FR2060273A1 - Acicular iron oxide prodn - Google Patents

Acicular iron oxide prodn

Info

Publication number
FR2060273A1
FR2060273A1 FR6932741A FR6932741A FR2060273A1 FR 2060273 A1 FR2060273 A1 FR 2060273A1 FR 6932741 A FR6932741 A FR 6932741A FR 6932741 A FR6932741 A FR 6932741A FR 2060273 A1 FR2060273 A1 FR 2060273A1
Authority
FR
France
Prior art keywords
iron oxide
degrees
acicular iron
excess
hydroxide
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.)
Granted
Application number
FR6932741A
Other languages
French (fr)
Other versions
FR2060273B1 (en
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.)
Kodak Pathe SA
Original Assignee
Kodak Pathe SA
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 to BE756608D priority Critical patent/BE756608A/en
Application filed by Kodak Pathe SA filed Critical Kodak Pathe SA
Priority to FR6932741A priority patent/FR2060273A1/en
Priority to GB4356670A priority patent/GB1328115A/en
Priority to DE19702047181 priority patent/DE2047181C3/en
Priority to JP45083524A priority patent/JPS5017198B1/ja
Publication of FR2060273A1 publication Critical patent/FR2060273A1/en
Application granted granted Critical
Publication of FR2060273B1 publication Critical patent/FR2060273B1/fr
Priority to US05/522,810 priority patent/US4255492A/en
Granted 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
    • 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
    • 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
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
    • C01P2004/00—Particle morphology
    • C01P2004/01—Particle morphology depicted by an image
    • C01P2004/03—Particle morphology depicted by an image obtained by SEM
    • 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
    • C01P2004/54—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
    • C01P2004/62—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

Abstract

Prepn. of acicular goethite (alpha FeO.OH) which can readily be made into magnetic gamma Fe2O3, which comprises precipitating ferrous hydroxide at 60 degrees C using an excess of alkali such that no local excess of Fe++ ions occurs, oxidising this hydroxide at 20-60 degrees C, and then bringing the suspn. to the boil to complete crystallisation. The final concn. of alpha FeO.OH, which should have a particle size 0.5 mu, must be 15 gpl. The appts. used for the pptn. and oxidn. is a casting dish of FR 1157156.
FR6932741A 1969-09-16 1969-09-25 Acicular iron oxide prodn Granted FR2060273A1 (en)

Priority Applications (6)

Application Number Priority Date Filing Date Title
BE756608D BE756608A (en) 1969-09-25 PROCESS FOR PREPARING IRON OXIDE, ACICULAR, OR GOETHITE, USABLE FOR THE PRODUCTION OF MAGNETIC GAMMA-FE203 IRON OXIDE
FR6932741A FR2060273A1 (en) 1969-09-25 1969-09-25 Acicular iron oxide prodn
GB4356670A GB1328115A (en) 1969-09-16 1970-09-11 Manufacture of goethite
DE19702047181 DE2047181C3 (en) 1969-09-25 1970-09-24 Process for the production of fine Goethite crystals
JP45083524A JPS5017198B1 (en) 1969-09-25 1970-09-25
US05/522,810 US4255492A (en) 1969-09-25 1974-11-11 Magnetic recording crystals, process for producing same, and magnetic recording webs using same

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR6932741A FR2060273A1 (en) 1969-09-25 1969-09-25 Acicular iron oxide prodn

Publications (2)

Publication Number Publication Date
FR2060273A1 true FR2060273A1 (en) 1971-06-18
FR2060273B1 FR2060273B1 (en) 1974-02-01

Family

ID=9040606

Family Applications (1)

Application Number Title Priority Date Filing Date
FR6932741A Granted FR2060273A1 (en) 1969-09-16 1969-09-25 Acicular iron oxide prodn

Country Status (4)

Country Link
JP (1) JPS5017198B1 (en)
BE (1) BE756608A (en)
DE (1) DE2047181C3 (en)
FR (1) FR2060273A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2487326A1 (en) * 1980-07-24 1982-01-29 Kodak Pathe PROCESS FOR THE PREPARATION OF ACIDIC PARTICLES OF MAGNETIC IRON OXIDE

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4255492A (en) 1969-09-25 1981-03-10 Eastman Kodak Company Magnetic recording crystals, process for producing same, and magnetic recording webs using same

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2558304A (en) * 1948-03-11 1951-06-26 American Cyanamid Co Production of iron oxide pigments
FR1157156A (en) * 1956-08-03 1958-05-27 Kodak Pathe New process for dispersing a fluid in a highly divided state in a liquid mass and device for implementing this process
FR1357866A (en) * 1963-03-29 1964-04-10 Basf Ag Process for the production of acicular alpha yellow iron oxide, particularly suitable as a starting material for the production of highly coercive iron-iii-gamma oxide
US3252758A (en) * 1960-12-15 1966-05-24 Bayer Ag Gamma-ferric-oxide crystals and processes for their production

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2558304A (en) * 1948-03-11 1951-06-26 American Cyanamid Co Production of iron oxide pigments
FR1157156A (en) * 1956-08-03 1958-05-27 Kodak Pathe New process for dispersing a fluid in a highly divided state in a liquid mass and device for implementing this process
US3252758A (en) * 1960-12-15 1966-05-24 Bayer Ag Gamma-ferric-oxide crystals and processes for their production
FR1357866A (en) * 1963-03-29 1964-04-10 Basf Ag Process for the production of acicular alpha yellow iron oxide, particularly suitable as a starting material for the production of highly coercive iron-iii-gamma oxide

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2487326A1 (en) * 1980-07-24 1982-01-29 Kodak Pathe PROCESS FOR THE PREPARATION OF ACIDIC PARTICLES OF MAGNETIC IRON OXIDE

Also Published As

Publication number Publication date
DE2047181C3 (en) 1980-11-27
JPS5017198B1 (en) 1975-06-19
DE2047181B2 (en) 1980-03-27
FR2060273B1 (en) 1974-02-01
DE2047181A1 (en) 1971-04-08
BE756608A (en) 1971-03-24

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