JPS57177506A - Manufacture of magnetic powder for magnetic recording medium - Google Patents

Manufacture of magnetic powder for magnetic recording medium

Info

Publication number
JPS57177506A
JPS57177506A JP56061396A JP6139681A JPS57177506A JP S57177506 A JPS57177506 A JP S57177506A JP 56061396 A JP56061396 A JP 56061396A JP 6139681 A JP6139681 A JP 6139681A JP S57177506 A JPS57177506 A JP S57177506A
Authority
JP
Japan
Prior art keywords
magnetic powder
glass
acid
composite
magnetic
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.)
Pending
Application number
JP56061396A
Other languages
Japanese (ja)
Inventor
Akio Ishizawa
Toshihiko Oguchi
Mitsuo Yaegashi
Tadashi Ido
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.)
Toshiba Corp
Original Assignee
Toshiba Corp
Tokyo Shibaura Electric Co Ltd
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 Toshiba Corp, Tokyo Shibaura Electric Co Ltd filed Critical Toshiba Corp
Priority to JP56061396A priority Critical patent/JPS57177506A/en
Publication of JPS57177506A publication Critical patent/JPS57177506A/en
Pending 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

Landscapes

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

Abstract

PURPOSE:To form magnetic powder for magnetic recording medium in corpuscles being independent one by one with each other by a method wherein after a glass material is dissolved in an acid, magnetic powder is made to break away from a glass composite base material, and at the same time, a polymerizing monomer is made to adhere on the surface of magnetic powder to encapsulate. CONSTITUTION:After a composite of glass and a composite of magnetic powder are mixed and melted, the melted mixture is cooled rapidly to form a flake type amorphous material, and moreover the amorphous material thereof is heat-treated at about 700-900 deg.C to make hexagonally corpuscular ferrite to be deposited in the glass type material. To take out the corpuscles from the amorphous material thereof, washing is performed with an acid for the proper hours using a dilute acid, acetic acid for example. The flake type material dissolved in the acid under the proper condition like this way is mixed with the polymerizing monomer, the flakes are pulverized in a crusher to make magnetic powder to be broken away from the glass composite material, and at the same time, the polymerizing monomer is made to be adhered on magnetic powder thereof to be encapsulated or grafted, and after then, it is filtered through a filter, and is dried to take out the treated magnetic powder.
JP56061396A 1981-04-24 1981-04-24 Manufacture of magnetic powder for magnetic recording medium Pending JPS57177506A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP56061396A JPS57177506A (en) 1981-04-24 1981-04-24 Manufacture of magnetic powder for magnetic recording medium

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP56061396A JPS57177506A (en) 1981-04-24 1981-04-24 Manufacture of magnetic powder for magnetic recording medium

Publications (1)

Publication Number Publication Date
JPS57177506A true JPS57177506A (en) 1982-11-01

Family

ID=13169945

Family Applications (1)

Application Number Title Priority Date Filing Date
JP56061396A Pending JPS57177506A (en) 1981-04-24 1981-04-24 Manufacture of magnetic powder for magnetic recording medium

Country Status (1)

Country Link
JP (1) JPS57177506A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59151341A (en) * 1983-02-16 1984-08-29 Fuji Photo Film Co Ltd Manufacture of magnetic ferrite powder for magnetic recording
JP2010080608A (en) * 2008-09-25 2010-04-08 Fujifilm Corp Method of manufacturing hexagonal ferrite magnetic powder, magnetic recording medium, and method of manufacturing the same

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59151341A (en) * 1983-02-16 1984-08-29 Fuji Photo Film Co Ltd Manufacture of magnetic ferrite powder for magnetic recording
JPH0430086B2 (en) * 1983-02-16 1992-05-20
JP2010080608A (en) * 2008-09-25 2010-04-08 Fujifilm Corp Method of manufacturing hexagonal ferrite magnetic powder, magnetic recording medium, and method of manufacturing the same

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