DE69021132T2 - Plattenförmige Magnetitteilchen und Verfahren zu ihrer Erzeugung. - Google Patents

Plattenförmige Magnetitteilchen und Verfahren zu ihrer Erzeugung.

Info

Publication number
DE69021132T2
DE69021132T2 DE69021132T DE69021132T DE69021132T2 DE 69021132 T2 DE69021132 T2 DE 69021132T2 DE 69021132 T DE69021132 T DE 69021132T DE 69021132 T DE69021132 T DE 69021132T DE 69021132 T2 DE69021132 T2 DE 69021132T2
Authority
DE
Germany
Prior art keywords
production
plate
magnetite particles
magnetite
particles
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 - Fee Related
Application number
DE69021132T
Other languages
English (en)
Other versions
DE69021132D1 (de
Inventor
Torayuki Honmyo
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.)
Toda Kogyo Corp
Original Assignee
Toda Kogyo Corp
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 Toda Kogyo Corp filed Critical Toda Kogyo Corp
Application granted granted Critical
Publication of DE69021132D1 publication Critical patent/DE69021132D1/de
Publication of DE69021132T2 publication Critical patent/DE69021132T2/de
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Classifications

    • 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
    • C01G49/08—Ferroso-ferric oxide (Fe3O4)
    • 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
    • G11B5/714—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 dimension of the magnetic particles
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
    • C01P2002/00—Crystal-structural characteristics
    • C01P2002/70—Crystal-structural characteristics defined by measured X-ray, neutron or electron diffraction data
    • C01P2002/72—Crystal-structural characteristics defined by measured X-ray, neutron or electron diffraction data by d-values or two theta-values, e.g. as X-ray diagram
    • 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
    • C01P2004/20—Particle morphology extending in two dimensions, e.g. plate-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
    • C01P2004/61—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
    • 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
    • C01P2006/12—Surface area
    • 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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/29—Coated or structually defined flake, particle, cell, strand, strand portion, rod, filament, macroscopic fiber or mass thereof
    • Y10T428/2982—Particulate matter [e.g., sphere, flake, etc.]
DE69021132T 1989-05-31 1990-05-30 Plattenförmige Magnetitteilchen und Verfahren zu ihrer Erzeugung. Expired - Fee Related DE69021132T2 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP14009189 1989-05-31

Publications (2)

Publication Number Publication Date
DE69021132D1 DE69021132D1 (de) 1995-08-31
DE69021132T2 true DE69021132T2 (de) 1996-01-04

Family

ID=15260746

Family Applications (1)

Application Number Title Priority Date Filing Date
DE69021132T Expired - Fee Related DE69021132T2 (de) 1989-05-31 1990-05-30 Plattenförmige Magnetitteilchen und Verfahren zu ihrer Erzeugung.

Country Status (3)

Country Link
US (1) US5411801A (de)
EP (1) EP0401000B1 (de)
DE (1) DE69021132T2 (de)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0466338B1 (de) * 1990-06-26 1995-12-20 Toda Kogyo Corp. Magnetische spindelförmige Eisenlegierungsteilchen und Verfahren zu ihrer Herstellung
JP2974452B2 (ja) * 1991-06-19 1999-11-10 キヤノン株式会社 磁性トナー
US5645652A (en) * 1994-12-13 1997-07-08 Toda Kogyo Corporation Spindle-shaped magnetic iron-based alloy particles containing cobalt and iron as the main ingredients and process for producing the same
US6207253B1 (en) * 1997-12-26 2001-03-27 Toda Kogyo Corporation Acicular hematite particles and magnetic recording medium
CN101851009B (zh) * 2010-06-10 2012-03-07 南京工业大学 朵状四氧化三铁气凝胶颗粒的制备方法
AT519585B1 (de) * 2017-02-02 2021-05-15 Constantia Teich Gmbh Transparenter Lack

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT1008298B (it) * 1974-02-25 1976-11-10 Montedison Spa Metodo per ottenere magnetite a granulometria controllata a partire da soluzioni di solfato ferroso
DE2904491A1 (de) * 1979-02-07 1980-08-21 Bayer Ag Plaettchenfoermige eisenoxidpigmente und verfahren zu deren herstellung sowie deren verwendung
US4382822A (en) * 1979-09-14 1983-05-10 Pfizer Inc. Synthetic rhombohedral magnetite pigment
US4865834A (en) * 1987-02-16 1989-09-12 Toda Kogyo Corp. Process for producing plate-like magnetite particles and plate-like maghemite particles
JP2583087B2 (ja) * 1987-12-29 1997-02-19 戸田工業株式会社 板状マグネタイト粒子粉末の製造法
EP0306224B1 (de) * 1987-08-28 1991-10-16 Toda Kogyo Corp. Goldfarbiges Eisenoxidpigment und Verfahren zu seiner Herstellung

Also Published As

Publication number Publication date
US5411801A (en) 1995-05-02
EP0401000B1 (de) 1995-07-26
EP0401000A2 (de) 1990-12-05
EP0401000A3 (de) 1991-04-10
DE69021132D1 (de) 1995-08-31

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Legal Events

Date Code Title Description
8364 No opposition during term of opposition
8339 Ceased/non-payment of the annual fee