FR2065359A5 - Polymeric coating on ferromagnetic particl - es to prevent oxidation - Google Patents

Polymeric coating on ferromagnetic particl - es to prevent oxidation

Info

Publication number
FR2065359A5
FR2065359A5 FR7036797A FR7036797A FR2065359A5 FR 2065359 A5 FR2065359 A5 FR 2065359A5 FR 7036797 A FR7036797 A FR 7036797A FR 7036797 A FR7036797 A FR 7036797A FR 2065359 A5 FR2065359 A5 FR 2065359A5
Authority
FR
France
Prior art keywords
particles
pref
monomer
coating
soln
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
Application number
FR7036797A
Other languages
French (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.)
AT&T Corp
Original Assignee
Western Electric Co Inc
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 Western Electric Co Inc filed Critical Western Electric Co Inc
Application granted granted Critical
Publication of FR2065359A5 publication Critical patent/FR2065359A5/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F1/00—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties
    • H01F1/01—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials
    • H01F1/03—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity
    • H01F1/032—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of hard-magnetic materials
    • H01F1/04—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of hard-magnetic materials metals or alloys
    • H01F1/06—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of hard-magnetic materials metals or alloys in the form of particles, e.g. powder
    • H01F1/061—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of hard-magnetic materials metals or alloys in the form of particles, e.g. powder with a protective layer

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Hard Magnetic Materials (AREA)
  • Paints Or Removers (AREA)

Abstract

The metallic particles are prepd. by (1) coating the particles (I) with a soln. of bi- or poly-functional monomers (II), (2) separating the coated particles from the soln. and polymerising the monomer. Pref. proportion of monomer/solvent is 1/15. Specif. (I) is gamma Fe2O3, (II) is tetraethylene glycol dimethacrylate or ethylene glycol diacrylate dispersed in mineral oil, silicone oil or chlorinated hydrocarbon, or divinyl benzene in ethylene glycol. Pref. after polymerisation of the monomer coating the particles are dispersed in a non-magnetic mouldable matrix, pref. a chlorobutadiene or polyetherurethane elastomer. The particles are used for magnetic tape, permanent magnets etc. Oxidation resistance of the particles is sufficient to allow long storage and usage life without deterioration.
FR7036797A 1969-10-13 1970-10-12 Polymeric coating on ferromagnetic particl - es to prevent oxidation Expired FR2065359A5 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US86573969A 1969-10-13 1969-10-13
US6214170A 1970-08-07 1970-08-07

Publications (1)

Publication Number Publication Date
FR2065359A5 true FR2065359A5 (en) 1971-07-23

Family

ID=26741919

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7036797A Expired FR2065359A5 (en) 1969-10-13 1970-10-12 Polymeric coating on ferromagnetic particl - es to prevent oxidation

Country Status (3)

Country Link
BE (1) BE757169A (en)
DE (1) DE2050225A1 (en)
FR (1) FR2065359A5 (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1989005032A1 (en) * 1987-11-25 1989-06-01 Eastman Kodak Company Epoxy bonded rare earth-iron-boron magnets and method of making same
WO1992020829A1 (en) * 1991-05-22 1992-11-26 Proengco Ab Magnetostrictive powder composite and methods for the manufacture thereof
DE19526712A1 (en) * 1995-07-24 1997-01-30 Schulman A Gmbh Polymer-based composition for the production of non-magnetic metal-containing moldings
US5792284A (en) * 1991-05-22 1998-08-11 Fox Technology Kb Magnetostrictive powder composite and methods for the manufacture thereof

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1989005032A1 (en) * 1987-11-25 1989-06-01 Eastman Kodak Company Epoxy bonded rare earth-iron-boron magnets and method of making same
WO1992020829A1 (en) * 1991-05-22 1992-11-26 Proengco Ab Magnetostrictive powder composite and methods for the manufacture thereof
US5792284A (en) * 1991-05-22 1998-08-11 Fox Technology Kb Magnetostrictive powder composite and methods for the manufacture thereof
DE19526712A1 (en) * 1995-07-24 1997-01-30 Schulman A Gmbh Polymer-based composition for the production of non-magnetic metal-containing moldings
DE19526712C2 (en) * 1995-07-24 2000-07-20 Schulman A Gmbh Polymer-based composition for the production of non-magnetic metal-containing moldings, process and use

Also Published As

Publication number Publication date
BE757169A (en) 1971-03-16
DE2050225A1 (en) 1971-06-24

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Legal Events

Date Code Title Description
ST Notification of lapse