FR2397049A1 - PROCESS FOR MANUFACTURING MAGNETIC POWDERS AND POWDERS AND SUPPORTS EQUIPPED WITH SUCH POWDERS THUS OBTAINED - Google Patents

PROCESS FOR MANUFACTURING MAGNETIC POWDERS AND POWDERS AND SUPPORTS EQUIPPED WITH SUCH POWDERS THUS OBTAINED

Info

Publication number
FR2397049A1
FR2397049A1 FR7819812A FR7819812A FR2397049A1 FR 2397049 A1 FR2397049 A1 FR 2397049A1 FR 7819812 A FR7819812 A FR 7819812A FR 7819812 A FR7819812 A FR 7819812A FR 2397049 A1 FR2397049 A1 FR 2397049A1
Authority
FR
France
Prior art keywords
powders
manufacturing magnetic
supports equipped
iron oxide
oxide particles
Prior art date
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
FR7819812A
Other languages
French (fr)
Other versions
FR2397049B1 (en
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.)
Sony Corp
Original Assignee
Sony Corp
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 Sony Corp filed Critical Sony Corp
Publication of FR2397049A1 publication Critical patent/FR2397049A1/en
Application granted granted Critical
Publication of FR2397049B1 publication Critical patent/FR2397049B1/fr
Granted 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
    • G11B5/712—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 surface treatment or coating of magnetic particles
    • 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

Landscapes

  • Hard Magnetic Materials (AREA)
  • Compounds Of Iron (AREA)
  • Magnetic Record Carriers (AREA)
  • Paints Or Removers (AREA)

Abstract

a. Procédé de fabrication d'une poudre magnétique. b. Procédé caractérisé en ce qu'on mélange des particules d'oxyde de fer dans une solution aqueuse contenant un sel de cobalt, on ajoute un alcali au mélange pour donner une dispersion ayant une concentration d'alcali d'au moins 3 moles par litre, mais ne dépassant pas 12 moles par litre, et on chauffe la suspension pour déposer un composé de cobalt à la surface des particules d'oxyde de fer.at. A method of manufacturing a magnetic powder. b. A method characterized in that mixing iron oxide particles in an aqueous solution containing a cobalt salt, adding an alkali to the mixture to give a dispersion having an alkali concentration of at least 3 moles per liter, but not exceeding 12 moles per liter, and the suspension is heated to deposit a cobalt compound on the surface of the iron oxide particles.

FR7819812A 1977-07-04 1978-07-03 PROCESS FOR MANUFACTURING MAGNETIC POWDERS AND POWDERS AND SUPPORTS EQUIPPED WITH SUCH POWDERS THUS OBTAINED Granted FR2397049A1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP7964577A JPS5413997A (en) 1977-07-04 1977-07-04 Magnetic recording medium and its manufacture

Publications (2)

Publication Number Publication Date
FR2397049A1 true FR2397049A1 (en) 1979-02-02
FR2397049B1 FR2397049B1 (en) 1982-04-02

Family

ID=13695840

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7819812A Granted FR2397049A1 (en) 1977-07-04 1978-07-03 PROCESS FOR MANUFACTURING MAGNETIC POWDERS AND POWDERS AND SUPPORTS EQUIPPED WITH SUCH POWDERS THUS OBTAINED

Country Status (5)

Country Link
JP (1) JPS5413997A (en)
DE (1) DE2829344A1 (en)
FR (1) FR2397049A1 (en)
GB (1) GB2001942B (en)
NL (1) NL7807250A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0014902A1 (en) * 1979-02-13 1980-09-03 BASF Aktiengesellschaft Method of preparing acicular magnetic cobalt containing iron oxide
EP0014903A1 (en) * 1979-02-13 1980-09-03 BASF Aktiengesellschaft Method for the preparation of acicular magnetic cobalt containing iron oxide

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2903593C3 (en) * 1979-01-31 1982-05-06 Bayer Ag, 5090 Leverkusen Cobalt-doped ferrimagnetic iron oxides and processes for their production
EP0099259A1 (en) * 1982-07-09 1984-01-25 Konica Corporation Process for producing surface-treated ferromagnetic particles
DE3631194A1 (en) * 1986-09-13 1988-03-24 Bayer Ag MAGNETIC IRON OXIDE PIGMENTS AND METHOD FOR THE PRODUCTION THEREOF
DE3631193A1 (en) * 1986-09-13 1988-03-24 Bayer Ag MAGNETIC IRON OXIDE PIGMENTS AND METHOD FOR THE PRODUCTION THEREOF
CN103694746B (en) * 2013-12-27 2015-11-18 广东维诺珠光颜料有限公司 A kind of preparation method of multifunctional magnetic synthetic mica pearlescent pigment

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1318579A (en) * 1969-07-26 1973-05-31 Sony Corp Methods of making acicular cobalt-modified ypsilon-fe2o3 powder
FR2380225A1 (en) * 1977-02-12 1978-09-08 Basf Ag PROCESS FOR PREPARING MAGNETIC IRON OXIDE IN THE FORM OF NEEDLES, CONTAINING COBALT

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5321119B2 (en) * 1973-03-20 1978-06-30
DE2243231C2 (en) * 1972-09-01 1982-01-28 Basf Ag, 6700 Ludwigshafen Process for the preparation of cobalt-doped γ-iron (III) oxide
DE2639250C2 (en) * 1976-09-01 1985-12-12 Basf Ag, 6700 Ludwigshafen Process for the production of acicular, cobalt-doped magnetic iron oxide

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1318579A (en) * 1969-07-26 1973-05-31 Sony Corp Methods of making acicular cobalt-modified ypsilon-fe2o3 powder
FR2380225A1 (en) * 1977-02-12 1978-09-08 Basf Ag PROCESS FOR PREPARING MAGNETIC IRON OXIDE IN THE FORM OF NEEDLES, CONTAINING COBALT

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
CA1975 *
CA1977 *

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0014902A1 (en) * 1979-02-13 1980-09-03 BASF Aktiengesellschaft Method of preparing acicular magnetic cobalt containing iron oxide
EP0014903A1 (en) * 1979-02-13 1980-09-03 BASF Aktiengesellschaft Method for the preparation of acicular magnetic cobalt containing iron oxide

Also Published As

Publication number Publication date
JPS5413997A (en) 1979-02-01
JPS6114642B2 (en) 1986-04-19
DE2829344A1 (en) 1979-01-25
FR2397049B1 (en) 1982-04-02
NL7807250A (en) 1979-01-08
GB2001942A (en) 1979-02-14
DE2829344C2 (en) 1989-03-02
GB2001942B (en) 1982-02-03

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Legal Events

Date Code Title Description
ST Notification of lapse