CA960835A - Process for treating ferromagnetic chromium dioxide - Google Patents

Process for treating ferromagnetic chromium dioxide

Info

Publication number
CA960835A
CA960835A CA125,440A CA125440A CA960835A CA 960835 A CA960835 A CA 960835A CA 125440 A CA125440 A CA 125440A CA 960835 A CA960835 A CA 960835A
Authority
CA
Canada
Prior art keywords
chromium dioxide
ferromagnetic chromium
treating
treating ferromagnetic
dioxide
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
CA125,440A
Other languages
English (en)
Other versions
CA125440S (en
Inventor
Tatsuji Kitamoto
Goro Akashi
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.)
Fujifilm Holdings Corp
Original Assignee
Fuji Photo Film Co 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 Fuji Photo Film Co Ltd filed Critical Fuji Photo Film Co Ltd
Application granted granted Critical
Publication of CA960835A publication Critical patent/CA960835A/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
    • G11B5/70636—CrO2
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01G—COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSES C01D OR C01F
    • C01G37/00—Compounds of chromium
    • C01G37/02—Oxides or hydrates thereof
    • 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
    • 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
    • C01P2006/80—Compositional purity

Landscapes

  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Inorganic Chemistry (AREA)
  • Hard Magnetic Materials (AREA)
  • Thin Magnetic Films (AREA)
  • Magnetic Record Carriers (AREA)
  • Inorganic Compounds Of Heavy Metals (AREA)
CA125,440A 1970-10-20 1971-10-18 Process for treating ferromagnetic chromium dioxide Expired CA960835A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP45091823A JPS4843436B1 (ja) 1970-10-20 1970-10-20

Publications (1)

Publication Number Publication Date
CA960835A true CA960835A (en) 1975-01-14

Family

ID=14037325

Family Applications (1)

Application Number Title Priority Date Filing Date
CA125,440A Expired CA960835A (en) 1970-10-20 1971-10-18 Process for treating ferromagnetic chromium dioxide

Country Status (4)

Country Link
US (1) US3767580A (ja)
JP (1) JPS4843436B1 (ja)
CA (1) CA960835A (ja)
GB (1) GB1354394A (ja)

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2120206A1 (de) * 1971-04-24 1972-11-02 Badische Anilin- & Soda-Fabrik Ag, 6700 Ludwigshafen Ferromagnetische Chromdioxidkristalle
IT956230B (it) * 1972-04-22 1973-10-10 Montedison Spa Composizione di biossido di cromo ferromagnetico modificato e p oces so di preparazione
JPS5021322U (ja) * 1973-06-16 1975-03-11
JPS5022936U (ja) * 1973-06-25 1975-03-14
GB1550852A (en) * 1975-12-08 1979-08-22 Ibm Process for treating chromium dioxice
DE3718299A1 (de) * 1987-05-30 1988-12-15 Basf Ag Verfahren zur herstellung von stabilisiertem nadelfoermigem ferromagnetischem chromdioxid
DE3828498A1 (de) * 1988-08-23 1990-03-01 Basf Ag Chromdioxidmaterial, verfahren zu dessen herstellung sowie magnetische aufzeichnungstraeger enthaltend dieses chromdioxidmaterial
DE3843442A1 (de) * 1988-12-23 1990-06-28 Basf Ag Magnetische aufzeichnungstraeger
US5217810A (en) * 1988-12-23 1993-06-08 Basf Aktiengesellschaft Magnetic recording medium having a magnetic layer containing chromium dioxide particles and linolenic acid
DE3941578A1 (de) * 1989-12-16 1991-06-20 Basf Ag Verfahren zur herstellung von stabilisiertem chromdioxid und magnetischer aufzeichnungstraeger enthaltend dieses material

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3449073A (en) * 1965-12-14 1969-06-10 Du Pont Process for preparing chromium dioxide and product thereof
US3451771A (en) * 1966-10-27 1969-06-24 Du Pont Preparation of ferromagnetic cro2 by heating cro3 in the presence of o2 and cr2o3
US3529930A (en) * 1968-02-13 1970-09-22 Du Pont Process for improving ferromagnetic properties of chromium dioxide by heating in an oxidizing environment

Also Published As

Publication number Publication date
US3767580A (en) 1973-10-23
GB1354394A (en) 1974-06-05
JPS4843436B1 (ja) 1973-12-18
DE2152331A1 (de) 1972-04-27
DE2152331B2 (de) 1976-09-16

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