公开(公告)号：US3922439A

公开(公告)日：1975-11-25

申请号：US30667472

申请日：1972-11-15

Applicant: BASF AG

Inventor： HARTMANN HANS-JOERG ,  HARTMANN JOB-WERNER ,  FRISCHMAN HARALD ,  VAETH GUENTER

IPC: C09D5/23 ,  G11B5/702 ,  H01F10/02

CPC classification number: G11B5/7022 ,  Y10S428/90 ,  Y10T428/31565 ,  Y10T428/31576 ,  Y10T428/31609

Abstract: Magnetic recording media comprising a non-magnetic support and a magnetic layer based on a dispersion of finely divided magnetic pigment in a binder consisting of a mixture of a special soluble hydroxyl-free polyester urethane.

Abstract translation: 磁性记录介质包括非磁性载体和磁性层，该磁性层基于由特殊的可溶解的无羟基聚酯聚氨酯的混合物组成的粘合剂中的细分散的磁性颜料的分散体。

公开(公告)号：JPS61261218A

公开(公告)日：1986-11-19

申请号：JP10507986

申请日：1986-05-09

Applicant: BASF AG

Inventor： STECK WERNER ,  FESER RAINER ,  LOESER WERNER ,  RUDOLF PETER ,  VAETH GUENTER ,  JAKUSCH HELMUT ,  KOVACS JENOE

IPC: C01G49/00 ,  C01G49/06 ,  C09D5/23 ,  G11B5/706 ,  H01F1/11

公开(公告)号：DE3680146D1

公开(公告)日：1991-08-14

申请号：DE3680146

申请日：1986-04-22

Applicant: BASF AG

Inventor： OHLINGER MANFRED DR ,  VAETH GUENTER ,  HONECKER GERHARD

IPC: C01G49/06 ,  C21B13/08 ,  F27B7/32 ,  G11B5/706 ,  H01F1/11

公开(公告)号：DE3516884A1

公开(公告)日：1986-11-13

申请号：DE3516884

申请日：1985-05-10

Applicant: BASF AG

Inventor： SCHWAB EKKEHARD DR ,  STECK WERNER DR ,  RUDOLF PETER DR ,  VAETH GUENTER ,  JAKUSCH HELMUT DR ,  KOVACS JENOE DR

IPC: H01F1/06 ,  B22F1/02 ,  B22F9/22 ,  B22F9/24 ,  G11B5/706 ,  C22B5/18 ,  C01G49/02

公开(公告)号：DE3162682D1

公开(公告)日：1984-04-19

申请号：DE3162682

申请日：1981-10-12

Applicant: BASF AG

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

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

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：DE2905351A1

公开(公告)日：1980-08-21

申请号：DE2905351

申请日：1979-02-13

Applicant: BASF AG

Inventor： RUDOLF PETER ,  STECK WERNER DIPL CHEM DR ,  JAKUSCH HELMUT DIPL PHYS DR ,  VAETH GUENTER ,  JAECKH CHRISTOF DIPL CHEM DR

IPC: C01G49/06 ,  G11B5/68 ,  G11B5/706 ,  H01F1/11 ,  C01G49/00 ,  G11B5/62

Abstract: A process for the manufacture of acicular magnetic iron oxide consisting of a core of gamma-iron(III) oxide and a ferrite shell which contains, based on the total amount of magnetic material, from 0.2 to 12 percent by weight of cobalt(II) ions and from 0.1 to 15 percent by weight of iron(II) ions, wherein a solution containing cobalt(II) hydroxide and iron(II) hydroxide is applied to acicular gamma-iron(III) oxide particles and the latter are heated at 100 DEG -220 DEG C.

公开(公告)号：DE2446487A1

公开(公告)日：1976-09-02

申请号：DE2446487

申请日：1974-09-28

Applicant: BASF AG

Inventor： VAETH GUENTER ,  NAGEL PETER DIPL ING ,  HARTMANN HANS-JOERG DIPL ING D ,  UHL KARL DIPL ING DR ,  GUTERMANN WINFRIED ,  MAYER DIETER DR

IPC: G11B5/73 ,  G11B5/70 ,  B29D17/00

Abstract: Laminated magnetogram carrier consists of (1) flexible polyethylene terephthalate having a thickness of 4-36 mu m, (2) opt. a bond-promoting intermediate layer, and (3) a magnetic, image-registering layer consisting of a finely divided magnetic pigment in a binder. Layer (1) possesses an average surface roughness (Rz) of 0.05-0.20 mu m, and a max. point roughness (Rt) of is not >200 of the average surface roughness. Gives video signals having a low grass noise and a satisfactory mitte value. Percentage of reject carriers is greatly reduced.

公开(公告)号：DE3684038D1

公开(公告)日：1992-04-09

申请号：DE3684038

申请日：1986-05-03

Applicant: BASF AG

Inventor： STECK WERNER ,  FESER RAINER ,  LOESER WERNER ,  RUDOLF PETER ,  VAETH GUENTER ,  JAKUSCH HELMUT ,  KOVACS JENOE

IPC: C01G49/00 ,  C01G49/06 ,  C09D5/23 ,  G11B5/706 ,  H01F1/11

Abstract: In the prodn. of acicular Co-contg. ferromagnetic Fe oxide, (a) gamma-FeOOH seeds are produced by the acid process in a first stage from Fe(II) salt solns. by addn. of alkali and simultaneous oxidn. by introduction of air in the presence of 0.2-1.0wt.% phosphate ions w.r.t. the amt. of gamma-FeOOH end prod.; (b) these seeds are then grown to the gamma-FeOOH end prod. in a second stage at a pH of 4-5.5; and then (c) after filtering, washing and drying, this is dehydrated at 300-600 deq.C and reduced to magnetite in the presence of organic cpds. decomposing in the presence of Fe oxide, then oxidised to gamma-Fe2O3 with gas contg. O2; then (d) modified by pptn. of Fe(OH)2 and/or Co(OH)2 in alkaline suspension, filtration, drying and tempering under inert gas at 100-350 deg.C.

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.