US4462919A
Expired / Lapsed
US
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Ferromagnetic resin composition containing polymeric surface precoated magnetic rare earth cobalt powders
Assignee: Sumitomo Bakelite Co Ltd
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Filing: 1983-12-09
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Granted: 1984-07-31
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Expires: 2003-12-09
Abstract
Abstract A ferromagnetic resin composition obtained by filling a thermoplastic resin with 70 to 97% by weight of rare earth-cobalt powder, the surface of which has been coated with a thermosetting resin or a thermoplastic resin. The composition gives a plastic magnet excellent in impact resistance.
Inventors
- 👤 Takehide Saito
- 👤 Yasuo Nakagawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 09:51
CPC Classifications
H; H01; H01F; H01F1/00; H01F1/01; H01F1/03; H01F1/032; H01F1/04; H01F1/047; H01F1/053; H01F1/055; H01F1/0555; H01F1/0558; Y; Y10; Y10T; Y10T428/00; Y10T428/25; Y10T428/254; Y10T428/29; Y10T428/2913; Y10T428/2973; Y10T428/2978; Y10T428/2982; Y10T428/2991; Y10T428/2998
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
51 words
A ferromagnetic resin composition consisting essentially of a thermoplastic resin filled with 70 to 97% by weight of magnetic rare earth-cobalt powder haing a particle size of 2 to 10μ, the surface of which has been pre-coated with 0.1 to 5% by weight of a thermosetting resin or a thermoplastic resin.
Claim 2
Dependent Claim
51 words
A ferromagnetic resin composition consisting essentially of a thermoplastic resin filled with 70 to 97% by weight of magnetic rare earth-cobalt powder haing a particle size of 2 to 10μ, the surface of which has been pre-coated with 0.1 to 5% by weight of a thermosetting resin or a thermoplastic resin.
Claim 3
Dependent Claim
55 words
A ferromagnetic resin composition according to claim 1, wherein the resin for the coating is a thermosetting resin selected from the group consisting of phenolic resins, epoxy resins, urea resins, melamine resins and urethane resins, or a thermoplastic resin selected from the group consisting of polyethylene, polypropylene, ethylene-vinyl acetate copolymer, ionomers, polybutene and polyamide resins.
Claim 4
Dependent Claim
40 words
A ferromagnetic resin composition according to claim 1, wherein the thermoplastic resin filled with the coated powder is selected from the group consisting of olefinic resins, polyamide resins, polycarbonate resins, modified PPO, polyacetals, PBT, polyacrylate resins, PPS, PS and PES.
Claim 5
Dependent Claim
40 words
A ferromagnetic resin composition according to claim 2, wherein the termoplastic resin filled with the coated powder is selected from the group consisting of olefinic resins, polyamide resins, polycarbonate resins, modified PPO, polyacetals, PBT, polyacrylate resins, PPS, PS and PES.
Claim 6
Dependent Claim
58 words
A ferromagnetic resin composition according to claim 1, wherein the rare earth-cobalt powder is of A-Co 5 or A 2 -Co 17 , wherein A is a rare earth element showing crystal magnetic anisotropy selected from the group consisting of yttrium, cerium, praseodymium, neodymium, samarium, gadolinium and misch metal which is a mixture of various rare earth metals.
Claim 7
Dependent Claim
58 words
A ferromagnetic resin composition according to claim 2, wherein the rare earth-cobalt powder is of A-Co 5 or A 2 -Co 17 , wherein A is a rare earth element showing crystal magnetic anisotropy selected from the group consisting of yttrium, cerium, praseodymium, neodymium, samarium, gadolinium and misch metal which is a mixture of various rare earth metals.
Claim 8
Dependent Claim
58 words
A ferromagnetic resin composition according to claim 3, wherein the rare earth-cobalt powder is of A-Co 5 or A 2 -Co 17 , wherein A is a rare earth element showing crystal magnetic anisotropy selected from the group consisting of yttrium, cerium, praseodymium, neodymium, samarium, gadolinium and misch metal which is a mixture of various rare earth metals.
Claim 9
Dependent Claim
57 words
A ferromagnetic resin composition according to claim 4, wherein the rare earth-cobalt powder is of A-Co 5 or A 2 -Co 17 , wherein A is rare earth element showing crystal magnetic anisotropy selected from the group consisting of yttrium, cerium, praseodymium, neodymium, samarium, gadolinium and misch metal which is a mixture of various rare earth metals.
Claim 10
Dependent Claim
32 words
A ferromagnetic resin composition according to claim 1, wherein said thermosetting resin or thermoplastic resin coated on the surface of said magnetic powder is present in an amount of 0.5-2% by weight.
Claim 11
Dependent Claim
32 words
A ferromagnetic resin composition according to claim 2, wherein said thermosetting resin or thermoplastic resin coated on the surface of said magnetic power is present in an amount of 0.5-2% by weight.
Claim 12
Dependent Claim
32 words
A ferromagnetic resin composition according to claim 5, wherein said thermosetting resin or thermoplastic resin coated on the surface of said magnetic powder is present in an amount of 0.5-2% by weight.
Claim 13
Dependent Claim
22 words
A ferromagnetic resin composition according to claim 1, wherein said magnetic powder is further coated with 0.1-2% by weight of an organosilane.
Claim 14
Dependent Claim
25 words
A ferromagnetic resin composition according to claim 12, wherein said organosilane is an epoxy silane, an amino silane, a vinyl silane or a chloro silane.
Claim 15
Dependent Claim
22 words
A ferromagnetic resin composition according to claim 5, wherein said magnetic powder is further coated with 0.1-2% by weight of an organosilane.
Claim 16
Dependent Claim
35 words
A composition according to claim 1 in the form of a molded magnet having a magnetic force in terms of (BH) max of 2-15 MGOe, wherein said composition has been molded in a magnetic field.
Claim 17
Dependent Claim
35 words
A composition according to claim 10 in the form of a molded magnet having a magnetic force in terms of (BH) max of 2-15 MGOe, wherein said composition has been molded in a magnetic field.
Claim 18
Dependent Claim
35 words
A composition according to claim 14 in the form of a molded magnet having a magnetic force in terms of (BH) max of 2-15 MGOe, wherein said composition has been molded in a magnetic field.
Claim 19
Dependent Claim
18 words
A ferromagnetic resin composition according to claim 1, wherein the resin for coating is applied as a solution.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-07-31 | 1988-01-30 | 1988-07-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-07-31 | 1992-01-30 | 1992-07-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-07-31 | 1996-01-30 | 1996-07-31 | $7700.00 | Window Closed / Lapsed |