JPS5737532B2 - - Google Patents

Info

Publication number
JPS5737532B2
JPS5737532B2 JP9678673A JP9678673A JPS5737532B2 JP S5737532 B2 JPS5737532 B2 JP S5737532B2 JP 9678673 A JP9678673 A JP 9678673A JP 9678673 A JP9678673 A JP 9678673A JP S5737532 B2 JPS5737532 B2 JP S5737532B2
Authority
JP
Japan
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
JP9678673A
Other languages
Japanese (ja)
Other versions
JPS4969588A (en
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority to DE19722243231 priority Critical patent/DE2243231C2/de
Application filed filed Critical
Publication of JPS4969588A publication Critical patent/JPS4969588A/ja
Publication of JPS5737532B2 publication Critical patent/JPS5737532B2/ja
Expired legal-status Critical Current

Links

Classifications

    • GPHYSICS
    • G11INFORMATION STORAGE
    • G11BINFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B5/00Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
    • G11B5/62Record carriers characterised by the selection of the material
    • G11B5/68Record carriers characterised by the selection of the material comprising one or more layers of magnetisable material homogeneously mixed with a bonding agent
    • G11B5/70Record carriers characterised by the selection of the material comprising one or more layers of magnetisable material homogeneously mixed with a bonding agent on a base layer
    • G11B5/706Record carriers characterised by the selection of the material comprising one or more layers of magnetisable material homogeneously mixed with a bonding agent on a base layer characterised by the composition of the magnetic material
    • G11B5/70626Record carriers characterised by the selection of the material comprising one or more layers of magnetisable material homogeneously mixed with a bonding agent on a base layer characterised by the composition of the magnetic material containing non-metallic substances
    • G11B5/70642Record carriers characterised by the selection of the material comprising one or more layers of magnetisable material homogeneously mixed with a bonding agent on a base layer characterised by the composition of the magnetic material containing non-metallic substances iron oxides
    • G11B5/70652Record carriers characterised by the selection of the material comprising one or more layers of magnetisable material homogeneously mixed with a bonding agent on a base layer characterised by the composition of the magnetic material containing non-metallic substances iron oxides gamma - Fe2 O3
    • G11B5/70668Record carriers characterised by the selection of the material comprising one or more layers of magnetisable material homogeneously mixed with a bonding agent on a base layer characterised by the composition of the magnetic material containing non-metallic substances iron oxides gamma - Fe2 O3 containing a dopant
    • G11B5/70673Record carriers characterised by the selection of the material comprising one or more layers of magnetisable material homogeneously mixed with a bonding agent on a base layer characterised by the composition of the magnetic material containing non-metallic substances iron oxides gamma - Fe2 O3 containing a dopant containing Co
    • GPHYSICS
    • G11INFORMATION STORAGE
    • G11BINFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B5/00Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
    • G11B5/62Record carriers characterised by the selection of the material
    • G11B5/68Record carriers characterised by the selection of the material comprising one or more layers of magnetisable material homogeneously mixed with a bonding agent
    • G11B5/70Record carriers characterised by the selection of the material comprising one or more layers of magnetisable material homogeneously mixed with a bonding agent on a base layer
    • G11B5/706Record carriers characterised by the selection of the material comprising one or more layers of magnetisable material homogeneously mixed with a bonding agent on a base layer characterised by the composition of the magnetic material
    • G11B5/70626Record carriers characterised by the selection of the material comprising one or more layers of magnetisable material homogeneously mixed with a bonding agent on a base layer characterised by the composition of the magnetic material containing non-metallic substances
    • G11B5/70642Record carriers characterised by the selection of the material comprising one or more layers of magnetisable material homogeneously mixed with a bonding agent on a base layer characterised by the composition of the magnetic material containing non-metallic substances iron oxides
    • G11B5/70652Record carriers characterised by the selection of the material comprising one or more layers of magnetisable material homogeneously mixed with a bonding agent on a base layer characterised by the composition of the magnetic material containing non-metallic substances iron oxides gamma - Fe2 O3
    • G11B5/70663Preparation processes specially adapted therefor, e.g. using stabilising agents
JP9678673A 1972-09-01 1973-08-30 Expired JPS5737532B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE19722243231 DE2243231C2 (en) 1972-09-01 1972-09-01

Publications (2)

Publication Number Publication Date
JPS4969588A JPS4969588A (en) 1974-07-05
JPS5737532B2 true JPS5737532B2 (en) 1982-08-10

Family

ID=5855337

Family Applications (1)

Application Number Title Priority Date Filing Date
JP9678673A Expired JPS5737532B2 (en) 1972-09-01 1973-08-30

Country Status (4)

Country Link
JP (1) JPS5737532B2 (en)
DE (1) DE2243231C2 (en)
FR (1) FR2197818B3 (en)
GB (1) GB1432643A (en)

Families Citing this family (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5719049B2 (en) * 1974-06-13 1982-04-20
DE2625106C2 (en) * 1976-06-04 1982-03-11 Bayer Ag, 5090 Leverkusen, De
DE2705967C2 (en) * 1977-02-12 1990-01-04 Basf Ag, 6700 Ludwigshafen, De
JPS6114642B2 (en) * 1977-07-04 1986-04-19 Sony Corp
DE2743298C2 (en) * 1977-09-27 1989-10-12 Basf Ag, 6700 Ludwigshafen, De
DE2815712A1 (en) * 1978-04-12 1979-10-25 Bayer Ag IRON OXIDES FOR MAGNETIC SIGNAL RECORDING AND PROCESS FOR THEIR PRODUCTION
US4276183A (en) * 1978-10-25 1981-06-30 Pfizer Inc. Cobalt modified magnetic iron oxide
DE2903593C3 (en) * 1979-01-31 1982-05-06 Bayer Ag, 5090 Leverkusen, De
JPS6348810B2 (en) * 1979-05-11 1988-09-30 Tdk Electronics Co Ltd
JPS5626729A (en) * 1979-08-11 1981-03-14 Tdk Corp Powdered magnetic material for magnetic recording medium
JPS6250889B2 (en) * 1981-07-28 1987-10-27 Tokyo Shibaura Electric Co
US4501774A (en) * 1981-10-12 1985-02-26 Ishihara Sangyo Kaisha, Ltd. Process for the production of cobalt-containing magnetic iron oxide powder
AU555302B2 (en) * 1981-12-25 1986-09-18 Ishihara Sangyo Kaisha Ltd. Cobalt containing iron oxide powder
JPS6323137B2 (en) * 1982-12-08 1988-05-14 Ishihara Sangyo Kaisha
DE3413752A1 (en) * 1984-04-12 1985-10-24 Basf Ag METHOD FOR PRODUCING ISOTROPIC MAGNETIC, COBAL-CONTAINING IRON OXIDS
DE3438093A1 (en) * 1984-10-18 1986-04-24 Basf Ag FERRIMAGNETIC PARTICLES AND METHOD FOR THEIR PRODUCTION
JPS6187302A (en) * 1985-10-18 1986-05-02 Sony Corp Manufacture of magnetic recording medium
DE3631193A1 (en) * 1986-09-13 1988-03-24 Bayer Ag MAGNETIC IRON OXIDE PIGMENTS AND METHOD FOR THE PRODUCTION THEREOF
DE3910782C2 (en) * 1988-12-24 2003-08-28 Toda Kogyo Corp Process for the production of magnetic iron oxides and pigments thus obtained

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1592214C3 (en) * 1967-11-25 1979-10-18 Agfa-Gevaert Ag, 5090 Leverkusen
DE1803783B2 (en) * 1968-10-18 1977-03-31 Process for production of finely divided acicular gamma-fe-deep 2-0tief 3
GB1268458A (en) * 1969-05-07 1972-03-29 Ampex Improvements in and relating to the preparation of cobalt doped gamma ferric oxide

Also Published As

Publication number Publication date
JPS4969588A (en) 1974-07-05
FR2197818B3 (en) 1976-08-06
GB1432643A (en) 1976-04-22
FR2197818A1 (en) 1974-03-29
DE2243231C2 (en) 1982-01-28
DE2243231A1 (en) 1974-03-21

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