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US5091114A
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Conductive metal powders, process for preparation thereof and use thereof
Assignee: Asahi Kasei Corp
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Filing: 1989-08-18
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Granted: 1992-02-25
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Expires: 2009-08-18
Abstract
Abstract Conductive metal powders having high conductivity with minimized silver migration are characterized in that an average composition is represented by Ag x M 1-x (wherein M is at least one metal selected from Ni, Co, Cu and Fe; 0.01≦x≦0.4) and has a region wherein a silver concentration progressively increases on moving from the inner part toward the surface. The conductive metal powders, which are useful as leads, electrodes and shielding from electromagnetic interference are prepared by solidifying rapidly a molten metal having the specific composition.
Inventors
- 👤 Hitoshi Nakajima
- 👤 Akinori Yokoyama
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 03:05
CPC Classifications
B; B22; B22F; B22F9/00; B22F9/02; B22F9/14; H; H05; H05K; H05K9/00; H05K9/0073; H05K9/0081; H05K9/0083; B22F9/06; B22F9/08; B22F9/082; H01; H01B; H01B1/00; H01B1/02; H01H; H01H1/00; H01H1/02; H01H1/021; H01H1/023; B22F2998/00; B22F2999/00; H05K1/00; H05K1/02; H05K1/09; H05K1/092; H05K1/095; Y; Y10; Y10T; Y10T428/00; Y10T428/12; Y10T428/12181
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
50 words
Conductive metal powder having an average composition represented by Ag x M 1-x (wherein M is at least one metal selected from the group consisting of Ni, Co, Cu and Fe; 0.01≦x≦0.4) and component particles wherein silver concentration progressively increases from an inner part toward the surface of such particles.
Claim 2
Dependent Claim
50 words
Conductive metal powder having an average composition represented by Ag x M 1-x (wherein M is at least one metal selected from the group consisting of Ni, Co, Cu and Fe; 0.01≦x≦0.4) and component particles wherein silver concentration progressively increases from an inner part toward the surface of such particles.
Claim 3
Dependent Claim
29 words
Conductive metal powder of claim 1, wherein the silver concentration on the surface of component particles is at least 2.1 times the mean silver concentration of the component particles.
Claim 4
Dependent Claim
18 words
Conductive metal powder of claim 1 or 2, wherein said conductive metal powder consists essentially of spherical particles.
Claim 5
Dependent Claim
18 words
Conductive metal powder of claim 1 or 2, which has a mean particle diameter less than 100 μm.
Claim 6
Dependent Claim
19 words
Conductive metal powder of claim 1 or claim 2, wherein particles comprising the conductive metal powder are flaky particles.
Claim 7
Dependent Claim
30 words
Conductive metal powder of claim 5, wherein the flaky conductive metal particles have a mean diameter from 1 to 100 μm and a ratio of diameter/thickness of at least 3.
Claim 8
Dependent Claim
14 words
A conductive paste comprising conductive metal powder as claimed in claim 1 and binder.
Claim 9
Dependent Claim
13 words
A conductive paste of claim 7, wherein the binder is an organic binder.
Claim 10
Dependent Claim
18 words
A conductive paste of claim 7 or claim 8, wherein said conductive metal powder mainly comprises flaky particles.
Claim 11
Dependent Claim
16 words
A printing paste which is a conductive paste of one of the claims 7 and 8.
Claim 12
Dependent Claim
15 words
A conductive adhesive composition comprising a conductive paste of one of claims 7 and 8.
Claim 13
Dependent Claim
12 words
A shielding layer for electromagnetic interference comprising conductive paste of claim 8.
Claim 14
Dependent Claim
16 words
A lead for a printed circuit comprising conductive paste of one of claims 7 and 8.
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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) | 1995-02-24 | 1995-08-26 | 1996-02-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-02-24 | 1999-08-26 | 2000-02-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-02-24 | 2003-08-26 | 2004-02-25 | $7700.00 | Window Closed / Lapsed |