IT1209139B - Procedimento per stabilizzare il biossido di cromo ferromagnetico. - Google Patents

Procedimento per stabilizzare il biossido di cromo ferromagnetico.

Info

Publication number
IT1209139B
IT1209139B IT7927333A IT2733379A IT1209139B IT 1209139 B IT1209139 B IT 1209139B IT 7927333 A IT7927333 A IT 7927333A IT 2733379 A IT2733379 A IT 2733379A IT 1209139 B IT1209139 B IT 1209139B
Authority
IT
Italy
Prior art keywords
procedure
chromium dioxide
ferromagnetic chromium
stabilizing
stabilizing ferromagnetic
Prior art date
Application number
IT7927333A
Other languages
English (en)
Other versions
IT7927333A0 (it
Inventor
Giampiero Basile
Giancarlo Boero
Emiliano Mello Ceresa
Franco Montin
Original Assignee
Montedison Spa
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 Montedison Spa filed Critical Montedison Spa
Priority to IT7927333A priority Critical patent/IT1209139B/it
Publication of IT7927333A0 publication Critical patent/IT7927333A0/it
Priority to EP80304081A priority patent/EP0029687B1/en
Priority to DE8080304081T priority patent/DE3064542D1/de
Priority to JP15965880A priority patent/JPS5684319A/ja
Priority to US06/318,413 priority patent/US4374118A/en
Application granted granted Critical
Publication of IT1209139B publication Critical patent/IT1209139B/it

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
    • C01G37/027—Chromium dioxide
    • 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)
  • Hard Magnetic Materials (AREA)
  • Inorganic Compounds Of Heavy Metals (AREA)
  • Magnetic Record Carriers (AREA)
IT7927333A 1979-11-16 1979-11-16 Procedimento per stabilizzare il biossido di cromo ferromagnetico. IT1209139B (it)

Priority Applications (5)

Application Number Priority Date Filing Date Title
IT7927333A IT1209139B (it) 1979-11-16 1979-11-16 Procedimento per stabilizzare il biossido di cromo ferromagnetico.
EP80304081A EP0029687B1 (en) 1979-11-16 1980-11-13 Process for stabilizing ferromagnetic chromium dioxide
DE8080304081T DE3064542D1 (en) 1979-11-16 1980-11-13 Process for stabilizing ferromagnetic chromium dioxide
JP15965880A JPS5684319A (en) 1979-11-16 1980-11-14 Stabilization of highly magnetic chromium dioxide
US06/318,413 US4374118A (en) 1979-11-16 1981-11-05 Process for stabilizing ferromagnetic chromium dioxide

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
IT7927333A IT1209139B (it) 1979-11-16 1979-11-16 Procedimento per stabilizzare il biossido di cromo ferromagnetico.

Publications (2)

Publication Number Publication Date
IT7927333A0 IT7927333A0 (it) 1979-11-16
IT1209139B true IT1209139B (it) 1989-07-10

Family

ID=11221444

Family Applications (1)

Application Number Title Priority Date Filing Date
IT7927333A IT1209139B (it) 1979-11-16 1979-11-16 Procedimento per stabilizzare il biossido di cromo ferromagnetico.

Country Status (5)

Country Link
US (1) US4374118A (it)
EP (1) EP0029687B1 (it)
JP (1) JPS5684319A (it)
DE (1) DE3064542D1 (it)
IT (1) IT1209139B (it)

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3263019D1 (en) * 1981-10-26 1985-05-15 Du Pont Surface modified ferromagnetic chromium dioxide
DE3535465A1 (de) * 1985-10-04 1987-04-09 Basf Ag Verfahren zur verbesserung von ferromagnetischem chromdioxid
DE3536116A1 (de) * 1985-10-10 1987-04-16 Basf Ag Verfahren zur stabilisierung von nadelfoermigem ferromagnetischem chromdioxid
JPH0743824B2 (ja) * 1986-06-04 1995-05-15 日立マクセル株式会社 磁気記録媒体およびその製造方法
DE3828498A1 (de) * 1988-08-23 1990-03-01 Basf Ag Chromdioxidmaterial, verfahren zu dessen herstellung sowie magnetische aufzeichnungstraeger enthaltend dieses chromdioxidmaterial
DE3837646A1 (de) * 1988-11-05 1990-05-10 Basf Ag Nadelfoermiges, im wesentlichen aus chromdioxid bestehendes, ferromagnetisches material
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
US20090162273A1 (en) * 2007-12-21 2009-06-25 Howmedica Osteonics Corp. Chromium oxide powder having a reduced level of hexavalent chromium and a method of making the powder

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3529930A (en) * 1968-02-13 1970-09-22 Du Pont Process for improving ferromagnetic properties of chromium dioxide by heating in an oxidizing environment
GB1187154A (en) * 1968-03-01 1970-04-08 Du Pont Process for Preparing Ferromagnetic Materials.
US3512930A (en) * 1969-05-07 1970-05-19 Du Pont Stabilized ferromagnetic chromium dioxide
GB1312812A (en) * 1969-06-20 1973-04-11 Nippon Chemical Ind Process for preparing magnetic chromium dioxide
JPS5523770B2 (it) * 1972-05-17 1980-06-25
JPS5047899A (it) * 1973-08-30 1975-04-28
GB1550852A (en) * 1975-12-08 1979-08-22 Ibm Process for treating chromium dioxice

Also Published As

Publication number Publication date
EP0029687B1 (en) 1983-08-10
US4374118A (en) 1983-02-15
JPS5684319A (en) 1981-07-09
DE3064542D1 (en) 1983-09-15
IT7927333A0 (it) 1979-11-16
EP0029687A1 (en) 1981-06-03

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