GB1435392A - Stabilized chromium dioxide - Google Patents

Stabilized chromium dioxide

Info

Publication number
GB1435392A
GB1435392A GB2495073A GB2495073A GB1435392A GB 1435392 A GB1435392 A GB 1435392A GB 2495073 A GB2495073 A GB 2495073A GB 2495073 A GB2495073 A GB 2495073A GB 1435392 A GB1435392 A GB 1435392A
Authority
GB
United Kingdom
Prior art keywords
cro
particles
slurry
salts
oxides
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
GB2495073A
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.)
Montedison SpA
Original Assignee
Montedison SpA
Montecatini Edison 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
Priority claimed from IT2477372A external-priority patent/IT955797B/en
Priority claimed from IT2139873A external-priority patent/IT1045821B/en
Application filed by Montedison SpA, Montecatini Edison SpA filed Critical Montedison SpA
Publication of GB1435392A publication Critical patent/GB1435392A/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
    • C01P2002/00—Crystal-structural characteristics
    • C01P2002/70—Crystal-structural characteristics defined by measured X-ray, neutron or electron diffraction data
    • C01P2002/72—Crystal-structural characteristics defined by measured X-ray, neutron or electron diffraction data by d-values or two theta-values, e.g. as X-ray diagram
    • 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)
  • Paints Or Removers (AREA)
  • Hard Magnetic Materials (AREA)
  • Inorganic Compounds Of Heavy Metals (AREA)

Abstract

1435392 Coated CrO 2 MONTECATINI EDISON SpA 24 May 1973 [24 May 1972 9 March 1973] 24950/73 Heading C1A Ferromagnetic CrO 2 particles are coated with one or more insoluble or sparingly soluble compounds selected from salts having a MoO 4 <SP>2-</SP>, WO 4 <SP>2-</SP> or PO 4 <SP>3-</SP> anion, salts having a Mg, Zn, Ce, La, Fe, Mn or Co cation, and oxides, hydrated oxides or hydroxides of Si or Ti. Exemplified salts are La 2 (MOO 4 ) 3 , BaMoO 4 , MgWO 4 , CaWO 4 , Mn 3 (PO 4 ) 2 , Pb 3 (PO 4 ) 2 , Zn 3 (PO 4 ) 2 and AlPO 4 , which are obtained by double decomposition of a water soluble metal compound with the corresponding Na molybdate &c., followed by neutralization with NaOH, in an aqueous slurry of the CrO 2 . The deposit is present in amounts of 0À1-25% wt. of particles. The deposit may further contain oxide, hydroxide or hydrated oxide of Sb and one or more compounds of Al, Ca, Sr, Ba or Pb. Exemplified oxides are SiO 2 , TiO 2 , and mixtures of Si with Al and Ti with Al, which are obtained by hydrolysis of H 2 SiF 6 , TiOSO 4 or Al 2 (SO 4 ) 3 with NaOH, or by reaction of Na silicate with Al 2 (SO 4 ) 3 , in the aqueous CrO 2 slurry. The particles may then be washed, and dried at 110‹ C. or 250‹ C. In Example 11, SiCl 4 is added to a slurry of humidified CrO 2 in hexane and the slurry evaporated to dryness. The initial CrO 2 particles may be modified with La 2 O 3 , and may be obtained as described in Specification 1,426,526.
GB2495073A 1972-05-24 1973-05-24 Stabilized chromium dioxide Expired GB1435392A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT2477372A IT955797B (en) 1972-05-24 1972-05-24 STABILIZED CHROME DIOXIDE
IT2139873A IT1045821B (en) 1973-03-09 1973-03-09 Stabilised chromium dioxide prepn - by coating with insol metal salts, oxides or hydroxides

Publications (1)

Publication Number Publication Date
GB1435392A true GB1435392A (en) 1976-05-12

Family

ID=26327886

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2495073A Expired GB1435392A (en) 1972-05-24 1973-05-24 Stabilized chromium dioxide

Country Status (8)

Country Link
JP (1) JPS4949898A (en)
CA (1) CA1013130A (en)
CH (1) CH604343A5 (en)
DE (1) DE2325719A1 (en)
FR (1) FR2185840B1 (en)
GB (1) GB1435392A (en)
NL (1) NL7306877A (en)
SE (1) SE404274B (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0239087A2 (en) * 1986-03-27 1987-09-30 BASF Aktiengesellschaft Process for the stabilization of acicular ferromagnetic chromium dioxide

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2386486A1 (en) * 1977-04-07 1978-11-03 Montedison Spa STABILIZED FERROMAGNETIC CHROME BIOXIDE AND ITS PREPARATION PROCESS
JPS55132005A (en) * 1979-04-02 1980-10-14 Ken Namikawa Ferromagnetic powder and manufacture therefor
US4382982A (en) * 1979-12-07 1983-05-10 Ici Australia Limited Process for protecting magnetic particles with chromium oxide
NL8100014A (en) * 1981-01-06 1982-08-02 Philips Nv MAGNETIC REGISTRATION ELEMENT AND METHODS FOR MANUFACTURING IT.

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3686031A (en) * 1969-11-26 1972-08-22 Du Pont Metal phosphate coated ferromagnetic chromium oxide and its preparation

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0239087A2 (en) * 1986-03-27 1987-09-30 BASF Aktiengesellschaft Process for the stabilization of acicular ferromagnetic chromium dioxide
EP0239087A3 (en) * 1986-03-27 1988-07-27 Basf Aktiengesellschaft Process for the stabilization of acicular ferromagnetic chromium dioxide

Also Published As

Publication number Publication date
CH604343A5 (en) 1978-09-15
SE404274B (en) 1978-09-25
DE2325719A1 (en) 1973-12-13
JPS4949898A (en) 1974-05-15
CA1013130A (en) 1977-07-05
FR2185840B1 (en) 1976-06-11
FR2185840A1 (en) 1974-01-04
NL7306877A (en) 1973-11-27

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Legal Events

Date Code Title Description
PS Patent sealed
PCNP Patent ceased through non-payment of renewal fee