NL163659C - Werkwijze ter bereiding van ferromagnetisch chroom- dioxyde. - Google Patents

Werkwijze ter bereiding van ferromagnetisch chroom- dioxyde.

Info

Publication number
NL163659C
NL163659C NL6902146.A NL6902146A NL163659C NL 163659 C NL163659 C NL 163659C NL 6902146 A NL6902146 A NL 6902146A NL 163659 C NL163659 C NL 163659C
Authority
NL
Netherlands
Prior art keywords
preparing ferromagnetic
chrome dioxide
dioxide
ferromagnetic chrome
preparing
Prior art date
Application number
NL6902146.A
Other languages
English (en)
Dutch (nl)
Other versions
NL163659B (nl
NL6902146A (fr
Original Assignee
Du Pont
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 Du Pont filed Critical Du Pont
Publication of NL6902146A publication Critical patent/NL6902146A/xx
Publication of NL163659B publication Critical patent/NL163659B/xx
Application granted granted Critical
Publication of NL163659C publication Critical patent/NL163659C/xx

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
    • C01P2004/00—Particle morphology
    • C01P2004/51—Particles with a specific particle size distribution
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
    • C01P2004/00—Particle morphology
    • C01P2004/60—Particles characterised by their size
    • C01P2004/62—Submicrometer sized, i.e. from 0.1-1 micrometer
    • 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)
  • Soft Magnetic Materials (AREA)
  • Compounds Of Iron (AREA)
  • Magnetic Record Carriers (AREA)
NL6902146.A 1968-02-13 1969-02-11 Werkwijze ter bereiding van ferromagnetisch chroom- dioxyde. NL163659C (nl)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US70502968A 1968-02-13 1968-02-13

Publications (3)

Publication Number Publication Date
NL6902146A NL6902146A (fr) 1969-08-15
NL163659B NL163659B (nl) 1980-04-15
NL163659C true NL163659C (nl) 1980-09-15

Family

ID=24831768

Family Applications (1)

Application Number Title Priority Date Filing Date
NL6902146.A NL163659C (nl) 1968-02-13 1969-02-11 Werkwijze ter bereiding van ferromagnetisch chroom- dioxyde.

Country Status (9)

Country Link
US (1) US3529930A (fr)
BE (1) BE728310A (fr)
CA (1) CA924614A (fr)
DE (1) DE1905584C3 (fr)
FR (1) FR2001806B1 (fr)
GB (1) GB1200856A (fr)
LU (1) LU57982A1 (fr)
MY (1) MY7300326A (fr)
NL (1) NL163659C (fr)

Families Citing this family (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4843436B1 (fr) * 1970-10-20 1973-12-18
SE389220B (sv) * 1972-06-30 1976-10-25 Montedison Spa Sett for framstellning av ferromagnetisk krondioxid med fin och homogen granulometri vilket sett medfor utvalda magnetiska egenskaper
IT1012202B (it) * 1974-05-09 1977-03-10 Montedison Spa Procedimento per la produzione di biossido di cromo ferromagnetico
GB1516774A (en) * 1975-10-10 1978-07-05 Anvar Process for preparing chromium dioxide
GB1550852A (en) * 1975-12-08 1979-08-22 Ibm Process for treating chromium dioxice
IT1209139B (it) * 1979-11-16 1989-07-10 Montedison Spa Procedimento per stabilizzare il biossido di cromo ferromagnetico.
DE3263019D1 (en) * 1981-10-26 1985-05-15 Du Pont Surface modified ferromagnetic chromium dioxide
DE3240337A1 (de) * 1982-10-30 1984-05-03 Basf Ag, 6700 Ludwigshafen Nadelfoermige ferromagnetische chromdioxidteilchen
US4495246A (en) * 1983-10-27 1985-01-22 Basf Aktiengesellschaft Acicular ferromagnetic chromium dioxide particles
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
DE3819575A1 (de) * 1988-06-09 1989-12-14 Kloeckner Moeller Elektrizit Stromschiene fuer schienenverteiler, schaltanlagen und dergleichen
DE3837646A1 (de) * 1988-11-05 1990-05-10 Basf Ag Nadelfoermiges, im wesentlichen aus chromdioxid bestehendes, ferromagnetisches material

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2714054A (en) * 1952-02-15 1955-07-26 Houdry Process Corp Method of treating chromic oxide
US2885365A (en) * 1956-10-22 1959-05-05 Du Pont Ruthenium-modified chromium oxide ferromagnetic compositions, their pre-aration and use
FR1407333A (fr) * 1963-07-24 1965-07-30 Bayer Ag Bioxyde de chrome ferromagnétique modifié
US3278263A (en) * 1964-11-27 1966-10-11 Du Pont Ferromagnetic chromium dioxide and preparation thereof

Also Published As

Publication number Publication date
GB1200856A (en) 1970-08-05
LU57982A1 (fr) 1970-09-08
NL163659B (nl) 1980-04-15
DE1905584C3 (de) 1971-06-24
CA924614A (en) 1973-04-17
FR2001806A1 (fr) 1969-10-03
US3529930A (en) 1970-09-22
MY7300326A (en) 1973-12-31
BE728310A (fr) 1969-08-12
NL6902146A (fr) 1969-08-15
FR2001806B1 (fr) 1973-12-21
DE1905584B2 (fr) 1970-10-29
DE1905584A1 (de) 1970-02-05

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Legal Events

Date Code Title Description
V4 Discontinued because of reaching the maximum lifetime of a patent