GB1385777A - Magnetic iron oxides and a process for their production - Google Patents

Magnetic iron oxides and a process for their production

Info

Publication number
GB1385777A
GB1385777A GB2056072A GB2056072A GB1385777A GB 1385777 A GB1385777 A GB 1385777A GB 2056072 A GB2056072 A GB 2056072A GB 2056072 A GB2056072 A GB 2056072A GB 1385777 A GB1385777 A GB 1385777A
Authority
GB
United Kingdom
Prior art keywords
feo
ions
pigments
precipitation
oxidation
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
GB2056072A
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.)
Bayer AG
Original Assignee
Bayer 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
Priority claimed from DE19712122312 external-priority patent/DE2122312C3/en
Application filed by Bayer AG filed Critical Bayer AG
Publication of GB1385777A publication Critical patent/GB1385777A/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)
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09C—TREATMENT OF INORGANIC MATERIALS, OTHER THAN FIBROUS FILLERS, TO ENHANCE THEIR PIGMENTING OR FILLING PROPERTIES ; PREPARATION OF CARBON BLACK  ; PREPARATION OF INORGANIC MATERIALS WHICH ARE NO SINGLE CHEMICAL COMPOUNDS AND WHICH ARE MAINLY USED AS PIGMENTS OR FILLERS
    • C09C1/00—Treatment of specific inorganic materials other than fibrous fillers; Preparation of carbon black
    • C09C1/22—Compounds of iron
    • C09C1/24—Oxides of iron
    • 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
    • C01P2004/54—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
    • 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
    • C01P2006/80—Compositional purity

Abstract

1385777 Ferromagnetic iron oxide BAYER AG 3 May 1972 [6 May 1971] 20560/72 Heading ClA [Also in Division C3] Ferromagnetic γ-Fe 2 O 3 is prepared by initially forming needle-shaped α-FeO(OH) pigments by precipitation and oxidation of a suspension containing a Fe (II) salt (e.g. FeSO 4 ), PO 4 <SP>1</SP> ions and seeds of α-FeO(OH) formed by precipitation and oxidation of a solution containing a Fe (II) salt and optionally PO 4 <SP>1</SP> ions, and subsequently dehydrating the α-FeO(OH) pigments to α-Fe 2 O 3 , optionally tempering, reducing to Fe 3 O 4 and then finally reoxidizing to γ-Fe 2 O 3 . The preparation agent may be NaOH, Na 2 CO 3 , NH 3 , metallic Fe or urotropin, the preparation preferably being carried out in acid conditions. The oxidizing agent may be air Cl 2 , ClO 3 <SP>1</SP>, NO 3 <SP>1</SP> or nitrobenzene. The PO 4 <SP>1</SP> ions may be added as phosphoric acids or their water-soluble salts; preferably in an amount to give 0À1-4% by wt. P 2 O 5 in the α-FeO(OH) end product; and either prior to or during seed or pigment formation. The rate of α-FeO(OH) pigment formation may be 0À5-15 g./l./hr at a temp. of 40-95‹ C. The α-FeO(OH) obtained may then be filtered, washed, mashed dispersed refiltered, dried and then dehydrated at 400‹ C', to obtain the α - Fe 2 O 3 ; tempered at 400-900‹ C. for 15-60 mins.; reduced to Fe 3 O 4 at 400-440‹ C. in an atmosphere of H 2 and steam, cooled in N 2 at 250-300‹ C., and then re-oxidized at 290‹ C. to form γ-Fe 2 O 3 .
GB2056072A 1971-05-06 1972-05-03 Magnetic iron oxides and a process for their production Expired GB1385777A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19712122312 DE2122312C3 (en) 1971-05-06 Process for the production of magnetic iron oxides with improved properties

Publications (1)

Publication Number Publication Date
GB1385777A true GB1385777A (en) 1975-02-26

Family

ID=5806972

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2056072A Expired GB1385777A (en) 1971-05-06 1972-05-03 Magnetic iron oxides and a process for their production

Country Status (9)

Country Link
JP (1) JPS553295B1 (en)
BE (1) BE783021A (en)
CA (1) CA995874A (en)
CH (1) CH582111A5 (en)
FR (1) FR2135342B1 (en)
GB (1) GB1385777A (en)
IT (1) IT957712B (en)
NL (1) NL7206131A (en)
PL (1) PL82318B1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3243868A1 (en) * 1981-11-27 1983-06-01 Ishihara Sangyo Kaisha, Ltd., Osaka METHOD FOR PRODUCING NEEDLE SHAPED (ALPHA) FEOOH FOR MAGNETIC RECORDING MATERIALS

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3974079A (en) * 1971-05-06 1976-08-10 Bayer Aktiengesellschaft Production of gamma iron oxide
DE2805405A1 (en) * 1978-02-09 1979-08-16 Basf Ag PROCESS FOR THE PRODUCTION OF NEEDLE-SHAPED FERRIMAGNETIC IRON OXIDES
DE2805621A1 (en) * 1978-02-10 1979-08-23 Basf Ag PROCESS FOR THE PRODUCTION OF NEEDLE-SHAPED FERRIMAGNETIC IRON OXIDES
DE3413752A1 (en) * 1984-04-12 1985-10-24 Basf Ag, 6700 Ludwigshafen METHOD FOR PRODUCING ISOTROPIC MAGNETIC, COBAL-CONTAINING IRON OXIDS

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2388659A (en) * 1943-07-12 1945-11-06 Interchem Corp Manufacture of pigments
FR1587959A (en) * 1967-11-25 1970-04-03

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3243868A1 (en) * 1981-11-27 1983-06-01 Ishihara Sangyo Kaisha, Ltd., Osaka METHOD FOR PRODUCING NEEDLE SHAPED (ALPHA) FEOOH FOR MAGNETIC RECORDING MATERIALS
US4560544A (en) 1981-11-27 1985-12-24 Ishihara Sangyo Kaisha, Ltd. Process for the preparation of acicular α-FeOOH for magnetic recording materials

Also Published As

Publication number Publication date
JPS553295B1 (en) 1980-01-24
CA995874A (en) 1976-08-31
BE783021A (en) 1972-11-06
IT957712B (en) 1973-10-20
FR2135342B1 (en) 1978-09-08
PL82318B1 (en) 1975-10-31
CH582111A5 (en) 1976-11-30
DE2122312A1 (en) 1972-11-23
FR2135342A1 (en) 1972-12-15
NL7206131A (en) 1972-11-08
DE2122312B2 (en) 1976-12-09

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Legal Events

Date Code Title Description
PS Patent sealed
PE20 Patent expired after termination of 20 years