JPS5678101A - Manufacture of granular powder of acicular magnetic iron oxide - Google Patents

Manufacture of granular powder of acicular magnetic iron oxide

Info

Publication number
JPS5678101A
JPS5678101A JP15572879A JP15572879A JPS5678101A JP S5678101 A JPS5678101 A JP S5678101A JP 15572879 A JP15572879 A JP 15572879A JP 15572879 A JP15572879 A JP 15572879A JP S5678101 A JPS5678101 A JP S5678101A
Authority
JP
Japan
Prior art keywords
iron oxide
fatty acid
aqueous suspension
higher fatty
acicular
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
JP15572879A
Other languages
Japanese (ja)
Other versions
JPS5951725B2 (en
Inventor
Satoshi Saito
Masaru Isoai
Hiroyuki Kondo
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 JP54155728A priority Critical patent/JPS5951725B2/en
Publication of JPS5678101A publication Critical patent/JPS5678101A/en
Publication of JPS5951725B2 publication Critical patent/JPS5951725B2/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

Landscapes

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

Abstract

PURPOSE:To attempt the elevation of dispersibility in an organic solvent and of compatibility in a paint film of the granular powder of an acicular magnetic iron oxide by a method wherein after the acerular hydrous ferric oxide is made to be dispersed and suspended in water, the mixture of a specified quantity of phenol resin and higher fatty acid is made to be dissolved in the aqueous suspension and the pH of the liquid is regulated. CONSTITUTION:The acicular iron oxide grain or the acicular iron oxide grain containing cobalt is made to be dispersed and suspended in water and the mixture of phenol resin like phenol, cresol, etc., having 0.5-5.0wt% against the iron oxide mentioned above and the higher fatty acid of apliphatic monocarboxylic acid, etc., having the carbon number of 8-24 are made to be dissolved in the aqueous suspension to obtain an aqueous suspension having pH of 8 or more [provided that it is made to be, (phenol resin):(higher fatty acid)=(90:5)-(5-95)]. Then after the pH of this liquid is regulated and the surface of the grains are covered with the deposit of the resin and the fatty acid, it is heated and reduced in a reducing gas at the temperature within the range of 300-550 deg.C. By this way, the dispersibility in the solvent and the compatibility in the paint film can be elevated.
JP54155728A 1979-11-30 1979-11-30 Method for producing acicular magnetic iron oxide particle powder Expired JPS5951725B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP54155728A JPS5951725B2 (en) 1979-11-30 1979-11-30 Method for producing acicular magnetic iron oxide particle powder

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP54155728A JPS5951725B2 (en) 1979-11-30 1979-11-30 Method for producing acicular magnetic iron oxide particle powder

Publications (2)

Publication Number Publication Date
JPS5678101A true JPS5678101A (en) 1981-06-26
JPS5951725B2 JPS5951725B2 (en) 1984-12-15

Family

ID=15612159

Family Applications (1)

Application Number Title Priority Date Filing Date
JP54155728A Expired JPS5951725B2 (en) 1979-11-30 1979-11-30 Method for producing acicular magnetic iron oxide particle powder

Country Status (1)

Country Link
JP (1) JPS5951725B2 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6235984U (en) * 1985-08-23 1987-03-03

Also Published As

Publication number Publication date
JPS5951725B2 (en) 1984-12-15

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