KR900009447A - 자기 기록용 자기 산화철 입자의 제조방법 - Google Patents

자기 기록용 자기 산화철 입자의 제조방법

Info

Publication number
KR900009447A
KR900009447A KR1019890017750A KR890017750A KR900009447A KR 900009447 A KR900009447 A KR 900009447A KR 1019890017750 A KR1019890017750 A KR 1019890017750A KR 890017750 A KR890017750 A KR 890017750A KR 900009447 A KR900009447 A KR 900009447A
Authority
KR
South Korea
Prior art keywords
manufacturing
iron oxide
oxide particles
magnetic
magnetic recording
Prior art date
Application number
KR1019890017750A
Other languages
English (en)
Other versions
KR0125939B1 (ko
Inventor
아라따 고야마
마꼬또 오가사와라
시게루 다까또리
Original Assignee
이시하라상교 가부시끼가이샤
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 JP63305051A external-priority patent/JPH02149428A/ja
Priority claimed from JP1075762A external-priority patent/JPH02255538A/ja
Application filed by 이시하라상교 가부시끼가이샤 filed Critical 이시하라상교 가부시끼가이샤
Publication of KR900009447A publication Critical patent/KR900009447A/ko
Application granted granted Critical
Publication of KR0125939B1 publication Critical patent/KR0125939B1/ko

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01G—COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSES C01D OR C01F
    • C01G49/00—Compounds 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
    • G11B5/70678—Ferrites
    • G11B5/70684—Ferro-ferrioxydes
    • 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
    • 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

Landscapes

  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Inorganic Chemistry (AREA)
  • Hard Magnetic Materials (AREA)
  • Compounds Of Iron (AREA)
KR1019890017750A 1988-12-01 1989-12-01 자기 기록용 자기 산화철 입자의 제조방법 KR0125939B1 (ko)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
JP63305051A JPH02149428A (ja) 1988-12-01 1988-12-01 磁気記録用強磁性酸化鉄粉末の製造方法
JP63-305051 1988-12-01
JP1075762A JPH02255538A (ja) 1989-03-28 1989-03-28 磁気記録用強磁性酸化鉄粉末の製造方法
JP1-75762 1989-03-28

Publications (2)

Publication Number Publication Date
KR900009447A true KR900009447A (ko) 1990-07-04
KR0125939B1 KR0125939B1 (ko) 1997-12-19

Family

ID=26416910

Family Applications (1)

Application Number Title Priority Date Filing Date
KR1019890017750A KR0125939B1 (ko) 1988-12-01 1989-12-01 자기 기록용 자기 산화철 입자의 제조방법

Country Status (4)

Country Link
US (1) US5041307A (ko)
EP (1) EP0371384B1 (ko)
KR (1) KR0125939B1 (ko)
DE (1) DE68923156T2 (ko)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
MY107614A (en) * 1990-09-26 1996-05-15 Ishihara Sangyo Kaisha Acicular ferromagnetic iron oxide particles and process for producing the same
DE4205634A1 (de) * 1992-02-25 1993-08-26 Bayer Ag Niederkoerzitive eisenoxidpigmente sowie verfahren zu deren herstellung
KR0163819B1 (ko) * 1994-08-05 1998-11-16 사코 유키오 마그네타이트 입자 및 그 제조방법

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1024642A (fr) * 1949-09-21 1953-04-03 Emi Ltd Procédé de fabrication de matériaux magnétisables
FR1063809A (fr) * 1952-04-18 1954-05-07 Emi Ltd Matériaux aimantables
DE2633597C2 (de) * 1976-07-27 1983-01-13 Bayer Ag, 5090 Leverkusen Verfahren zur Herstellung von nadel- bis prismenförmigen ferrimagnetischen Eisenoxidpigmenten zur magnetischen Signalaufzeichnung
JPS5387961A (en) * 1977-01-12 1978-08-02 Sony Corp Magnetic powder manufacturing process
JPS55149138A (en) * 1979-05-11 1980-11-20 Tdk Corp Iron oxide hydrate containing silicon and phosphorus, and its manufacture
JPH0732094B2 (ja) * 1984-04-02 1995-04-10 ソニー株式会社 針状強磁性酸化鉄磁性粉
JPS614202A (ja) * 1984-06-19 1986-01-10 Sony Corp 針状強磁性酸化鉄磁性粉の製法
FR2587990B1 (fr) * 1985-09-30 1987-11-13 Centre Nat Rech Scient Compositions d'oxydes magnetiques particulaires a structure de type spinelle lacunaire, leur preparation et leur application
EP0232131B1 (en) * 1986-01-29 1991-09-18 Toda Kogyo Corp. Plate-like barium ferrite particles suitable for use in magnetic recording and process for producing the same

Also Published As

Publication number Publication date
EP0371384B1 (en) 1995-06-21
DE68923156D1 (de) 1995-07-27
KR0125939B1 (ko) 1997-12-19
DE68923156T2 (de) 1995-12-07
EP0371384A2 (en) 1990-06-06
US5041307A (en) 1991-08-20
EP0371384A3 (en) 1991-04-17

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Legal Events

Date Code Title Description
A201 Request for examination
E701 Decision to grant or registration of patent right
GRNT Written decision to grant
FPAY Annual fee payment

Payment date: 20020822

Year of fee payment: 6

LAPS Lapse due to unpaid annual fee