FR2197818A1 - - Google Patents

Info

Publication number
FR2197818A1
FR2197818A1 FR7331734A FR7331734A FR2197818A1 FR 2197818 A1 FR2197818 A1 FR 2197818A1 FR 7331734 A FR7331734 A FR 7331734A FR 7331734 A FR7331734 A FR 7331734A FR 2197818 A1 FR2197818 A1 FR 2197818A1
Authority
FR
France
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.)
Granted
Application number
FR7331734A
Other languages
French (fr)
Other versions
FR2197818B3 (nl
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
BASF SE
Original Assignee
BASF SE
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
Application filed by BASF SE filed Critical BASF SE
Publication of FR2197818A1 publication Critical patent/FR2197818A1/fr
Application granted granted Critical
Publication of FR2197818B3 publication Critical patent/FR2197818B3/fr
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
    • G11B5/62—Record carriers characterised by the selection of the material
    • G11B5/68—Record carriers characterised by the selection of the material comprising one or more layers of magnetisable material homogeneously mixed with a bonding agent
    • G11B5/70—Record 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
    • G11B5/706—Record 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
    • G11B5/70626—Record 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
    • G11B5/70642—Record 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
    • G11B5/70652—Record 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
    • G11B5/70668—Record 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
    • G11B5/70673—Record 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
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
    • G11B5/62—Record carriers characterised by the selection of the material
    • G11B5/68—Record carriers characterised by the selection of the material comprising one or more layers of magnetisable material homogeneously mixed with a bonding agent
    • G11B5/70—Record 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
    • G11B5/706—Record 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
    • G11B5/70626—Record 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
    • G11B5/70642—Record 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
    • G11B5/70652—Record 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
    • G11B5/70663—Preparation processes specially adapted therefor, e.g. using stabilising agents
FR7331734A 1972-09-01 1973-09-03 Expired FR2197818B3 (nl)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19722243231 DE2243231C2 (de) 1972-09-01 1972-09-01 Verfahren zur Herstellung von Cobalt-dotiertem γ-Eisen(III)oxid

Publications (2)

Publication Number Publication Date
FR2197818A1 true FR2197818A1 (nl) 1974-03-29
FR2197818B3 FR2197818B3 (nl) 1976-08-06

Family

ID=5855337

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7331734A Expired FR2197818B3 (nl) 1972-09-01 1973-09-03

Country Status (4)

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

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2353619A1 (fr) * 1976-06-04 1977-12-30 Bayer Ag Production de pigments d'oxyde de fer ayant une resistance amelioree vis-a-vis de l'oxydation
EP0004652A2 (de) * 1978-04-12 1979-10-17 Bayer Ag Verfahren zur Herstellung von Eisenoxiden zur magnetischen Signalaufzeichnung
FR2515412A1 (fr) * 1981-10-12 1983-04-29 Ishihara Mining & Chemical Co Procede de production de poudre d'oxyde de fer magnetique contenant du cobalt
FR2519183A1 (fr) * 1981-12-25 1983-07-01 Ishihara Mining & Chemical Co Procede de preparation d'une poudre d'oxyde de fer magnetique contenant du cobalt

Families Citing this family (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5719049B2 (nl) * 1974-06-13 1982-04-20
DE2705967C2 (de) * 1977-02-12 1990-01-04 Basf Ag, 6700 Ludwigshafen Verfahren zur Herstellung von nadelförmigem kobalthaltigem magnetischem Eisenoxid
JPS5413997A (en) * 1977-07-04 1979-02-01 Sony Corp Magnetic recording medium and its manufacture
DE2743298A1 (de) * 1977-09-27 1979-04-05 Basf Ag Ferromagnetische, im wesentlichen aus eisen bestehende metallteilchen und verfahren zu deren herstellung
US4276183A (en) * 1978-10-25 1981-06-30 Pfizer Inc. Cobalt modified magnetic iron oxide
DE2903593C3 (de) * 1979-01-31 1982-05-06 Bayer Ag, 5090 Leverkusen Kobalt-dotierte ferrimagnetische Eisenoxide und Verfahren zu deren Herstellung
DE2905352A1 (de) 1979-02-13 1980-08-21 Basf Ag Verfahren zur herstellung von nadelfoermigem kobalthaltigem magnetischem eisenoxid
DE2905351A1 (de) 1979-02-13 1980-08-21 Basf Ag Verfahren zur herstellung von nadelfoermigem kobalthaltigem, magnetischem eisenoxid
JPS55149137A (en) * 1979-05-11 1980-11-20 Tdk Corp High performance high coercive force powder and its manufacture
JPS5626729A (en) * 1979-08-11 1981-03-14 Tdk Corp Powdered magnetic material for magnetic recording medium
JPS5819733A (ja) * 1981-07-28 1983-02-04 Toshiba Corp 磁気記録媒体及びその製造方法
JPS59107924A (ja) * 1982-12-08 1984-06-22 Ishihara Sangyo Kaisha Ltd コバルト含有磁性酸化鉄粉末の製造方法
DE3413752A1 (de) * 1984-04-12 1985-10-24 Basf Ag, 6700 Ludwigshafen Verfahren zur herstellung isotroper magnetischer, kobalthaltiger eisenoxide
DE3438093A1 (de) * 1984-10-18 1986-04-24 Basf Ag, 6700 Ludwigshafen Ferrimagnetische teilchen und verfahren zu ihrer herstellung
JPS6187302A (ja) * 1985-10-18 1986-05-02 Sony Corp 磁気記録媒体の製法
DE3631193A1 (de) * 1986-09-13 1988-03-24 Bayer Ag Magnetische eisenoxidpigmente und verfahren zu ihrer herstellung
DE3910782C2 (de) * 1988-12-24 2003-08-28 Toda Kogyo Corp Verfahren zur Herstellung von magnetischen Eisenoxiden und so erhaltene Pigmente

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1592214C3 (de) * 1967-11-25 1979-10-18 Agfa-Gevaert Ag, 5090 Leverkusen Verfahren zur Herstellung von magnetischem γ -Fe2 O3 durch Konvertierung von a -FeOOH-Teilchen
GB1268458A (en) * 1969-05-07 1972-03-29 Ampex Improvements in and relating to the preparation of cobalt doped gamma ferric oxide

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2353619A1 (fr) * 1976-06-04 1977-12-30 Bayer Ag Production de pigments d'oxyde de fer ayant une resistance amelioree vis-a-vis de l'oxydation
EP0004652A2 (de) * 1978-04-12 1979-10-17 Bayer Ag Verfahren zur Herstellung von Eisenoxiden zur magnetischen Signalaufzeichnung
EP0004652A3 (en) * 1978-04-12 1979-10-31 Bayer Aktiengesellschaft Iron oxide for magnetic signal registration and method for its preparation
FR2515412A1 (fr) * 1981-10-12 1983-04-29 Ishihara Mining & Chemical Co Procede de production de poudre d'oxyde de fer magnetique contenant du cobalt
FR2519183A1 (fr) * 1981-12-25 1983-07-01 Ishihara Mining & Chemical Co Procede de preparation d'une poudre d'oxyde de fer magnetique contenant du cobalt

Also Published As

Publication number Publication date
JPS4969588A (nl) 1974-07-05
JPS5737532B2 (nl) 1982-08-10
DE2243231A1 (de) 1974-03-21
FR2197818B3 (nl) 1976-08-06
DE2243231C2 (de) 1982-01-28
GB1432643A (en) 1976-04-22

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