HK56490A - Process for producing ferromagnetic chromium dioxide - Google Patents

Process for producing ferromagnetic chromium dioxide

Info

Publication number
HK56490A
HK56490A HK564/90A HK56490A HK56490A HK 56490 A HK56490 A HK 56490A HK 564/90 A HK564/90 A HK 564/90A HK 56490 A HK56490 A HK 56490A HK 56490 A HK56490 A HK 56490A
Authority
HK
Hong Kong
Prior art keywords
chromium dioxide
ferromagnetic chromium
water
antimony compound
producing ferromagnetic
Prior art date
Application number
HK564/90A
Other languages
English (en)
Inventor
Manfred Dr Ohlinger
Norbert Dr Mueller
Rudolf Dr Peter
Eugen Wettstein
Original Assignee
Basf Ag
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 Basf Ag filed Critical Basf Ag
Publication of HK56490A publication Critical patent/HK56490A/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
    • 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
    • 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
    • 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
    • C01P2004/00—Particle morphology
    • C01P2004/80—Particles consisting of a mixture of two or more inorganic phases
    • C01P2004/82—Particles consisting of a mixture of two or more inorganic phases two phases having the same anion, e.g. both oxidic phases
    • 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
    • C01P2006/11—Powder tap density
    • 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
    • C01P2006/12—Surface area
    • 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)
  • Paints Or Removers (AREA)
  • Inorganic Compounds Of Heavy Metals (AREA)
  • Magnetic Record Carriers (AREA)
  • Compounds Of Iron (AREA)
  • Pharmaceuticals Containing Other Organic And Inorganic Compounds (AREA)
HK564/90A 1985-04-17 1990-07-26 Process for producing ferromagnetic chromium dioxide HK56490A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19853513723 DE3513723A1 (de) 1985-04-17 1985-04-17 Verfahren zur herstellung von ferromagnetischem chromdioxid

Publications (1)

Publication Number Publication Date
HK56490A true HK56490A (en) 1990-08-03

Family

ID=6268261

Family Applications (1)

Application Number Title Priority Date Filing Date
HK564/90A HK56490A (en) 1985-04-17 1990-07-26 Process for producing ferromagnetic chromium dioxide

Country Status (12)

Country Link
US (1) US4670177A (ja)
EP (1) EP0198110B1 (ja)
JP (1) JPH0744096B2 (ja)
KR (1) KR930009766B1 (ja)
CN (1) CN1007240B (ja)
AT (1) ATE49317T1 (ja)
CA (1) CA1269234A (ja)
DE (2) DE3513723A1 (ja)
HK (1) HK56490A (ja)
SG (1) SG39990G (ja)
SU (1) SU1718720A3 (ja)
ZA (1) ZA855953B (ja)

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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
DE3718299A1 (de) * 1987-05-30 1988-12-15 Basf Ag Verfahren zur herstellung von stabilisiertem nadelfoermigem ferromagnetischem chromdioxid
DE3941578A1 (de) * 1989-12-16 1991-06-20 Basf Ag Verfahren zur herstellung von stabilisiertem chromdioxid und magnetischer aufzeichnungstraeger enthaltend dieses material
DE4339841A1 (de) * 1993-11-23 1995-05-24 Basf Magnetics Gmbh Feinteiliges nadfelförmiges magnetisches modifiziertes Chromdioxid
DE4412611C2 (de) * 1994-04-13 2003-02-27 Emtec Magnetics Gmbh Verfahren zur Herstellung von feinteiligem ferromagnetischem Chromdioxid
DE19714161A1 (de) * 1997-04-05 1998-10-08 Emtec Magnetics Gmbh Magnetischer Aufzeichnungsträger
CN102604031B (zh) * 2012-03-13 2013-10-30 金坛市开瑞源光电科技有限公司 聚酯类聚氨酯弹性体的制备方法和应用

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3034988A (en) * 1958-08-22 1962-05-15 Du Pont Modified chromium oxide ferromagnetic compositions, their preparation and use
US3278263A (en) * 1964-11-27 1966-10-11 Du Pont Ferromagnetic chromium dioxide and preparation thereof
US3449073A (en) * 1965-12-14 1969-06-10 Du Pont Process for preparing chromium dioxide and product thereof
DE2022820C3 (de) * 1970-05-11 1980-01-03 Basf Ag, 6700 Ludwigshafen Verfahren zur Herstellung von hochkoerzitivem Chromdioxid
US3778373A (en) * 1971-11-08 1973-12-11 Bell & Howell Co Iron containing ferromagnetic chromium oxide
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
DE2942646A1 (de) * 1979-10-22 1981-04-30 Basf Ag, 6700 Ludwigshafen Verfahren zur herstellung von ferromagnetischem chromdioxid
US4524008A (en) * 1983-12-16 1985-06-18 E. I. Du Pont De Nemours And Company Controlled initiation chromium dioxide synthesis

Also Published As

Publication number Publication date
JPH0744096B2 (ja) 1995-05-15
KR860008090A (ko) 1986-11-12
KR930009766B1 (ko) 1993-10-09
CN1007240B (zh) 1990-03-21
DE3575218D1 (de) 1990-02-08
EP0198110A2 (de) 1986-10-22
ZA855953B (en) 1986-04-30
EP0198110A3 (en) 1988-07-06
DE3513723A1 (de) 1986-10-23
JPS61241902A (ja) 1986-10-28
ATE49317T1 (de) 1990-01-15
EP0198110B1 (de) 1990-01-03
SG39990G (en) 1990-08-03
CA1269234A (en) 1990-05-22
US4670177A (en) 1987-06-02
CN85106854A (zh) 1987-02-25
SU1718720A3 (ru) 1992-03-07

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