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US5393445A Expired / Lapsed US ⏱️ 0.0 years remaining

Rare-earth bonded magnet, material and method for manufacturing the same

Assignee: Daido Steel Co Ltd
•
Filing: 1994-01-03
•
Granted: 1995-02-28
•
Expires: 2014-01-03
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Abstract

Abstract A material for a rare-earth bonded magnet is prepared by coating a rare-earth magnetic powder with a heat resisting addition polymerizable thermosetting resin consisting essentially of a monomer or polymer of 2,2-bis(cyanatophenyl) propane in an amount of not more than 2 wt % based on the weight of the magnetic powder. The oxidation of the rare-earth magnetic powder is thereby prevented or retarded by triazine rings formed in the coating film of the heat resisting addition polymerizable thermosetting resin. A rare-earth bonded magnet having improved heat resistance is prepared by agglomerating the coated rare-earth magnetic powder with a binder. The heat resistance of the bonded magnet is further improved by curing the heat resisting addition polymerizable thermosetting resin in a vacuum and by adding an organometallic salt as a metallic catalyst, to thereby improve the integrity of the coating film.

Inventors

  • 👤 Takashi Furuya
  • 👤 Naoki Hayashi

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-11-01 04:05
CPC Classifications
H; H01; H01F; H01F1/00; H01F1/01; H01F1/03; H01F1/032; H01F1/04; H01F1/047; H01F1/053; H01F1/055; H01F1/057; H01F1/0571; H01F1/0575; H01F1/0578; H01F1/0533; H01F1/0572; H01F1/059; Y; Y10; Y10S; Y10S428/00; Y10S428/90; Y10T; Y10T428/00; Y10T428/29; Y10T428/2982; Y10T428/2991; Y10T428/2998

Claims Analysis

Total Claims: 7
Claim 1
Independent Claim 49 words
A composition for a rare-earth bonded magnet comprising a rare-earth magnetic powder coated with a heat resisting addition polymerizable thermosetting material consisting essentially of a monomer or polymer of 2,2-bis(cyanatophenyl) propane in an amount of not more than 2 wt % based on the weight of the magnetic powder.
Claim 2
Dependent Claim 49 words
A composition for a rare-earth bonded magnet comprising a rare-earth magnetic powder coated with a heat resisting addition polymerizable thermosetting material consisting essentially of a monomer or polymer of 2,2-bis(cyanatophenyl) propane in an amount of not more than 2 wt % based on the weight of the magnetic powder.
Claim 3
Dependent Claim 35 words
The composition of claim 1, wherein the rare-earth magnetic powder is coated with the heat resisting addition polymerizable material in an amount of from 0.01-1.00 wt % based on the weight of the magnetic powder.
Claim 4
Dependent Claim 52 words
A rare-earth bonded magnet prepared by agglomerating a rare-earth magnetic powder coated with a heat resisting addition polymerizable thermosetting material consisting essentially of a monomer or polymer of 2,2-bis(cyanatophenyl) propane in an amount of not more than 2 wt % based on the weight of the magnetic powder together with a binder.
Claim 5
Dependent Claim 52 words
A rare-earth bonded magnet prepared by agglomerating a rare-earth magnetic powder coated with a heat resisting addition polymerizable thermosetting material consisting essentially of a monomer or polymer of 2,2-bis(cyanatophenyl) propane in an amount of not more than 2 wt % based on the weight of the magnetic powder together with a binder.
Claim 6
Dependent Claim 37 words
The rare-earth bonded magnet of claim 3, wherein the rare-earth magnetic powder is coated with the heat resisting addition polymerizable material in an amount of from 0.01-1.00 wt % based on the weight of the magnetic powder.
Claim 7
Dependent Claim 64 words
The rare-earth bonded magnet of claim 3, prepared by agglomerating a rare-earth magnetic powder coated with a heat resisting addition polymerizable thermosetting material consisting essentially of a monomer or polymer of 2,2-bis(cyanatophenyl) propane in an amount of not more than 2 wt % based on the weight of the magnetic powder together with a binder and a metallic catalyst comprising an organo metallic salt.

References Cited (Backward Citations)

US2904875A Cited
JPS6324607A Cited
US4973415A Cited
DE3803538A1 Cited
JPH01114006A Cited
JPH026573A Cited
US5176842A Cited
EP0549149A1 Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1998-02-27 1998-08-29 1999-02-28 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 2002-02-27 2002-08-29 2003-02-28 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 2006-02-27 2006-08-29 2007-02-28 $7700.00 Window Closed / Lapsed

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