US5286417A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and composition for making mechanical and electrical contact
Assignee: International Business Machines Corp
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Filing: 1991-12-06
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Granted: 1994-02-15
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Expires: 2011-12-06
Abstract
Abstract A fusible conductive adhesive for making electrical and mechanical contact is provided. The fusible conductive adhesive contains a polymer having a glass transition temperature and a thermal expansion co-efficient. The thermal expansion co-efficient of the polymer is in the range of about 5 parts per million per degree centigrade to about 10 parts per million per degree centigrade along a z-axis. The polymer is loaded with a conductive material having a sintering temperature range overlapping the glass transition temperature of the polymer. In addition, the loading of the conductive material in the polymer is in the range of about 15% to about 20% conductive material by weight based on the total weight of the polymer and the conductive material.
Inventors
- 👤 Issa S. Mahmoud
- 👤 Julian P. Partridge
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 22:57
CPC Classifications
H; H05; H05K; H05K3/00; H05K3/30; H05K3/32; H05K3/321; H05K3/323; H01; H01R; H01R4/00; H01R4/04; H05K2201/00; H05K2201/01; H05K2201/0104; H05K2201/0129; H05K2203/00; H05K2203/04; H05K2203/0425; H05K2203/11; H05K2203/1131; H10; H10W; H10W72/00; H10W72/30; H10W72/321; H10W72/325; H10W72/351; H10W72/352
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
130 words
A fusible conductive adhesive for making electrical and mechanical contact comprising: an polymer matrix having a glass transition temperature from about 150° C. to about 300° C. and a thermal expansion coefficient from about 5 ppm/C to about 10 ppm/C along a z-axis; a conductive material having a sintering temperature range of between about 100° C. to about 250° C., wherein at least a portion of the sintering temperature range of the conductive material overlaps the glass transition temperature of the polymer matrix, wherein the conductive metal is loaded in the polymer matrix in the range of about 15 percent to about 20 percent conductive material by weight based on the total weight of the polymer matrix and the conductive material, wherein the fusible conductive adhesive composition is anisotropically conductive.
Claim 2
Dependent Claim
130 words
A fusible conductive adhesive for making electrical and mechanical contact comprising: an polymer matrix having a glass transition temperature from about 150° C. to about 300° C. and a thermal expansion coefficient from about 5 ppm/C to about 10 ppm/C along a z-axis; a conductive material having a sintering temperature range of between about 100° C. to about 250° C., wherein at least a portion of the sintering temperature range of the conductive material overlaps the glass transition temperature of the polymer matrix, wherein the conductive metal is loaded in the polymer matrix in the range of about 15 percent to about 20 percent conductive material by weight based on the total weight of the polymer matrix and the conductive material, wherein the fusible conductive adhesive composition is anisotropically conductive.
Claim 3
Dependent Claim
15 words
The fusible conductive adhesive of claim 1, wherein the conductive material is a metal alloy.
Claim 4
Dependent Claim
21 words
The fusible conductive adhesive of claim 2, wherein the metal alloy is about 90 percent tin and about 10 percent gold.
Claim 5
Dependent Claim
21 words
The fusible conductive adhesive of claim 2, wherein the metal alloy is about 82 percent bismuth and about 18 percent gold.
Claim 6
Dependent Claim
114 words
A fusible conductive adhesive composition for making electrical and mechanical contact between two surfaces comprising: a conductive material having a sintering temperature range within a range of temperatures between about 100° C. to about 250° C.; a thermoplastic polymer having a thermal expansion coefficient in a range of about 5 parts per million per degree centigrade to about 10 parts per million per degree centigrade and a glass transition temperature between about 150° C. to about 250° C.; and a loading of the conductive material and the thermoplastic polymer in a range of about 15 percent to about 20 percent of conductive material by weight, wherein the fusible conductive adhesive composition is anisotropically conductive.
Claim 7
Dependent Claim
114 words
A fusible conductive adhesive composition for making electrical and mechanical contact between two surfaces comprising: a conductive material having a sintering temperature range within a range of temperatures between about 100° C. to about 250° C.; a thermoplastic polymer having a thermal expansion coefficient in a range of about 5 parts per million per degree centigrade to about 10 parts per million per degree centigrade and a glass transition temperature between about 150° C. to about 250° C.; and a loading of the conductive material and the thermoplastic polymer in a range of about 15 percent to about 20 percent of conductive material by weight, wherein the fusible conductive adhesive composition is anisotropically conductive.
Claim 8
Dependent Claim
25 words
The fusible conductive adhesive of claim 5, wherein the polymer is a thermoplastic polymer synthesized by reacting a pyromellitic dianhydride, an oxydianaline, and a hexafluorodianhydride.
Claim 9
Dependent Claim
15 words
The fusible conductive adhesive of claim 5, wherein the conductive material is a metal alloy.
Claim 10
Dependent Claim
21 words
The fusible conductive adhesive of claim 7, wherein the metal alloy is about 90 percent tin and about 10 percent gold.
Claim 11
Dependent Claim
21 words
The fusible conductive adhesive of claim 7, wherein the metal alloy is about 82 percent bismuth and about 18 percent gold.
Claim 12
Dependent Claim
132 words
A fusible conductive adhesive for making electrical and mechanical contact comprising: an polymer matrix synthesized by reaching a pyromellitic dianhydride, an oxydianaline, and a hexafluorodianhydride, wherein the polymer matrix has a glass transition temperature from about 200° C. to about 300° C. and a thermal expansion coefficient in range of about 5 ppm/C to about 10 ppm/C along a z-axis; a metal alloy having a sintering temperature range, the sintering temperature range of the metal alloy overlapping the glass transition temperature of the polymer matrix, wherein the conductive metal is loaded in the polymer matrix in the range of about 15 percent to about 20 percent conductive material by weight based on the total weight of the polymer matrix and the conductive material, wherein the fusible conductive adhesive composition is anisotropically conductive.
Claim 13
Dependent Claim
132 words
A fusible conductive adhesive for making electrical and mechanical contact comprising: an polymer matrix synthesized by reaching a pyromellitic dianhydride, an oxydianaline, and a hexafluorodianhydride, wherein the polymer matrix has a glass transition temperature from about 200° C. to about 300° C. and a thermal expansion coefficient in range of about 5 ppm/C to about 10 ppm/C along a z-axis; a metal alloy having a sintering temperature range, the sintering temperature range of the metal alloy overlapping the glass transition temperature of the polymer matrix, wherein the conductive metal is loaded in the polymer matrix in the range of about 15 percent to about 20 percent conductive material by weight based on the total weight of the polymer matrix and the conductive material, wherein the fusible conductive adhesive composition is anisotropically conductive.
Claim 14
Dependent Claim
21 words
The fusible conductive adhesive of claim 10, wherein the metal alloy is about 90 percent tin and about 10 percent gold.
Claim 15
Dependent Claim
21 words
The fusible conductive adhesive of claim 10, wherein the metal alloy is about 96 percent gold and about 4 percent silver.
Claim 16
Dependent Claim
21 words
The fusible conductive adhesive of claim 10, wherein the metal alloy is about 82 percent bismuth and about 18 percent gold.
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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) | 1997-02-14 | 1997-08-16 | 1998-02-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-02-14 | 2001-08-16 | 2002-02-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-02-14 | 2005-08-16 | 2006-02-15 | $7700.00 | Window Closed / Lapsed |