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JPS5610903A - Preparation of magnetic powder for magnetic recording - Google Patents

Preparation of magnetic powder for magnetic recording

Info

Publication number
JPS5610903A
JPS5610903A JP8634279A JP8634279A JPS5610903A JP S5610903 A JPS5610903 A JP S5610903A JP 8634279 A JP8634279 A JP 8634279A JP 8634279 A JP8634279 A JP 8634279A JP S5610903 A JPS5610903 A JP S5610903A
Authority
JP
Japan
Prior art keywords
magnetic powder
particles
coated
powder
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.)
Granted
Application number
JP8634279A
Other languages
Japanese (ja)
Other versions
JPS6331086B2 (en
Inventor
Haruo Ando
Fumio Togawa
Toshihiko Tanabe
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.)
Maxell Ltd
Original Assignee
Hitachi Maxell 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 Hitachi Maxell Ltd filed Critical Hitachi Maxell Ltd
Priority to JP8634279A priority Critical patent/JPS5610903A/en
Priority to DE8080102919T priority patent/DE3064620D1/en
Priority to EP80102919A priority patent/EP0019894B1/en
Priority to US06/154,015 priority patent/US4299882A/en
Publication of JPS5610903A publication Critical patent/JPS5610903A/en
Publication of JPS6331086B2 publication Critical patent/JPS6331086B2/ja
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
    • G11B5/7013—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 dispersing agent

Landscapes

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

Abstract

PURPOSE:To obtain the excellent magnetic powder by a method wherein the surfaces of particles are coated with dispersant and the particles are kneaded and a mechanical shearing force is provided to them before drying when nuclear crystals of iron oxide magnetic powder are coated with a cobalt compound and are washed with water and are filtered and dried. CONSTITUTION:A suspension that contains needlelike gamma-Fe2O3 magnetic powder, cobalt sulfate, ferrous sulfate and caustic soda or the like is heated at the boiling point of 100 deg.C for about 6hr, and the nuclear crystals of iron oxide magnetic powder are coated with a cobalt compound. Next it is filtered, polyoxyethylene alkyl acid ester as a dispersant is added to the cake of 35% moisture content by weight and the mixture is kneaded by means of a kneader for about 1hr to provide a mechanical shearing force to the particles. After this, it is heated at temperature of 130 deg.C for about 3hr and is dried to obtain a magnetic powder for the magnetic recording. In this way, a powder with excellent characteristics on dispersion, orientation and packing can be obtained.
JP8634279A 1979-05-28 1979-07-07 Preparation of magnetic powder for magnetic recording Granted JPS5610903A (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
JP8634279A JPS5610903A (en) 1979-07-07 1979-07-07 Preparation of magnetic powder for magnetic recording
DE8080102919T DE3064620D1 (en) 1979-05-28 1980-05-24 Magnetic recording medium and process for its preparation
EP80102919A EP0019894B1 (en) 1979-05-28 1980-05-24 Magnetic recording medium and process for its preparation
US06/154,015 US4299882A (en) 1979-05-28 1980-05-28 Magnetic recording medium and process

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP8634279A JPS5610903A (en) 1979-07-07 1979-07-07 Preparation of magnetic powder for magnetic recording

Publications (2)

Publication Number Publication Date
JPS5610903A true JPS5610903A (en) 1981-02-03
JPS6331086B2 JPS6331086B2 (en) 1988-06-22

Family

ID=13884174

Family Applications (1)

Application Number Title Priority Date Filing Date
JP8634279A Granted JPS5610903A (en) 1979-05-28 1979-07-07 Preparation of magnetic powder for magnetic recording

Country Status (1)

Country Link
JP (1) JPS5610903A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3702161A1 (en) * 1986-01-30 1987-08-06 Ishihara Mining & Chemical Co COBAL-CONTAINING FERROMAGNETIC POWDERED IRON OXIDE AND METHOD FOR THE PRODUCTION THEREOF
JPS63275028A (en) * 1987-05-01 1988-11-11 Mihama Hisaharu Magnetic material particle treated with coating material
JP2011184262A (en) * 2010-03-10 2011-09-22 General Co Ltd Aqueous magnetic dispersion and magnetic inkjet ink

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5446510A (en) * 1977-09-20 1979-04-12 Hitachi Maxell Magnetic recording medium

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5446510A (en) * 1977-09-20 1979-04-12 Hitachi Maxell Magnetic recording medium

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3702161A1 (en) * 1986-01-30 1987-08-06 Ishihara Mining & Chemical Co COBAL-CONTAINING FERROMAGNETIC POWDERED IRON OXIDE AND METHOD FOR THE PRODUCTION THEREOF
DE3702161C2 (en) * 1986-01-30 1998-08-27 Ishihara Sangyo Kaisha Ferromagnetic iron oxide powder containing cobalt and process for its preparation
JPS63275028A (en) * 1987-05-01 1988-11-11 Mihama Hisaharu Magnetic material particle treated with coating material
JP2011184262A (en) * 2010-03-10 2011-09-22 General Co Ltd Aqueous magnetic dispersion and magnetic inkjet ink

Also Published As

Publication number Publication date
JPS6331086B2 (en) 1988-06-22

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