EP0468449A1
Expired / Lapsed
EP
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Bonded rare earth magnet and a process for manufacturing the same
Assignee: Kanegafuchi Chemical Industry Co Ltd
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Filing: 1991-07-23
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Granted: —
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Expires: 2011-07-23
Abstract
Abstract A highly rustproof resin-bonded magnet side by using a specific rustproofing resin for coating the particles of a magnetic powder, bonding them to form a molded body, or coating its surface, or for two or all of those purposes. The specific resin is selected from ones containing groups of atoms having a power of forming a coordinate bond and a reducing action. More specifically, it is (a) a high molecular compound produced by reacting with an epoxy resin one or more of a polyhydric phenol having adjacent hydroxyls, a polyhydric phenolic carboxylic acid having adjacent hydroxyls, an ester of a polyhydric phenol and a polyhydric alcohol having adjacent hydroxyls, and a polycyclic and polyhydric phenol having adjacent hydroxyls, (b) a redox resin as a reduction agent, or (c) a high molecular compound produced by curing a mixture of ascorbic acid, or a derivative thereof, and an epoxy resin.
Inventors
- 👤 Fumihito Mori
- 👤 Takuji Nomura
- 👤 Shogo Miki
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-03 00:09
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
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
86 words
A bonded rare earth magnet composed mainly of a powder of a magnetic material containing at least 50 atom % of iron, and a high molecular compound produced by reacting with an epoxy resin one or more of a polyhydric phenol having adjacent hydroxyls, a polyhydric phenolic carboxylic acid having adjacent hydroxyls, an ester of a polyhydric phenol and a polyhydric alcohol having adjacent hydroxyls, and a polycyclic and polyhydric phenol having adjacent hydroxyls, or composed mainly of said powder, said compound and another ordinary resin.
Claim 2
Dependent Claim
86 words
A bonded rare earth magnet composed mainly of a powder of a magnetic material containing at least 50 atom % of iron, and a high molecular compound produced by reacting with an epoxy resin one or more of a polyhydric phenol having adjacent hydroxyls, a polyhydric phenolic carboxylic acid having adjacent hydroxyls, an ester of a polyhydric phenol and a polyhydric alcohol having adjacent hydroxyls, and a polycyclic and polyhydric phenol having adjacent hydroxyls, or composed mainly of said powder, said compound and another ordinary resin.
Claim 3
Dependent Claim
25 words
A magnet as set forth in claim 1, wherein said powder is of Nd 2 Fe, 4 B, or another alloy further containing another element.
Claim 4
Dependent Claim
131 words
A process for manufacturing a bonded rare earth magnet comprising coating the particles of a powder of a magnetic material containing at least 50 atom % of iron with a high molecular compound produced by reacting with an epoxy resin one or more of a polyhydric phenol having adjacent hydroxyls, a polyhydric phenolic carboxylic acid having adjacent hydroxyls, an ester of a polyhydric phenol and a polyhydric alcohol having adjacent hydroxyls, and a polycyclic and polyhydric phenol having adjacent hydroxyls, or coating said particles with a mixture of said compound add another ordinary resin, or coating said particles with said compound and then with another ordinary resin to form a double resin coating on the surfaces of said particles; and molding said powder by using a synthetic resin as a binder.
Claim 5
Dependent Claim
131 words
A process for manufacturing a bonded rare earth magnet comprising coating the particles of a powder of a magnetic material containing at least 50 atom % of iron with a high molecular compound produced by reacting with an epoxy resin one or more of a polyhydric phenol having adjacent hydroxyls, a polyhydric phenolic carboxylic acid having adjacent hydroxyls, an ester of a polyhydric phenol and a polyhydric alcohol having adjacent hydroxyls, and a polycyclic and polyhydric phenol having adjacent hydroxyls, or coating said particles with a mixture of said compound add another ordinary resin, or coating said particles with said compound and then with another ordinary resin to form a double resin coating on the surfaces of said particles; and molding said powder by using a synthetic resin as a binder.
Claim 6
Dependent Claim
19 words
A process as set forth in claim 3, wherein said binder is said high molecular compound, or said mixture,
Claim 7
Dependent Claim
47 words
A process as set forth in claim 3 or 4, further including coating the surface of a molded product of said powder with said high molecular compound, or said mixture, or said high molecular compound and said ordinary resin forming a double resin coating on said surface.
Claim 8
Dependent Claim
25 words
A process as set forth in any of claims 3 to 5, wherein said powder is of Nd2Fe,4B, or another alloy further containing another element.
Claim 9
Dependent Claim
91 words
A process for manufacturing a bonded rare earth magnet comprising molding a powder of a magnetic material containing at least 50 atom % of iron by using as a binder a high molecular compound produced by reacting with an epoxy resin one or more of a polyhydric phenol having adjacent hydroxyls, a polyhydric phenolic carboxylic acid having adjacent hydroxyls, an ester of a polyhydric phenol and a polyhydric alcohol having adjacent hydroxyls, and a polycyclic and polyhydric phenol having adjacent hydroxyls, or a mixture of said compound and another ordinary resin.
Claim 10
Dependent Claim
91 words
A process for manufacturing a bonded rare earth magnet comprising molding a powder of a magnetic material containing at least 50 atom % of iron by using as a binder a high molecular compound produced by reacting with an epoxy resin one or more of a polyhydric phenol having adjacent hydroxyls, a polyhydric phenolic carboxylic acid having adjacent hydroxyls, an ester of a polyhydric phenol and a polyhydric alcohol having adjacent hydroxyls, and a polycyclic and polyhydric phenol having adjacent hydroxyls, or a mixture of said compound and another ordinary resin.
Claim 11
Dependent Claim
52 words
A process as set forth in claim 7, further including coating the surface of a molded product of said powder with said high molecular compound, or said mixture, or coating said surface with said high molecular compound and then with said ordinary resin to form a double resin coating on said surface.
Claim 12
Dependent Claim
27 words
A process as set forth in claim 7 or 8, wherein said powder is of Nd 2 Fe 14 B, or another alloy further containing another element.
Claim 13
Dependent Claim
132 words
A process for manufacturing a bonded rare earth magnet comprising forming a molded product of a powder of a magnetic material containing at least 50 atom % of iron by using an ordinary resin as a binder, and coating the surface of said product with a high molecular compound produced by reacting with an epoxy resin one or more of a polyhydric phenol having adjacent hydroxyls, a polyhydric phenolic carboxylic acid having adjacent hydroxyls, an ester of a polyhydric phenol and a polyhydric alcohol having adjacent hydroxyls, and a polycyclic and polyhydric phenol having adjacent hydroxyls, or coating said surface with a mixture of said compound and another ordinary resin, or coating said surface with said compound and then with another ordinary resin to form a double resin coating on said surface.
Claim 14
Dependent Claim
132 words
A process for manufacturing a bonded rare earth magnet comprising forming a molded product of a powder of a magnetic material containing at least 50 atom % of iron by using an ordinary resin as a binder, and coating the surface of said product with a high molecular compound produced by reacting with an epoxy resin one or more of a polyhydric phenol having adjacent hydroxyls, a polyhydric phenolic carboxylic acid having adjacent hydroxyls, an ester of a polyhydric phenol and a polyhydric alcohol having adjacent hydroxyls, and a polycyclic and polyhydric phenol having adjacent hydroxyls, or coating said surface with a mixture of said compound and another ordinary resin, or coating said surface with said compound and then with another ordinary resin to form a double resin coating on said surface.
Claim 15
Dependent Claim
21 words
A process as set forth in claim 10, wherein said powder is of Nd2Fe,4B, or another alloy further containing another element.
Claim 16
Dependent Claim
34 words
A bonded rare earth magnet made by molding a powder of a magnetic material containing at least 50 atom % of iron by using a redox resin as a reduction agent as a binder.
Claim 17
Dependent Claim
34 words
A bonded rare earth magnet made by molding a powder of a magnetic material containing at least 50 atom % of iron by using a redox resin as a reduction agent as a binder.
Claim 18
Dependent Claim
47 words
A bonded rare earth magnet made by molding a powder of a magnetic material containing at least 50 atom % of iron by using as a binder a high molecular compound produced by curing a mixture of ascorbic acid, or a derivative thereof, and on epoxy resin.
Claim 19
Dependent Claim
47 words
A bonded rare earth magnet made by molding a powder of a magnetic material containing at least 50 atom % of iron by using as a binder a high molecular compound produced by curing a mixture of ascorbic acid, or a derivative thereof, and on epoxy resin.
Claim 20
Dependent Claim
23 words
A magnet as set forth in claim 12 or 13, wherein said powder is of Nd2Fe,4B, or another alloy further containing another element.
References Cited (Backward Citations)
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