DE69523495T2 - Co-beschichtete nadelförmige Magnetitteilchen und Verfahren zu ihrer Herstellung - Google Patents

Co-beschichtete nadelförmige Magnetitteilchen und Verfahren zu ihrer Herstellung

Info

Publication number
DE69523495T2
DE69523495T2 DE69523495T DE69523495T DE69523495T2 DE 69523495 T2 DE69523495 T2 DE 69523495T2 DE 69523495 T DE69523495 T DE 69523495T DE 69523495 T DE69523495 T DE 69523495T DE 69523495 T2 DE69523495 T2 DE 69523495T2
Authority
DE
Germany
Prior art keywords
manufacture
magnetite particles
acicular magnetite
coated acicular
coated
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
DE69523495T
Other languages
English (en)
Other versions
DE69523495D1 (de
Inventor
Minoru Yamasaki
Junichi Kawano
Hideaki Sadamura
Katsumi Yamashita
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
Publication of DE69523495D1 publication Critical patent/DE69523495D1/de
Application granted granted Critical
Publication of DE69523495T2 publication Critical patent/DE69523495T2/de
Anticipated expiration legal-status Critical
Expired - Fee Related 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
    • G11B5/70678—Ferrites
    • 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
    • G11B5/70678—Ferrites
    • G11B5/70684—Ferro-ferrioxydes
    • G11B5/70689—Magnetite
    • 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
    • G11B5/712—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 surface treatment or coating of magnetic particles
    • 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
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S428/00—Stock material or miscellaneous articles
    • Y10S428/90—Magnetic feature
    • 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.]
    • Y10T428/2991—Coated
    • 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.]
    • Y10T428/2991—Coated
    • Y10T428/2993—Silicic or refractory material containing [e.g., tungsten oxide, glass, cement, etc.]
DE69523495T 1994-03-04 1995-03-02 Co-beschichtete nadelförmige Magnetitteilchen und Verfahren zu ihrer Herstellung Expired - Fee Related DE69523495T2 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP06003694A JP3389935B2 (ja) 1994-03-04 1994-03-04 針状コバルト被着型マグネタイト粒子粉末及びその製造法

Publications (2)

Publication Number Publication Date
DE69523495D1 DE69523495D1 (de) 2001-12-06
DE69523495T2 true DE69523495T2 (de) 2002-05-29

Family

ID=13130451

Family Applications (1)

Application Number Title Priority Date Filing Date
DE69523495T Expired - Fee Related DE69523495T2 (de) 1994-03-04 1995-03-02 Co-beschichtete nadelförmige Magnetitteilchen und Verfahren zu ihrer Herstellung

Country Status (4)

Country Link
US (2) US5626962A (de)
EP (1) EP0671729B1 (de)
JP (1) JP3389935B2 (de)
DE (1) DE69523495T2 (de)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0740183B1 (de) * 1995-04-24 2002-02-20 DAINICHI SEIKA COLOR & CHEMICALS MFG. CO. LTD. Zusammensetzung für eine Schwarzmatrix, Herstellung einer Schwarzmatrix und Gegenstand mit einer solchen Matrix
JPH09134522A (ja) * 1995-11-08 1997-05-20 Kao Corp 磁気記録媒体
JP3427871B2 (ja) * 1996-06-24 2003-07-22 戸田工業株式会社 コバルト被着型針状磁性酸化鉄粒子粉末
JP3737617B2 (ja) * 1997-10-30 2006-01-18 日鉄鉱業株式会社 膜被覆粉体の製造方法
US20070292339A1 (en) * 2004-03-23 2007-12-20 Kanazawa R And D Ltd. Iron Oxide Whisker of High Aspect Ratio, Titanium Oxide Whisker of High Aspect Ratio, Structure Containing These and Process for Producing Them
US9045645B2 (en) * 2010-08-05 2015-06-02 Cathay Pigments USA, Inc. Inorganic oxide powder
WO2012048985A1 (de) * 2010-10-15 2012-04-19 Evonik Degussa Gmbh Umhüllte eisenoxidpartikel
WO2014208731A1 (ja) * 2013-06-28 2014-12-31 富士フイルム株式会社 磁気記録用六方晶フェライト磁性粉、六方晶フェライト磁性粒子の製造方法、および磁気記録媒体

Family Cites Families (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2916403A1 (de) * 1979-04-23 1980-11-06 Basf Ag Nadelfoermiges magnetisches eisenoxid und verfahren zu seiner herstellung
US4657816A (en) * 1982-04-19 1987-04-14 Memorex Corporation Ferromagnetic recording materials
AU558199B2 (en) * 1982-09-16 1987-01-22 Ishihara Sangyo Kaisha Ltd. Production of magnetic powder
DE3573039D1 (en) * 1984-04-28 1989-10-19 Toda Kogyo Corp Magnetic iron oxide particles
JPS6250889A (ja) * 1985-08-30 1987-03-05 ソニー株式会社 水平ブランキングパルス発生回路
DE3780903T2 (de) * 1986-10-17 1992-12-24 Toda Kogyo Corp Nadelfoermige magnetische eisenoxydteilchen, verfahren zu ihrer herstellung und solche teilchen verwendende magnetische aufzeichnungstraeger.
JPH01184801A (ja) * 1988-01-13 1989-07-24 Showa Denko Kk 磁気記録用磁性酸化鉄粉の製造法
JPH01257309A (ja) * 1988-04-07 1989-10-13 Tdk Corp 磁気記録媒体用磁性粉末とその製造方法
JP3015033B2 (ja) * 1988-07-20 2000-02-28 キヤノン株式会社 カラー画像処理方法
US5260132A (en) * 1988-10-31 1993-11-09 Hitachi Maxell, Ltd. Acicular alloy magnetic powder
DE3912976A1 (de) * 1989-04-20 1990-10-25 Basf Ag Nadelfoermige, kobaltmodifizierte eisenoxide und verfahren zu ihrer herstellung
US5188898A (en) * 1989-08-09 1993-02-23 Mitsui Toatsu Chemicals, Incorporated Ferromagnetic metal particles and preparation process thereof
JPH0425686A (ja) * 1990-05-21 1992-01-29 Nissan Motor Co Ltd 液圧制御弁装置
JP2925709B2 (ja) * 1990-10-31 1999-07-28 戸田工業株式会社 磁気記録用針状磁性酸化鉄粒子粉末の製造法
JPH06100317A (ja) * 1992-02-05 1994-04-12 Toda Kogyo Corp 磁性酸化鉄粒子粉末及びその製造法
JP3398404B2 (ja) * 1992-11-11 2003-04-21 戸田工業株式会社 磁気記録用磁性粒子粉末の製造法

Also Published As

Publication number Publication date
JPH07242425A (ja) 1995-09-19
US5626962A (en) 1997-05-06
DE69523495D1 (de) 2001-12-06
EP0671729A2 (de) 1995-09-13
EP0671729A3 (de) 1996-08-07
US5650194A (en) 1997-07-22
JP3389935B2 (ja) 2003-03-24
EP0671729B1 (de) 2001-10-31

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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