FR2449710A1 - Procede pour la preparation d'un pigment magnetique de particules de g-fe2o3 et element d'enregistrement magnetique comportant un tel pigment - Google Patents

Procede pour la preparation d'un pigment magnetique de particules de g-fe2o3 et element d'enregistrement magnetique comportant un tel pigment

Info

Publication number
FR2449710A1
FR2449710A1 FR8003691A FR8003691A FR2449710A1 FR 2449710 A1 FR2449710 A1 FR 2449710A1 FR 8003691 A FR8003691 A FR 8003691A FR 8003691 A FR8003691 A FR 8003691A FR 2449710 A1 FR2449710 A1 FR 2449710A1
Authority
FR
France
Prior art keywords
pigment
ammonium salt
magnetic
recording element
magnetic recording
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
FR8003691A
Other languages
English (en)
Other versions
FR2449710B1 (fr
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.)
Koninklijke Philips NV
Original Assignee
Philips Gloeilampenfabrieken NV
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 Philips Gloeilampenfabrieken NV filed Critical Philips Gloeilampenfabrieken NV
Publication of FR2449710A1 publication Critical patent/FR2449710A1/fr
Application granted granted Critical
Publication of FR2449710B1 publication Critical patent/FR2449710B1/fr
Granted legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09C—TREATMENT OF INORGANIC MATERIALS, OTHER THAN FIBROUS FILLERS, TO ENHANCE THEIR PIGMENTING OR FILLING PROPERTIES ; PREPARATION OF CARBON BLACK  ; PREPARATION OF INORGANIC MATERIALS WHICH ARE NO SINGLE CHEMICAL COMPOUNDS AND WHICH ARE MAINLY USED AS PIGMENTS OR FILLERS
    • C09C1/00—Treatment of specific inorganic materials other than fibrous fillers; Preparation of carbon black
    • C09C1/22—Compounds of iron
    • C09C1/24—Oxides 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
    • G11B5/70652—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
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
    • C01P2004/00—Particle morphology
    • C01P2004/50—Agglomerated particles
    • 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
    • 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
    • Y10T428/31504—Composite [nonstructural laminate]
    • Y10T428/31678—Of metal

Landscapes

  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Paints Or Removers (AREA)
  • Pigments, Carbon Blacks, Or Wood Stains (AREA)
  • Hard Magnetic Materials (AREA)
  • Manufacturing Of Magnetic Record Carriers (AREA)
  • Magnetic Record Carriers (AREA)

Abstract

ON PART D'UNE DISPERSION AQUEUSE DE G-FEO ET AJOUTE A LA DISPERSION AQUEUSE UN SEL D'AMMONIUM SOLUBLE DANS L'EAU, DERIVE D'UN ACIDE ORGANIQUE FAIBLE A POIDS MOLECULAIRE BAS. LES PARTICULES DE G-FEO FLOCULENT ET SONT SEPAREES, LAVEES AVEC DE L'EAU, DE PREFERENCE EGALEMENT MUNIE D'UN SEL D'AMMONIUM ET ENSUITE SECHEES. LE SEL D'AMMONIUM SE VOLATILISE AU COURS DU PROCESSUS DE SECHAGE, SOIT COMME TEL, SOIT APRES DECOMPOSITION. UN SEL D'AMMONIUM APPROPRIE EST L'ACETATE D'AMMONIUM. LE PIGMENT OBTENU PRESENTE UNE FAIBLE TENEUR DE SEL ABSORBE A LA SURFACE DU PIGMENT. UN ELEMENT D'ENREGISTREMENT MAGNETIQUE BASE SUR LE PIGMENT PRESENTE UN COMPORTEMENT D'ENDURANCE, AMELIORE SURTOUT DANS LE CAS D'EMMAGASINAGE OU UTILISATION DANS DES CONDITIONS HUMIDES. APPLICATION: BANDES MAGNETIQUES.
FR8003691A 1979-02-23 1980-02-20 Procede pour la preparation d'un pigment magnetique de particules de g-fe2o3 et element d'enregistrement magnetique comportant un tel pigment Granted FR2449710A1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL7901437A NL7901437A (nl) 1979-02-23 1979-02-23 Werkwijze voor de bereiding van een magnetisch pigment van gamma-fe2o3 deeltjes.

Publications (2)

Publication Number Publication Date
FR2449710A1 true FR2449710A1 (fr) 1980-09-19
FR2449710B1 FR2449710B1 (fr) 1983-09-02

Family

ID=19832680

Family Applications (1)

Application Number Title Priority Date Filing Date
FR8003691A Granted FR2449710A1 (fr) 1979-02-23 1980-02-20 Procede pour la preparation d'un pigment magnetique de particules de g-fe2o3 et element d'enregistrement magnetique comportant un tel pigment

Country Status (6)

Country Link
US (1) US4425409A (fr)
JP (1) JPS55116760A (fr)
DE (1) DE3004081A1 (fr)
FR (1) FR2449710A1 (fr)
GB (1) GB2045220B (fr)
NL (1) NL7901437A (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2842436B1 (fr) * 2002-07-17 2005-05-06 Omya Sa Procede de preparation de suspensions aqueuses de charges minerales. suspensions aqueuses de charges minerales obtenues et leurs utilisations
JP4882406B2 (ja) * 2005-09-22 2012-02-22 Ｊｆｅスチール株式会社 連続鋳造機用クーリンググリッド設備及び連続鋳造鋳片の製造方法

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DD74306A (fr) *
JPS4915360A (fr) * 1972-05-17 1974-02-09
FR2209989A1 (fr) * 1972-07-26 1974-07-05 Khalafalla Sanaa
FR2274562A1 (fr) * 1974-06-14 1976-01-09 Basf Ag Procede de preparation d'oxyde de fer g-(iii)
JPS5120595A (fr) * 1974-08-11 1976-02-18 Hitachi Maxell
JPS54138894A (en) * 1978-04-20 1979-10-27 Hitachi Maxell Ltd Production of magnetic iron oxide powder

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4827118B1 (fr) * 1969-11-04 1973-08-18
US4054643A (en) 1976-05-03 1977-10-18 Suntech, Inc. Manufacture of γ-Fe2 O3

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DD74306A (fr) *
JPS4915360A (fr) * 1972-05-17 1974-02-09
FR2209989A1 (fr) * 1972-07-26 1974-07-05 Khalafalla Sanaa
FR2274562A1 (fr) * 1974-06-14 1976-01-09 Basf Ag Procede de preparation d'oxyde de fer g-(iii)
JPS5120595A (fr) * 1974-08-11 1976-02-18 Hitachi Maxell
JPS54138894A (en) * 1978-04-20 1979-10-27 Hitachi Maxell Ltd Production of magnetic iron oxide powder

Non-Patent Citations (3)

* Cited by examiner, † Cited by third party
Title
CA1975 *
CA1976 *
CA1980 *

Also Published As

Publication number Publication date
DE3004081A1 (de) 1980-09-04
GB2045220B (en) 1983-05-11
FR2449710B1 (fr) 1983-09-02
DE3004081C2 (fr) 1990-09-06
GB2045220A (en) 1980-10-29
NL7901437A (nl) 1980-08-26
US4425409A (en) 1984-01-10
JPH0234989B2 (fr) 1990-08-07
JPS55116760A (en) 1980-09-08

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Legal Events

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