GB1450241A - Methods of making magnetic metal particles coated with a protective layer - Google Patents

Methods of making magnetic metal particles coated with a protective layer

Info

Publication number
GB1450241A
GB1450241A GB234474A GB234474A GB1450241A GB 1450241 A GB1450241 A GB 1450241A GB 234474 A GB234474 A GB 234474A GB 234474 A GB234474 A GB 234474A GB 1450241 A GB1450241 A GB 1450241A
Authority
GB
United Kingdom
Prior art keywords
alloy
coated
particles
fatty acid
protective layer
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.)
Expired
Application number
GB234474A
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 GB1450241A publication Critical patent/GB1450241A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F1/00—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties
    • H01F1/01—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials
    • H01F1/03—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity
    • H01F1/032—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of hard-magnetic materials
    • H01F1/04—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of hard-magnetic materials metals or alloys
    • H01F1/06—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of hard-magnetic materials metals or alloys in the form of particles, e.g. powder
    • H01F1/061—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of hard-magnetic materials metals or alloys in the form of particles, e.g. powder with a protective layer

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Paints Or Removers (AREA)
  • Hard Magnetic Materials (AREA)
  • Powder Metallurgy (AREA)
  • Magnetic Record Carriers (AREA)
  • Chemical Treatment Of Metals (AREA)

Abstract

1450241 Coated magnetic particles SONY CORP 17 Jan 1974 [24 Jan 1973] 2344/74 Heading B2E A circular magnetic metal particles, e.g. Co, Co-Ni alloy, Fe-Co alloy, Fe-Ni alloy or Fe- Ni-Co alloy, are coated with a protective layer by mixing powdered metal and I to 6% of an alkali metal or ammonium salt of a C 6 to C 26 fatty acid in an inert organic solvent, e.g. toluene, benzene, xylene or cyclohexane, and mechanically mixing to form a chemical bond between the particles and the fatty acid salt. Suitable fatty acid salts include sodium stearate, oleate, linoleate, linolenate and ricisoleate. The fatty acids may have a double bond in their carbon chain and may include a substituent, e.g. OH. The coated particles may be mixed with a binder, e.g. a mixture of vinyl chloride, vinyl and a solvent and coated on a base, e.g. acetate copolymer and polyurethane rubber polyester to form a magnetic recording medium.
GB234474A 1973-01-24 1974-01-17 Methods of making magnetic metal particles coated with a protective layer Expired GB1450241A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP1016573A JPS547074B2 (en) 1973-01-24 1973-01-24

Publications (1)

Publication Number Publication Date
GB1450241A true GB1450241A (en) 1976-09-22

Family

ID=11742658

Family Applications (1)

Application Number Title Priority Date Filing Date
GB234474A Expired GB1450241A (en) 1973-01-24 1974-01-17 Methods of making magnetic metal particles coated with a protective layer

Country Status (7)

Country Link
JP (1) JPS547074B2 (en)
CA (1) CA1017205A (en)
DE (1) DE2403366C2 (en)
FR (1) FR2214948B1 (en)
GB (1) GB1450241A (en)
IT (1) IT1009585B (en)
NL (1) NL181061C (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0027255A1 (en) * 1979-10-09 1981-04-22 Hitachi Maxell Ltd. Magnetic recording medium
US5447682A (en) * 1992-07-06 1995-09-05 Minnesota Mining And Manufacturing Company Method for production of magnetic coating material

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS554804B2 (en) * 1975-03-22 1980-02-01
JPS609322B2 (en) * 1976-07-13 1985-03-09 日立マクセル株式会社 Manufacturing method of metal magnetic powder for magnetic recording
JPS5629841A (en) * 1979-08-12 1981-03-25 Tdk Corp Magnetic recording medium
JPS579802A (en) * 1980-06-20 1982-01-19 Dainippon Ink & Chem Inc Metallic magnetic powder and its manufacture
JPS6036603A (en) * 1983-08-10 1985-02-25 Dainippon Ink & Chem Inc Fine magnetic metallic powder having small specific surface area and its manufacture
JPH0643601B2 (en) * 1985-06-12 1994-06-08 戸田工業株式会社 Method for producing metallic iron particle powder or alloy magnetic particle powder mainly composed of iron

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DD91017A (en) *
FR1114250A (en) * 1953-12-02 1956-04-10 Electro Chimie Soc D Improvements in the manufacture of permanent magnets

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0027255A1 (en) * 1979-10-09 1981-04-22 Hitachi Maxell Ltd. Magnetic recording medium
US5447682A (en) * 1992-07-06 1995-09-05 Minnesota Mining And Manufacturing Company Method for production of magnetic coating material

Also Published As

Publication number Publication date
FR2214948B1 (en) 1978-03-24
IT1009585B (en) 1976-12-20
DE2403366A1 (en) 1974-07-25
CA1017205A (en) 1977-09-13
NL181061C (en) 1987-06-01
NL181061B (en) 1987-01-02
DE2403366C2 (en) 1986-09-04
JPS547074B2 (en) 1979-04-03
JPS4997738A (en) 1974-09-17
FR2214948A1 (en) 1974-08-19
NL7401010A (en) 1974-07-26

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Legal Events

Date Code Title Description
PS Patent sealed
PE20 Patent expired after termination of 20 years

Effective date: 19940116