US3935340A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for preparing plastic coated metal powders
Assignee: Lion Fat and Oil Co Ltd
•
Filing: 1973-12-03
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Granted: 1976-01-27
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Expires: 1993-12-03
Abstract
Abstract Metal powder is suspended in an aqueous medium containing a radical-polymerizable monomer and polymerization is conducted in the presence of an acidic sulfite ion to produce a plastic coated metal powder which is effectively used for forming conductive plastics, molded articles for sintering, pressed powder magnetic cores and the like.
Inventors
- 👤 Tadashi Yamaguchi
- 👤 Takayuki Ono
- 👤 Hiroshi Hoshi
- 👤 Michio Hirakawa
- 👤 Isao Watanabe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 21:33
CPC Classifications
B; B22; B22F; B22F1/00; B22F1/10; B22F1/102; Y; Y10; Y10T; Y10T428/00; Y10T428/29; Y10T428/2982; Y10T428/2991; Y10T428/2998
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
44 words
A process for preparing plastic coated metal powder which comprises suspending a metal powder in an aqueous medium containing a radical-polymerizable monomer and initiating polymerization of said monomer with an initiator consisting essentially of acidic sulfite ions in the presence of said metal powder.
Claim 2
Dependent Claim
44 words
A process for preparing plastic coated metal powder which comprises suspending a metal powder in an aqueous medium containing a radical-polymerizable monomer and initiating polymerization of said monomer with an initiator consisting essentially of acidic sulfite ions in the presence of said metal powder.
Claim 3
Dependent Claim
26 words
A process according to claim 1 wherein said monomer is at least one member selected from the group consisting of methyl methacrylate, methyl acrylate and styrene.
Claim 4
Dependent Claim
42 words
A process according to claim 1 wherein at least one member selected from the group consisting of aqueous sulfurous acid, ammonium hydrogensulfite and sodium hydrogensulfite is added to said aqueous medium to generate the acidic sulfite ions present in said aqueous medium.
Claim 5
Dependent Claim
27 words
A process according to claim 1 wherein said acidic sulfite ion is present at a concentration, calculated as HSO 3 - , of 0.038 to 0.7 mole/l.
Claim 6
Dependent Claim
12 words
A process according to claim 1 wherein said aqueous medium is water.
Claim 7
Dependent Claim
13 words
The process of claim 1 wherein said monomer is an ethylenically unsaturated monomer.
Claim 8
Dependent Claim
23 words
The process of claim 6 wherein said monomer is present in an amount equal to about 0.05-100% by volume of said metal powder.
Claim 9
Dependent Claim
13 words
The process of claim 1 wherein said medium is agitated during said polymerization.
References Cited (Backward Citations)
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US3635752A
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Cited
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Cited
US3718594A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-01-26 | 1979-07-28 | 1980-01-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-01-26 | 1983-07-28 | 1984-01-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-01-26 | 1987-07-28 | 1988-01-27 | $7700.00 | Window Closed / Lapsed |