JPS57198607A - Manufacture of magnetic iron oxide particle powder for magnetic recording material - Google Patents

Manufacture of magnetic iron oxide particle powder for magnetic recording material

Info

Publication number
JPS57198607A
JPS57198607A JP56083344A JP8334481A JPS57198607A JP S57198607 A JPS57198607 A JP S57198607A JP 56083344 A JP56083344 A JP 56083344A JP 8334481 A JP8334481 A JP 8334481A JP S57198607 A JPS57198607 A JP S57198607A
Authority
JP
Japan
Prior art keywords
recording material
iron oxide
magnetic
solution
magnetic recording
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
JP56083344A
Other languages
Japanese (ja)
Other versions
JPS6051243B2 (en
Inventor
Hiroyuki Kondo
Nariyasu Jikuhara
Atsushi Takedoi
Masaru Isoai
Kazuyuki Takama
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.)
Toda Kogyo Corp
Original Assignee
Toda Kogyo 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 Toda Kogyo Corp filed Critical Toda Kogyo Corp
Priority to JP56083344A priority Critical patent/JPS6051243B2/en
Publication of JPS57198607A publication Critical patent/JPS57198607A/en
Publication of JPS6051243B2 publication Critical patent/JPS6051243B2/en
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
    • G11B5/70678—Ferrites

Landscapes

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

Abstract

PURPOSE:To obtain excellent transfer characteristic in a magnetic recording material, by employing Ba or Sr with Co to modify magnetized iron particles under specific conditions, thereby providing a recording material having high coercive force. CONSTITUTION:An aqueous Co salt solution and Ba or Sr salt are added to a liquid dispersion of magentic iron oxide particles (FeOx.Fe2O3, where 0<=x<=1). Then, an alkali is added to this solution so that OH group concentration in the solution becomes 0.05-3.0mol/l. Then, this solution is stirred at 50-100 deg.C in a non-acidic atmosphere, thereby modifying magnetic iron oxide particles with Co and Ba or Sr. Subsequently, the particles are filtered and dried. According to this method, magnetic iron oxide particle powder having high coercive force and high saturation magnetization, and excellent transfer characteristic as a magnetic recording material can be obtained.
JP56083344A 1981-05-30 1981-05-30 Method for producing magnetic iron oxide particles for magnetic recording materials Expired JPS6051243B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP56083344A JPS6051243B2 (en) 1981-05-30 1981-05-30 Method for producing magnetic iron oxide particles for magnetic recording materials

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP56083344A JPS6051243B2 (en) 1981-05-30 1981-05-30 Method for producing magnetic iron oxide particles for magnetic recording materials

Publications (2)

Publication Number Publication Date
JPS57198607A true JPS57198607A (en) 1982-12-06
JPS6051243B2 JPS6051243B2 (en) 1985-11-13

Family

ID=13799814

Family Applications (1)

Application Number Title Priority Date Filing Date
JP56083344A Expired JPS6051243B2 (en) 1981-05-30 1981-05-30 Method for producing magnetic iron oxide particles for magnetic recording materials

Country Status (1)

Country Link
JP (1) JPS6051243B2 (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5819733A (en) * 1981-07-28 1983-02-04 Toshiba Corp Magnetic recording medium and its manufacture
US4539129A (en) * 1982-08-31 1985-09-03 Toda Kogyo Corp. Barium ferrite particles and process for producing said particles
US4851258A (en) * 1987-01-21 1989-07-25 Showa Denko Kabushiki Kaisha Method for preparing magnetic particles for magnetic-recording media
US5294492A (en) * 1990-10-31 1994-03-15 Toda Kogyo Corp. Acicular magnetic iron oxide particles

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63167842A (en) * 1986-12-29 1988-07-11 明興金属工業株式会社 Scaffold apparatus for building
JPH04285262A (en) * 1991-03-15 1992-10-09 Tachibana Shusuke Expandable unit, expandable scaffold, and method of assembling and disassembling scaffold

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5819733A (en) * 1981-07-28 1983-02-04 Toshiba Corp Magnetic recording medium and its manufacture
JPS6250889B2 (en) * 1981-07-28 1987-10-27 Tokyo Shibaura Electric Co
US4539129A (en) * 1982-08-31 1985-09-03 Toda Kogyo Corp. Barium ferrite particles and process for producing said particles
US4851258A (en) * 1987-01-21 1989-07-25 Showa Denko Kabushiki Kaisha Method for preparing magnetic particles for magnetic-recording media
US5294492A (en) * 1990-10-31 1994-03-15 Toda Kogyo Corp. Acicular magnetic iron oxide particles

Also Published As

Publication number Publication date
JPS6051243B2 (en) 1985-11-13

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