公开(公告)号：DE3044340A1

公开(公告)日：1982-06-24

申请号：DE3044340

申请日：1980-11-25

Applicant: BASF AG

Inventor： OHLINGER MANFRED DIPL CHEM DR ,  REICHERT HANS DIPL ING DR ,  VAETH GUENTER ,  FAULHABER FRIEDRICH RICHARD DI ,  AUTZEN HORST DIPL CHEM DR ,  RUDOLF PETER DIPL CHEM DR ,  WERTHER JOACHIM DIPL ING DR

IPC: C01G49/02 ,  C01G49/06 ,  G11B5/706 ,  H01F1/11 ,  G11B5/62

公开(公告)号：DE2805405A1

公开(公告)日：1979-08-16

申请号：DE2805405

申请日：1978-02-09

Applicant: BASF AG

Inventor： AUTZEN HORST DIPL CHEM DR ,  MOTZ HERBERT DIPL ING DR ,  RUDOLF PETER DIPL CHEM DR ,  SARNECKI WILHELM DIPL CHEM DR ,  STECK WERNER DIPL CHEM DR ,  VAETH GUENTER

IPC: C01G49/06 ,  G11B5/706 ,  C01G49/02 ,  G11B5/62

Abstract: A process for the manufacture of acicular ferrimagnetic iron oxide by converting acicular iron(III) oxide hydroxide at from 300 DEG to 650 DEG C., by treatment with an organic compound which decomposes in this temperature range in the presence of iron oxide, the iron(III) oxide hydroxide used for the reaction being a lepidocrocite which has been heat-treated at from 300 DEG to 700 DEG C.

公开(公告)号：DE2714589A1

公开(公告)日：1978-10-12

申请号：DE2714589

申请日：1977-04-01

Applicant: BASF AG

Inventor： OHLINGER MANFRED DR ,  STRITZINGER HEINZ DIPL ING ,  VAETH GUENTER ,  WETTSTEIN EUGEN

IPC: C09D5/23 ,  G11B5/845 ,  G11B5/68

Abstract: Magnetic recording material, e.g. tape, is made using a substrate for a consolidated layer of fine, acicular, magnetic iron oxide dispersed in a polymer binder dissolved in an organic solvent. Oxide is mixed with 5-100% of the binder for 2-24 hrs. in a rotating vessel of the usual type employed to mix solids; and mixing is at a temp. below the softening point of the binder. The mix obtd. is then processed with the remainder of the binder, the solvent, and further addns., in a known man manner to make a dispersion applied as a thin, uniform layer, with simultaneous magnetic alignment of oxide, onto the substrate; the solvent is then evaporated to consolidate layer. Used esp. in the mfr. of magnetic recording tape. An economic process of obtaining a high packing density of oxide without impairing the magnetic properties of that oxide.

公开(公告)号：AU8654275A

公开(公告)日：1977-05-19

申请号：AU8654275

申请日：1975-11-12

Applicant: BASF AG

Inventor： FISCHER KARL ,  VAETH GUENTER ,  BACHMANN RUDOLF ,  WUERTELE LOTHAR ,  LEHNER AUSUST ,  HARTMANN HEINRICH ,  BAUER GERHARD ,  SPOOR HERBERT

IPC: C08G18/10 ,  C08G18/66 ,  C08G18/32 ,  C08G18/76 ,  C14C11/00

公开(公告)号：DE2550307A1

公开(公告)日：1977-05-18

申请号：DE2550307

申请日：1975-11-08

Applicant: BASF AG

Inventor： OHLINGER MANFRED DIPL CHEM DR ,  SCHOENAFINGER EDUARD DIPL CHEM ,  SCHNEIDER WALTER ,  STRITZINGER HEINZ DIPL ING ,  VAETH GUENTER

IPC: C01G49/06 ,  G11B5/706 ,  H01F1/10 ,  H01F1/11 ,  C09C1/24

Abstract: Acicular gamma-iron(III) oxide is manufactured by reacting an iron(II) salt solution with an aqueous solution of an alkali metal hydroxide and oxidizing the resulting suspension of iron(II) hydroxide in three stages. In a first stage, at most from 0.1 to 4% by weight of the amount of iron(II) hydroxide originally present is oxidized in the course of from 0.1 to 4 hours, in a second stage from 10 to 25% by weight of the said original amount are oxidized in the course of from 1.5 to 6 hours and in a third stage the remaining amount is oxidized. After the oxidation, the goethite formed is reduced to magnetite and the latter is then oxidized to acicular gamma-iron(III) oxide.

公开(公告)号：CA995069A

公开(公告)日：1976-08-17

申请号：CA188969

申请日：1973-12-27

Applicant: BASF AG

Inventor： HARTMANN HANS J ,  VAETH GUENTER ,  KOPKE HELMUT

IPC: C09D5/23 ,  G11B5/70 ,  G11B5/702 ,  G11B5/706 ,  G11B5/708

公开(公告)号：DE2455288A1

公开(公告)日：1976-06-24

申请号：DE2455288

申请日：1974-11-22

Applicant: BASF AG

Inventor： VAETH GUENTER ,  FRISCHMANN HARALD DR ,  HARTMANN HANS-JOERG DIPL ING D ,  GUTERMANN WINFRIED

IPC: C08K5/101 ,  C09D5/23 ,  G11B5/702 ,  G11B5/71 ,  H01B3/30 ,  G11B5/68

公开(公告)号：DE2442762A1

公开(公告)日：1976-03-25

申请号：DE2442762

申请日：1974-09-06

Applicant: BASF AG

Inventor： VAETH GUENTER ,  BACHMANN RUDOLF DIPL CHEM DR ,  HARTMANN HEINRICH DIPL CHEM DR ,  HARTMANN HANS-JOERG DIPL ING D ,  SPOOR HERBERT DIPL CHEM DR ,  UHL KARL DIPL ING DR ,  LEHNER AUGUST ING GRAD ,  MOTZ HERBERT DIPL ING DR

IPC: C08G18/00 ,  C08G18/65 ,  C08G18/66 ,  C09D5/23 ,  G11B5/702 ,  G11B5/68 ,  C09D3/72

公开(公告)号：DE2318910A1

公开(公告)日：1974-10-31

申请号：DE2318910

申请日：1973-04-14

Applicant: BASF AG

Inventor： VAETH GUENTER ,  BACHMANN RUDOLF DIPL CHEM DR ,  SENKPIEL WERNER DIPL CHEM DR ,  HARTMANN HANS-JOERG DIPL ING D ,  FALK ROLAND DIPL CHEM DR ,  MOTZ HERBERT DIPL ING DR

IPC: C09D5/23 ,  G11B5/702 ,  G11B5/68

Abstract: The invention relates to magnetic recording media comprising a non-magnetic base and, applied thereto, a firmly adhering magnetic coating based on a finely divided magnetic pigment and a special binder mixture. This binder mixture consists essentially of 20 to 90 percent by weight of an elastomeric polyurethane which is soluble in a volatile organic solvent, is practically free of isocyanate groups and has been obtained from a linear, aliphatic polyester or polyether and a diisocyanate of 6 to 24 carbon atoms, and of 10 to 80 percent by weight of a vinyl chloride copolymer which contains 50 to 90 percent by weight of vinyl chloride units and 10 to 50 percent by weight of units of one or more diesters of maleic acid with an alcohol of 1 to 3 carbon atoms, or of the reaction product of this binder mixture with a polyisocyanate of 6 to 50 carbon atoms. Magnetic coatings containing such a binder mixture are distinguished by improved surface hardness coupled with improved orientability of the magnetic particles, as a result of which such recording media are particularly suitable for modern video- and audio-recording instruments.

公开(公告)号：DE2300020A1

公开(公告)日：1974-07-25

申请号：DE2300020

申请日：1973-01-02

Applicant: BASF AG

Inventor： HARTMANN HANS JOERG DR ,  VAETH GUENTER ,  KOPKE HELMUT

IPC: C09D5/23 ,  G11B5/70 ,  G11B5/702 ,  G11B5/706 ,  G11B5/708 ,  G11B5/68