GB1392196A - Synthetic gamma ferric oxide - Google Patents

Synthetic gamma ferric oxide

Info

Publication number
GB1392196A
GB1392196A GB1141272A GB1141272A GB1392196A GB 1392196 A GB1392196 A GB 1392196A GB 1141272 A GB1141272 A GB 1141272A GB 1141272 A GB1141272 A GB 1141272A GB 1392196 A GB1392196 A GB 1392196A
Authority
GB
United Kingdom
Prior art keywords
feo
fecl
march
containing gas
product
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
GB1141272A
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.)
Pfizer Inc
Original Assignee
Pfizer Inc
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 Pfizer Inc filed Critical Pfizer Inc
Publication of GB1392196A publication Critical patent/GB1392196A/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
    • G11B5/70642—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 iron oxides
    • G11B5/70652—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 iron oxides gamma - Fe2 O3
    • G11B5/70663—Preparation processes specially adapted therefor, e.g. using stabilising agents
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01G—COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSES C01D OR C01F
    • C01G49/00—Compounds of iron
    • C01G49/02—Oxides; Hydroxides
    • C01G49/06—Ferric oxide (Fe2O3)
    • 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
    • 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
    • G11B5/70642—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 iron oxides
    • G11B5/70647—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 iron oxides with a skin
    • 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
    • G11B5/70642—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 iron oxides
    • G11B5/70652—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 iron oxides gamma - Fe2 O3
    • 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
    • C01P2004/51—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
    • C01P2004/54—Particles characterised by their aspect ratio, i.e. the ratio of sizes in the longest to the shortest dimension
    • 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
    • C01P2004/61—Micrometer sized, i.e. from 1-100 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
    • C01P2006/40—Electric 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
    • C01P2006/42—Magnetic properties

Landscapes

  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Health & Medical Sciences (AREA)
  • Dermatology (AREA)
  • General Health & Medical Sciences (AREA)
  • Inorganic Chemistry (AREA)
  • Compounds Of Iron (AREA)
  • Hard Magnetic Materials (AREA)
  • Paints Or Removers (AREA)

Abstract

1392196 γ-FeO.OH and γ-Fe 2 O 3 PFIZER Inc 10 March 1972 [17 March 1971 11 Feb 1972] 11412/72 Heading C1A [Also in Division C3] A novel form of γ-FeO.OH particles at least 70% by volume of which have a length : width ratio greater than 10 : 1 and a length of up to 2Á are prepared by reacting an aqueous FeCl 2 solution of concentration 0À25-5 lb. per U.S. gal. with an O 2 -containing gas and an aqueous base until the pH is 2À9-4À1 to form a seed slurry of FeO.OH and then maintaining a temperature of 80-140‹ F. and a pH of 2À9-4À1 in the presence of FeCl 2 and simultaneously and continuously introducing a base and an O 2 - containing gas until 1À2 to 5 parts by weight of product are formed per part of seed. The aqueous base may be NaOH, NH 4 OH or Ca(OH) 2 . Metallic iron may be present during the second part of the process. FeSO 4 and Fe(NO 3 ) 2 may be used along with FeCl 2 . γ-Fe 2 O 3 may be obtained by reducing the FeO.OH to Fe 3 O 4 with H 2 at 600-800‹ F. and oxidizing to Fe 2 O 3 with air at 450-720‹ F. The FeO.OH may first be coated with an aliphatic monocarboxylic acid having 8-24 C atoms, e.g. coconut oil fatty acid or lauric acid, and the H 2 for reduction may then be omitted. The product may be densified by milling.
GB1141272A 1971-03-17 1972-03-10 Synthetic gamma ferric oxide Expired GB1392196A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US12533171A 1971-03-17 1971-03-17
US22563672A 1972-02-11 1972-02-11

Publications (1)

Publication Number Publication Date
GB1392196A true GB1392196A (en) 1975-04-30

Family

ID=26823475

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1141272A Expired GB1392196A (en) 1971-03-17 1972-03-10 Synthetic gamma ferric oxide

Country Status (14)

Country Link
JP (1) JPS5549016B1 (en)
AR (1) AR199878A1 (en)
AU (1) AU442230B2 (en)
BE (1) BE780830A (en)
CA (1) CA980536A (en)
CH (1) CH547234A (en)
DE (1) DE2212435C3 (en)
FI (1) FI54284C (en)
FR (1) FR2130407B1 (en)
GB (1) GB1392196A (en)
IE (1) IE36177B1 (en)
IT (1) IT957573B (en)
NL (1) NL167660C (en)
SE (1) SE389329B (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4755395A (en) * 1985-05-10 1988-07-05 Basf Aktiengesellschaft Preparation of acicular cobalt-containing ferrimagnetic iron oxides
US4764300A (en) * 1985-05-23 1988-08-16 Basf Aktiengesellschaft Preparation of finely divided and acicular hexagonal ferrites and their use for the production of magnetic recording media and plastoferrites

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2735316C3 (en) * 1977-08-05 1981-01-29 Basf Ag, 6700 Ludwigshafen Process for the production of acicular, ferrimagnetic iron oxides
DE2801395C2 (en) * 1978-01-13 1982-04-22 Bayer Ag, 5090 Leverkusen Thermally stabilized ferrimagnetic iron oxide
DE2805405A1 (en) * 1978-02-09 1979-08-16 Basf Ag PROCESS FOR THE PRODUCTION OF NEEDLE-SHAPED FERRIMAGNETIC IRON OXIDES
DE2945203A1 (en) * 1979-11-09 1981-06-04 Basf Ag, 6700 Ludwigshafen METHOD FOR PRODUCING (GAMMA) IRON (III) OXIDE
JPS5816364U (en) * 1981-07-25 1983-02-01 株式会社新潟鐵工所 Timing adjustment device for concrete pumps
DE3224325A1 (en) * 1982-06-30 1984-01-05 Basf Ag, 6700 Ludwigshafen METHOD FOR PRODUCING NEEDLE-SHAPED, FERRIMAGNETIC IRON OXIDES
DE3417793A1 (en) * 1984-05-14 1985-11-14 Basf Ag, 6700 Ludwigshafen METHOD FOR THE PRODUCTION OF FINE-PARTIC, NEEDLE-SHAPED AND HIGH-CERCITIVE HEXAGONAL FERRITES AND THEIR USE FOR THE PRODUCTION OF MAGNETIC RECORDING CARRIERS AND PLASTOFERRITE

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1244896A (en) * 1960-01-11 1960-10-28 C K Williams & Co Process for obtaining ferro-magnetic iron oxide powders, in particular for magnetic recording elements and powders and elements obtained by this process
US3498748A (en) * 1967-05-18 1970-03-03 Pfizer & Co C Preparation of magnetic ferric oxide

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4755395A (en) * 1985-05-10 1988-07-05 Basf Aktiengesellschaft Preparation of acicular cobalt-containing ferrimagnetic iron oxides
US4764300A (en) * 1985-05-23 1988-08-16 Basf Aktiengesellschaft Preparation of finely divided and acicular hexagonal ferrites and their use for the production of magnetic recording media and plastoferrites

Also Published As

Publication number Publication date
NL167660C (en) 1982-01-18
NL167660B (en) 1981-08-17
NL7203583A (en) 1972-09-19
DE2212435B2 (en) 1977-09-01
AR199878A1 (en) 1974-10-08
IE36177B1 (en) 1976-09-01
SE389329B (en) 1976-11-01
CA980536A (en) 1975-12-30
IE36177L (en) 1972-09-17
CH547234A (en) 1974-03-29
FR2130407A1 (en) 1972-11-03
AU442230B2 (en) 1973-11-01
AU4002372A (en) 1973-09-20
BE780830A (en) 1972-09-18
JPS5549016B1 (en) 1980-12-09
FI54284C (en) 1978-11-10
FR2130407B1 (en) 1974-12-13
DE2212435A1 (en) 1972-10-19
IT957573B (en) 1973-10-20
FI54284B (en) 1978-07-31
DE2212435C3 (en) 1978-04-20

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Legal Events

Date Code Title Description
429C Application to amend the specification withdrawn (sect. 29/1949)
PS Patent sealed
732 Registration of transactions, instruments or events in the register (sect. 32/1977)
PCNP Patent ceased through non-payment of renewal fee