CA988704A - Ferro-magnetic acicular particles for recording medium - Google Patents

Ferro-magnetic acicular particles for recording medium

Info

Publication number
CA988704A
CA988704A CA147,474A CA147474A CA988704A CA 988704 A CA988704 A CA 988704A CA 147474 A CA147474 A CA 147474A CA 988704 A CA988704 A CA 988704A
Authority
CA
Canada
Prior art keywords
ferro
recording medium
acicular particles
magnetic acicular
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.)
Expired
Application number
CA147,474A
Other languages
English (en)
Other versions
CA147474S (en
Inventor
Akira Okazoe
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 Holdings 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
Priority claimed from JP46083071A external-priority patent/JPS5123039B2/ja
Application filed by Hitachi Maxell Ltd filed Critical Hitachi Maxell Ltd
Application granted granted Critical
Publication of CA988704A publication Critical patent/CA988704A/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
    • G11B5/70652—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 gamma - Fe2 O3
    • G11B5/70657—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 gamma - Fe2 O3 with a skin
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01G—COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSES C01D OR C01F
    • C01G49/00—Compounds of iron
    • C01G49/02—Oxides; Hydroxides
    • C01G49/06—Ferric oxide [Fe2O3]
    • 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
    • G11B5/70647—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 with a skin
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
    • C01P2004/00—Particle morphology
    • C01P2004/10—Particle morphology extending in one dimension, e.g. needle-like
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
    • C01P2006/00—Physical properties of inorganic compounds
    • C01P2006/42—Magnetic properties

Landscapes

  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Inorganic Chemistry (AREA)
  • Health & Medical Sciences (AREA)
  • Dermatology (AREA)
  • General Health & Medical Sciences (AREA)
  • Hard Magnetic Materials (AREA)
  • Compounds Of Iron (AREA)
  • Magnetic Record Carriers (AREA)
CA147,474A 1971-07-19 1972-07-19 Ferro-magnetic acicular particles for recording medium Expired CA988704A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP5378671 1971-07-19
JP46083071A JPS5123039B2 (de) 1971-10-19 1971-10-19

Publications (1)

Publication Number Publication Date
CA988704A true CA988704A (en) 1976-05-11

Family

ID=26394498

Family Applications (1)

Application Number Title Priority Date Filing Date
CA147,474A Expired CA988704A (en) 1971-07-19 1972-07-19 Ferro-magnetic acicular particles for recording medium

Country Status (2)

Country Link
CA (1) CA988704A (de)
DE (1) DE2235383C3 (de)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2705967A1 (de) * 1977-02-12 1978-08-17 Basf Ag Verfahren zur herstellung von nadelfoermigem kobalthaltigem magnetischem eisenoxid
US4923519A (en) * 1986-09-13 1990-05-08 Bayer Aktiengesellschaft Magnetic iron oxide pigments and a process for their preparation
US4933014A (en) * 1986-09-13 1990-06-12 Bayer Aktiengeselschaft Magnetic iron oxide pigments and a process for their preparation

Families Citing this family (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS525497A (en) * 1975-07-02 1977-01-17 Fuji Photo Film Co Ltd Ferromagnetic grit manufacturing process
JPS5853493B2 (ja) * 1975-07-02 1983-11-29 富士写真フイルム株式会社 キヨウジセイフンマツノセイホウ
JPS608606B2 (ja) * 1975-07-02 1985-03-04 富士写真フイルム株式会社 強磁性粉末の製法
JPS5814729B2 (ja) * 1975-08-01 1983-03-22 富士写真フイルム株式会社 キヨウジセイフンマツノセイゾウホウホウ
AT345252B (de) * 1975-10-31 1978-09-11 Unibra Sa Verfahren zur herstellung von magnetoxiden
JPS6044254B2 (ja) * 1977-03-16 1985-10-02 富士写真フイルム株式会社 強磁性粉末の製造方法
AU558199B2 (en) * 1982-09-16 1987-01-22 Ishihara Sangyo Kaisha Ltd. Production of magnetic powder
US4683167A (en) * 1984-06-25 1987-07-28 Ampex Corporation Magnetic iron oxide pigment and recording media
DE3438093A1 (de) * 1984-10-18 1986-04-24 Basf Ag, 6700 Ludwigshafen Ferrimagnetische teilchen und verfahren zu ihrer herstellung
DE3616096A1 (de) * 1986-05-13 1987-11-19 Basf Ag Verfahren zur herstellung kobalthaltiger, nadelfoermiger, magnetischer eisenoxide
DE3910782C2 (de) * 1988-12-24 2003-08-28 Toda Kogyo Corp Verfahren zur Herstellung von magnetischen Eisenoxiden und so erhaltene Pigmente

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1226997B (de) * 1959-06-12 1966-10-20 Bayer Ag Verfahren zur Herstellung von nadelfoermigem, cobalthaltigem gamma-Eisen(III)-oxid
US3116255A (en) * 1961-10-31 1963-12-31 Gen Electric Magnetic bodies containing magnetically coupled ferromagnetic and ferrimagnetic portions
DE1199747B (de) * 1962-03-29 1965-09-02 Basf Ag Verfahren zur Herstellung von in organischen Bindemitteln gut homogenisier- und dispergier-baren und fuer die Herstellung von Magneto-grammtraegern mit hoher Kopierdaempfung geeigneten ferromagnetischen Eisenoxyden
DE1247026B (de) * 1965-01-09 1967-08-10 Basf Ag Verfahren zur Herstellung von fuer die Herstellung von Magnetogrammtraegern geeigneten, magnetisierbaren metallischen Teilchen
US3573980A (en) * 1968-02-19 1971-04-06 Minnesota Mining & Mfg Method of making magnetic particles and recording tape

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2705967A1 (de) * 1977-02-12 1978-08-17 Basf Ag Verfahren zur herstellung von nadelfoermigem kobalthaltigem magnetischem eisenoxid
US4923519A (en) * 1986-09-13 1990-05-08 Bayer Aktiengesellschaft Magnetic iron oxide pigments and a process for their preparation
US4933014A (en) * 1986-09-13 1990-06-12 Bayer Aktiengeselschaft Magnetic iron oxide pigments and a process for their preparation

Also Published As

Publication number Publication date
DE2235383C3 (de) 1986-10-23
DE2235383A1 (de) 1973-02-15
DE2235383B2 (de) 1979-08-23

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