DE3177172D1 - Verfahren zur herstellung nadelfoermiger eisenoxidteilchen. - Google Patents

Verfahren zur herstellung nadelfoermiger eisenoxidteilchen.

Info

Publication number
DE3177172D1
DE3177172D1 DE8181401165T DE3177172T DE3177172D1 DE 3177172 D1 DE3177172 D1 DE 3177172D1 DE 8181401165 T DE8181401165 T DE 8181401165T DE 3177172 T DE3177172 T DE 3177172T DE 3177172 D1 DE3177172 D1 DE 3177172D1
Authority
DE
Germany
Prior art keywords
iron oxide
oxide particles
shaped iron
producing needle
needle
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
DE8181401165T
Other languages
English (en)
Inventor
Bernard Jean Pingaud
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.)
Eastman Kodak Co
Original Assignee
Eastman Kodak Co
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
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=26221909&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=DE3177172(D1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Priority claimed from FR8016332A external-priority patent/FR2487326A1/fr
Application filed by Eastman Kodak Co filed Critical Eastman Kodak Co
Application granted granted Critical
Publication of DE3177172D1 publication Critical patent/DE3177172D1/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
    • 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
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
    • C01P2002/00—Crystal-structural characteristics
    • C01P2002/50—Solid solutions
    • C01P2002/52—Solid solutions containing elements as dopants
    • 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
    • C01P2004/10—Particle morphology extending in one dimension, e.g. needle-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
    • C01P2004/62—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
    • C01P2004/00—Particle morphology
    • C01P2004/80—Particles consisting of a mixture of two or more inorganic phases
    • C01P2004/82—Particles consisting of a mixture of two or more inorganic phases two phases having the same anion, e.g. both oxidic phases
    • C01P2004/84—Particles consisting of a mixture of two or more inorganic phases two phases having the same anion, e.g. both oxidic phases one phase coated with the other
    • 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

Landscapes

  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Inorganic Chemistry (AREA)
  • Compounds Of Iron (AREA)
  • Hard Magnetic Materials (AREA)
DE8181401165T 1980-07-24 1981-07-22 Verfahren zur herstellung nadelfoermiger eisenoxidteilchen. Expired - Fee Related DE3177172D1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8016332A FR2487326A1 (fr) 1980-07-24 1980-07-24 Procede de preparation de particules aciculaires d'oxyde de fer magnetique
US06/204,722 US4376714A (en) 1980-07-24 1980-11-06 Process for preparing acicular iron oxide particles

Publications (1)

Publication Number Publication Date
DE3177172D1 true DE3177172D1 (de) 1990-05-23

Family

ID=26221909

Family Applications (1)

Application Number Title Priority Date Filing Date
DE8181401165T Expired - Fee Related DE3177172D1 (de) 1980-07-24 1981-07-22 Verfahren zur herstellung nadelfoermiger eisenoxidteilchen.

Country Status (4)

Country Link
EP (1) EP0045246B1 (de)
JP (1) JPS57501026A (de)
DE (1) DE3177172D1 (de)
WO (1) WO1982000287A1 (de)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0191998A1 (de) * 1985-02-19 1986-08-27 Kodak-Pathe Verfahren zur Herstellung geschliffener, knotenförmiger Teilchen und solche Teilchen enthaltende isotrope magnetische Aufzeichnungsmedien
FR2637888B1 (fr) * 1988-10-18 1990-12-07 Kodak Pathe Procede de preparation de particules magnetiques d'hexaferrites, particules obtenues et produit les contenant
FR2685763B1 (fr) * 1991-12-27 1994-03-25 Aime Vareille Procede et dispositif optiques de mesure de distance et leur application au positionnement relatif de pieces.
JPH10226520A (ja) * 1997-02-10 1998-08-25 Titan Kogyo Kk 水和酸化鉄及び強磁性酸化鉄の製造方法

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2636892A (en) * 1948-04-23 1953-04-28 Int Standard Electric Corp Production of metal oxalates
DE801723C (de) * 1949-05-21 1951-01-22 Basf Ag Verfahren zur Herstellung magnetisierbarer Eisenoxyde
GB1328115A (en) * 1969-09-16 1973-08-30 Eastman Kodak Co Manufacture of goethite
US4255492A (en) * 1969-09-25 1981-03-10 Eastman Kodak Company Magnetic recording crystals, process for producing same, and magnetic recording webs using same
US3843773A (en) * 1970-05-11 1974-10-22 Eastman Kodak Co Process for producing fine acicular gamma ferric oxide crystals
GB1395704A (en) * 1971-04-27 1975-05-29 Eastman Kodak Co Magnetic materials
BE792847A (fr) * 1971-12-17 1973-06-15 Bayer Ag Procede de preparation d'oxydes de fer magnetiques aciculaires
US3928709A (en) * 1972-03-01 1975-12-23 Eastman Kodak Co Ferrous ferric oxides, process for preparing same and their use in magnetic recording
JPS519718B2 (de) * 1973-06-28 1976-03-29

Also Published As

Publication number Publication date
EP0045246A1 (de) 1982-02-03
WO1982000287A1 (en) 1982-02-04
EP0045246B1 (de) 1990-04-18
JPS57501026A (de) 1982-06-10

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Legal Events

Date Code Title Description
8363 Opposition against the patent
8339 Ceased/non-payment of the annual fee