GB1458623A - Production of acicular cobalt-containing ferri-magnetic iron oxides - Google Patents

Production of acicular cobalt-containing ferri-magnetic iron oxides

Info

Publication number
GB1458623A
GB1458623A GB2260274A GB2260274A GB1458623A GB 1458623 A GB1458623 A GB 1458623A GB 2260274 A GB2260274 A GB 2260274A GB 2260274 A GB2260274 A GB 2260274A GB 1458623 A GB1458623 A GB 1458623A
Authority
GB
United Kingdom
Prior art keywords
solution
cobalt
ions
production
acicular
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
GB2260274A
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
Application filed by Bayer AG filed Critical Bayer AG
Publication of GB1458623A publication Critical patent/GB1458623A/en
Expired legal-status Critical Current

Links

Classifications

    • 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
    • G11B5/70652—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
    • G11B5/70668—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 containing a dopant
    • G11B5/70673—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 containing a dopant containing Co

Abstract

1458623 Acicular cobalt-containing γ-ferric oxide BAYER AG 21 May 1974 [22 May 1973] 22602/74 Heading C1A A process for the production of a ferromagnetic, acicular, highly coercive cobaltcontaining iron oxide comprises adding a solution of a basic precipitant and an oxidizing agent (e.g. sodium hydroxide solution and air respectively) to an aqueous solution of iron (II) and cobalt (II) ions at a pH value of from 4 to 6 at such rates that the pH value of the solution varies by at most Œ0À2 pH units and the resulting precipitate of α-(Fe, Co)O.OH pigment is formed at a volume-time yield of 2 to 15 g./l./h., based on the suspension volume, and then drying, reducing and optionally reoxidizing the pigment. The solution of iron (II) and cobalt (II) ions may also contain other divalent metal ions, for example, divalent zinc, cadmium, manganese or lead ions, or any combination thereof. The product is suitable for incorporation into magnetic recording media.
GB2260274A 1973-05-22 1974-05-21 Production of acicular cobalt-containing ferri-magnetic iron oxides Expired GB1458623A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19732325925 DE2325925A1 (en) 1973-05-22 1973-05-22 Process for the preparation of acicular cobalt-containing ferrimagnetic iron oxides

Publications (1)

Publication Number Publication Date
GB1458623A true GB1458623A (en) 1976-12-15

Family

ID=5881735

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2260274A Expired GB1458623A (en) 1973-05-22 1974-05-21 Production of acicular cobalt-containing ferri-magnetic iron oxides

Country Status (7)

Country Link
JP (1) JPS5019699A (en)
BE (1) BE815266A (en)
DE (1) DE2325925A1 (en)
FR (1) FR2230590B1 (en)
GB (1) GB1458623A (en)
IT (1) IT1011466B (en)
NL (1) NL7406765A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4259368A (en) 1979-04-23 1981-03-31 Basf Aktiengesellschaft Manufacture of acicular magnetic iron oxide
EP0126042A2 (en) 1983-03-18 1984-11-21 Adcon AB Method and apparatus for dyeing cellulose fiber material

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2705967C2 (en) * 1977-02-12 1990-01-04 Basf Ag, 6700 Ludwigshafen Process for the production of acicular cobalt-containing magnetic iron oxide
JPS5819733A (en) * 1981-07-28 1983-02-04 Toshiba Corp Magnetic recording medium and its manufacture
DE3345532A1 (en) * 1983-12-16 1985-06-27 Basf Ag, 6700 Ludwigshafen METHOD FOR PRODUCING COBALTIC, ISOTROPPER MAGNETIC IRON OXIDES
DE3345531A1 (en) * 1983-12-16 1985-06-27 Basf Ag, 6700 Ludwigshafen METHOD FOR PRODUCING COBALTIC, ISOTROPPER MAGNETIC IRON OXIDES
DE3435698A1 (en) * 1984-09-28 1986-04-03 Basf Ag, 6700 Ludwigshafen METHOD FOR PRODUCING FINE-PARTICLE ISOTROPIC FERRITE POWDER WITH SPINEL STRUCTURE

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1592398A1 (en) * 1967-02-08 1970-12-17 Bayer Ag Use of highly coercive needle-like gamma-Fe2O3 for the production of magnetogram carriers
DE2100390A1 (en) * 1970-03-11 1971-09-30 Ampex Doped acicular gamma ferric oxide preparation - tion

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4259368A (en) 1979-04-23 1981-03-31 Basf Aktiengesellschaft Manufacture of acicular magnetic iron oxide
EP0126042A2 (en) 1983-03-18 1984-11-21 Adcon AB Method and apparatus for dyeing cellulose fiber material

Also Published As

Publication number Publication date
FR2230590A1 (en) 1974-12-20
JPS5019699A (en) 1975-03-01
BE815266A (en) 1974-11-20
DE2325925A1 (en) 1974-12-12
FR2230590B1 (en) 1978-01-27
IT1011466B (en) 1977-01-20
NL7406765A (en) 1974-11-26

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Legal Events

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