ,  C09C1/62 ,  H01F1/06 ,  G11B5/62

Abstract: A process for the manufacture of acicular ferromagnetic metal pigments containing iron, having a reduced field strength distribution and a steeper residual magnetization curve, by applying equivalent amounts of an alkaline earth metal cation and of a monobasic, dibasic or tribasic aliphatic carboxylic acid of up to 6 carbon atoms onto appropriate acicular iron oxides and then reducing the treated oxides.

公开(公告)号：DE3718523A1

公开(公告)日：1988-12-22

申请号：DE3718523

申请日：1987-06-03

Applicant: BASF AG

Inventor： KUPPELMAIER HARALD DR ,  STEININGER HELMUT DR ,  WIEGEMANN HANS-BERTRAM DR ,  KOESTER EBERHARD DR

IPC: B41M5/26 ,  G11B7/24 ,  G11B7/243 ,  B05D5/12

公开(公告)号：DE3727604A1

公开(公告)日：1988-05-26

申请号：DE3727604

申请日：1987-08-19

Applicant: BASF AG

Inventor： SCHNEIDER WALTER ,  KULLMANN UDO DR ,  JAKUSCH HELMUT DR ,  KOESTER EBERHARD DR ,  NERSCHBACH GERHARD ,  PFEFFERKORN DIETMAR ,  PFIRRMANN VIKTOR DR

IPC: G11B5/024 ,  G11B5/008

Abstract: At least one magnetic-tape reel (2) can be moved by means of a conveying device (3) through a long cylindrical coil (1) (air-cored coil) which can be connected to a power source. In this case, the axis of the cylindrical coil is arranged transversely with respect to the plane of the reel, so that the magnetic lines of flux run transversely with respect to the tape reel.

公开(公告)号：DE3375848D1

公开(公告)日：1988-04-07

申请号：DE3375848

申请日：1983-12-20

Applicant: BASF AG

Inventor： KOHL ALBERT ,  BALZ WERNER DR ,  MELZER MILENA ,  SCHNEIDER NORBERT ,  KOESTER EBERHARD DR ,  LEHNER AUGUST

IPC: C08F20/26 ,  C08F220/26 ,  C09D5/23 ,  C09D133/04 ,  C09D133/08 ,  C09D175/00 ,  C09D175/04 ,  G11B5/70 ,  G11B5/702

Abstract: Magnetic recording media are produced by dispersing finely divided anisotropic magnetic material and conventional additives in a solution of a polymeric binder in an organic solvent, or in an aqueous dispersion of a polymeric binder, adding a polymer based on hydrophilic ethylenically unsaturated compounds to the magnetic dispersion, applying a layer of the dispersion to a non-magnetizable base, orienting the anisotropic magnetic material in a magentic field and drying the applied layer.

公开(公告)号：AT31123T

公开(公告)日：1987-12-15

申请号：AT84106123

申请日：1980-12-13

Applicant: BASF AG

Inventor： REIMER KARL-JUERGEN ,  PFEFFERKORN DIETMAR ,  KOESTER EBERHARD DR ,  KREIMES NORBERT ,  ANDRIESSEN WILHELMUS ,  WAGNER HERBERT DR ,  WAGNER WERNER DR

IPC: G11B23/04