EP0024694A3 - Process for preparing ferromagnetic acicular iron particles, and their use - Google Patents

Process for preparing ferromagnetic acicular iron particles, and their use Download PDF

Info

Publication number
EP0024694A3
EP0024694A3 EP80104979A EP80104979A EP0024694A3 EP 0024694 A3 EP0024694 A3 EP 0024694A3 EP 80104979 A EP80104979 A EP 80104979A EP 80104979 A EP80104979 A EP 80104979A EP 0024694 A3 EP0024694 A3 EP 0024694A3
Authority
EP
European Patent Office
Prior art keywords
iron particles
acicular iron
preparing ferromagnetic
ferromagnetic acicular
preparing
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
EP80104979A
Other languages
English (en)
Other versions
EP0024694B1 (de
EP0024694A2 (de
Inventor
Werner Dr. Steck
Wilhelm Dr. Sarnecki
Laszlo Dr. Marosi
Manfred Dr. Ohlinger
Werner Dr. Loeser
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.)
BASF SE
Original Assignee
BASF SE
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 BASF SE filed Critical BASF SE
Publication of EP0024694A2 publication Critical patent/EP0024694A2/de
Publication of EP0024694A3 publication Critical patent/EP0024694A3/de
Application granted granted Critical
Publication of EP0024694B1 publication Critical patent/EP0024694B1/de
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F1/00—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties
    • H01F1/01—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials
    • H01F1/03—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity
    • H01F1/032—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of hard-magnetic materials
    • H01F1/04—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of hard-magnetic materials metals or alloys
    • H01F1/06—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of hard-magnetic materials metals or alloys in the form of particles, e.g. powder
    • H01F1/065—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of hard-magnetic materials metals or alloys in the form of particles, e.g. powder obtained by a reduction
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F9/00—Making metallic powder or suspensions thereof
    • B22F9/16—Making metallic powder or suspensions thereof using chemical processes
    • B22F9/18—Making metallic powder or suspensions thereof using chemical processes with reduction of metal compounds
    • B22F9/20—Making metallic powder or suspensions thereof using chemical processes with reduction of metal compounds starting from solid metal compounds
    • B22F9/22—Making metallic powder or suspensions thereof using chemical processes with reduction of metal compounds starting from solid metal compounds using gaseous reductors
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F1/00—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties
    • H01F1/01—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials
    • H01F1/03—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity
    • H01F1/032—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of hard-magnetic materials
    • H01F1/04—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of hard-magnetic materials metals or alloys
    • H01F1/06—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of hard-magnetic materials metals or alloys in the form of particles, e.g. powder
    • H01F1/061—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of hard-magnetic materials metals or alloys in the form of particles, e.g. powder with a protective layer
EP80104979A 1979-09-01 1980-08-21 Verfahren zur Herstellung nadelförmiger ferromagnetischer Eisenteilchen und deren Verwendung Expired EP0024694B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19792935358 DE2935358A1 (de) 1979-09-01 1979-09-01 Verfahren zur herstellung nadelfoermiger ferromagnetischer eisenteilchen und deren verwendung
DE2935358 1979-09-01

Publications (3)

Publication Number Publication Date
EP0024694A2 EP0024694A2 (de) 1981-03-11
EP0024694A3 true EP0024694A3 (en) 1981-08-26
EP0024694B1 EP0024694B1 (de) 1983-09-28

Family

ID=6079797

Family Applications (1)

Application Number Title Priority Date Filing Date
EP80104979A Expired EP0024694B1 (de) 1979-09-01 1980-08-21 Verfahren zur Herstellung nadelförmiger ferromagnetischer Eisenteilchen und deren Verwendung

Country Status (4)

Country Link
US (1) US4344791A (de)
EP (1) EP0024694B1 (de)
JP (1) JPS5638405A (de)
DE (2) DE2935358A1 (de)

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS596502A (ja) * 1982-07-05 1984-01-13 Mitsui Toatsu Chem Inc 改良された強磁性鉄粉の製造方法
DE3228669A1 (de) * 1982-07-31 1984-02-02 Basf Ag, 6700 Ludwigshafen Verfahren zur herstellung nadelfoermiger, im wesentlichen aus eisen bestehender ferromagnetischer metallteilchen
JPS59157204A (ja) * 1983-02-23 1984-09-06 Chisso Corp 強磁性金属微粒子の製造方法
US4464196A (en) * 1983-08-24 1984-08-07 Hercules Incorporated Acicular ferromagnetic metal particles
JP2582764B2 (ja) * 1986-02-05 1997-02-19 バスフ アクチェン ゲゼルシャフト 本質的に鉄から成る針状強磁性金属粉末の製造方法
US5069216A (en) 1986-07-03 1991-12-03 Advanced Magnetics Inc. Silanized biodegradable super paramagnetic metal oxides as contrast agents for imaging the gastrointestinal tract
US5219554A (en) 1986-07-03 1993-06-15 Advanced Magnetics, Inc. Hydrated biodegradable superparamagnetic metal oxides
JPH03194905A (ja) * 1989-12-22 1991-08-26 Ishihara Sangyo Kaisha Ltd 磁気記録用金属磁性粉末の製造方法
SE9401392D0 (sv) * 1994-04-25 1994-04-25 Hoeganaes Ab Heat-treating of iron powders
US8911663B2 (en) * 2009-03-05 2014-12-16 Quebec Metal Powders, Ltd. Insulated iron-base powder for soft magnetic applications

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH528320A (de) * 1969-04-17 1972-09-30 Stamicarbon Verfahren zur Herstellung von dauermagnetisierbare Teilchen enthaltenden Formkörpern zur magnetischen Speicherung von Informationen und Anwendung des Verfahrens zur Herstellung von flächenartigen Gebilden
FR2368131A1 (fr) * 1976-10-14 1978-05-12 Basf Ag Particules

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1204644B (de) * 1962-03-30 1965-11-11 Basf Ag Verfahren zur Herstellung von insbesondere als Ausgangsmaterial fuer die Herstellung von hochkoerzitivem ª†-Eisen(III)-oxyd geeignetem nadelfoermigem Eisenoxydgelb, alpha-OH
NL162233C (nl) * 1968-03-05 1980-04-15 Philips Nv Werkwijze ter bereiding van een in hoofdzaak uit ijzer bestaand magnetisch stabiel poeder, voor magnetische registratie.
NL163355C (nl) * 1969-04-08 1980-08-15 Philips Nv Werkwijze ter bereiding van een in hoofdzaak uit ijzer bestaand magnetisch stabiel metaalpoeder, voor magnetische registratie.
DE2434058C2 (de) * 1974-07-16 1985-12-19 Basf Ag, 6700 Ludwigshafen Nadelförmige, vorwiegend aus Eisen bestehende ferromagnetische Metallteilchen und Verfahren zu ihrer Herstellung
DE2434096C2 (de) * 1974-07-16 1985-10-17 Basf Ag, 6700 Ludwigshafen Nadelförmige, vorwiegend aus Eisen bestehende ferromagnetische Metallteilchen und Verfahren zu ihrer Herstellung
DE2550308C3 (de) * 1975-11-08 1978-07-13 Basf Ag, 6700 Ludwigshafen Verfahren zur Herstellung von nadeiförmigem a-Eisen(III)-Oxidhydrat
DE2550225C3 (de) * 1975-11-08 1978-06-22 Basf Ag, 6700 Ludwigshafen Verfahren zur Herstellung von nadeiförmigem Y-Eisen(IID-oxid
DE2550307C3 (de) * 1975-11-08 1978-07-06 Basf Ag, 6700 Ludwigshafen Verfahren zur Herstellung von nadeiförmigem Y-Eisen(ni)-Oxid
DE2714588C2 (de) * 1977-04-01 1986-06-05 Basf Ag, 6700 Ludwigshafen Verfahren zur Herstellung nadelförmiger ferromagnetischer Eisenteilchen
JPS5853689B2 (ja) * 1979-01-20 1983-11-30 戸田工業株式会社 針状晶金属鉄磁性粒子粉末の製造法

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH528320A (de) * 1969-04-17 1972-09-30 Stamicarbon Verfahren zur Herstellung von dauermagnetisierbare Teilchen enthaltenden Formkörpern zur magnetischen Speicherung von Informationen und Anwendung des Verfahrens zur Herstellung von flächenartigen Gebilden
FR2368131A1 (fr) * 1976-10-14 1978-05-12 Basf Ag Particules

Also Published As

Publication number Publication date
EP0024694B1 (de) 1983-09-28
JPS5638405A (en) 1981-04-13
DE3065058D1 (en) 1983-11-03
EP0024694A2 (de) 1981-03-11
US4344791A (en) 1982-08-17
DE2935358A1 (de) 1981-03-26

Similar Documents

Publication Publication Date Title
DE3063724D1 (en) Ferromagnetic metallic pigment essentially consisting of iron, and process for its preparation
ZA802919B (en) Pnacreatin pellets and process for the preparation thereof
DE3068158D1 (en) Magnetic recording carrier and process for its manufacture
DE3176436D1 (en) Process for preparing ferromagnetic particles comprising metallic iron
DE3063654D1 (en) Modified acicular magnetic iron oxide, process for its production and its use in producing magnetic-recording supports
DE3061081D1 (en) Cobalt-doped ferrimagnetic iron oxides and process for producing them
DE3063008D1 (en) Method for the preparation of acicular magnetic cobalt containing iron oxide
DE3067620D1 (en) Process for the preparation of acicular ferrimagnetic iron oxide, and its application
JPS5319998A (en) Process for preparing cobalttdoped acicular magnetite particle having magnetic stability
GB2007113B (en) Acicular ferromagnetic metal particles essentially containing iron and their manufacture
DE3065058D1 (en) Process for preparing ferromagnetic acicular iron particles, and their use
DE3067268D1 (en) Process for preparing acicular ferromagnetic iron particles, and their use
JPS5330497A (en) Cobalttdoped acicular magnetic iron oxide and process for preparing same
GB2072639B (en) Process for preparing iron or iron compound particles for use in magnetic recording
DE3379946D1 (en) Process for the preparation of acicular ferromagnetic iron oxides
DE3167164D1 (en) Process for preparing ferromagnetic particles comprising metallic iron
JPS5689764A (en) Magnetic parts used in magneticcbrush developmenttdevice
JPS52135895A (en) Process for preparing cobaltt modified acicular crystal magnetic ironoxide particle
JPS5666857A (en) Magnetic toner composition and preparing same
DE3160523D1 (en) Process for preparing acicular ferromagnetic particles mainly consisting of iron
JPS5358497A (en) Cobalttdoped acicular magnetic iron oxide and process for preparing same
DE3063101D1 (en) Polyalkylhydroxychromene and process for preparing the same
DE3061463D1 (en) Method for the preparation of acicular ferromagnetic iron particles
GB8318707D0 (en) Producing cobalt and ferrous iron
PT69832A (en) Process for preparing 2-azaergolines and 2-aza-8-(or 9)-ergolines

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Designated state(s): DE FR GB NL

PUAL Search report despatched

Free format text: ORIGINAL CODE: 0009013

AK Designated contracting states

Designated state(s): DE FR GB NL

17P Request for examination filed

Effective date: 19810715

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Designated state(s): DE FR GB NL

REF Corresponds to:

Ref document number: 3065058

Country of ref document: DE

Date of ref document: 19831103

ET Fr: translation filed
PLBE No opposition filed within time limit

Free format text: ORIGINAL CODE: 0009261

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT

26N No opposition filed
PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: FR

Payment date: 19930714

Year of fee payment: 14

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: GB

Payment date: 19930816

Year of fee payment: 14

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: NL

Payment date: 19930831

Year of fee payment: 14

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: GB

Effective date: 19940821

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: NL

Effective date: 19950301

NLV4 Nl: lapsed or anulled due to non-payment of the annual fee
GBPC Gb: european patent ceased through non-payment of renewal fee

Effective date: 19940821

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: FR

Effective date: 19950428

REG Reference to a national code

Ref country code: FR

Ref legal event code: ST

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: DE

Payment date: 19981023

Year of fee payment: 19

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: DE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20000601