US5098609A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Stable high solids, high thermal conductivity pastes
Assignee: Research Foundation of the State University of New York
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Filing: 1989-11-03
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Granted: 1992-03-24
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Expires: 2009-11-03
Abstract
Abstract A paste including a thermally conducting solid filler, a nonaqueous liquid carrier and a stabilizing dispersant. The pastes are highly concentrated, of low viscosity, electrically resistive, highly thermally conducting and stable. The pastes are easily applicable to electrical and electronic devices and may be removed therefrom with common solvents to access components where necessary.
Inventors
- 👤 Sushumna Iruvanti
- 👤 Rakesh K. Gupta
- 👤 Eli Ruckenstein
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 04:05
CPC Classifications
C; C09; C09K; C09K5/00; C09K5/08; H; H01; H01B; H01B1/00; H01B1/20; H01B1/22; H01B1/24; H10; H10W; H10W40/00; H10W40/20; H10W40/25; H10W40/254
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
134 words
A paste comprising a thermally conducting solid filler selected from the group consisting of Al, Cu, Ag, SiC, AlN, BN, Diamond, VB, VB 2 , Al 2 O 3 , ZnO, MgO, SiO 2 and mixtures thereof; a stabilizing dispersant selected from the group consisting of monomer fatty acid esters and salts thereof, oligomer fatty acid esters and salts thereof, polymer fatty acid esters and salts thereof, petroleum sulfonates, polyimides and polyesters; nonaqueous electrically resistive liquid carrier capable of forming a continuous phase with said dispersant; said paste containing between 5 and 40 volume percent liquid carrier; between 1 and 20 percent stabilizing dispersant based upon weight of solid filler; between 55 and 80 volume percent solids consisting of solid filler and dispersant; said paste being highly concentrated, stable, thermally conducting and electrically resistive.
Claim 2
Dependent Claim
134 words
A paste comprising a thermally conducting solid filler selected from the group consisting of Al, Cu, Ag, SiC, AlN, BN, Diamond, VB, VB 2 , Al 2 O 3 , ZnO, MgO, SiO 2 and mixtures thereof; a stabilizing dispersant selected from the group consisting of monomer fatty acid esters and salts thereof, oligomer fatty acid esters and salts thereof, polymer fatty acid esters and salts thereof, petroleum sulfonates, polyimides and polyesters; nonaqueous electrically resistive liquid carrier capable of forming a continuous phase with said dispersant; said paste containing between 5 and 40 volume percent liquid carrier; between 1 and 20 percent stabilizing dispersant based upon weight of solid filler; between 55 and 80 volume percent solids consisting of solid filler and dispersant; said paste being highly concentrated, stable, thermally conducting and electrically resistive.
Claim 3
Dependent Claim
20 words
The paste as recited in claim 1 wherein said paste is of a viscosity of 10 6 -10 3 poise.
Claim 4
Dependent Claim
21 words
The paste as recited in claim 1 wherein the thermal conductivity of the solid filler is at least about 1.0 Watt/mK.
Claim 5
Dependent Claim
21 words
The paste as recited in claim 1 wherein the thermal conductivity of the solid filler is at least about 30 Watt/mK.
Claim 6
Dependent Claim
15 words
The paste as recited in claim 1 wherein the solid filler is a metallic filler.
Claim 7
Dependent Claim
21 words
The paste as recited in claim 1 wherein the solid filler is of a particle size between about 0.05μ and 10μ.
Claim 8
Dependent Claim
20 words
The paste as recited in claim 1 wherein the paste comprises between about 60 to about 78 vol % solids.
Claim 9
Dependent Claim
23 words
The paste as recited in claim 1 wherein the paste comprises between about 5 to about 40 vol % of the liquid carrier.
Claim 10
Dependent Claim
14 words
The paste as recited in claim 1 wherein the paraffinic hydrocarbon is mineral oil.
Claim 11
Dependent Claim
21 words
The paste as recited in claim 1 wherein the monomer fatty acid ester is an ester of 12 hydroxy stearic acid.
Claim 12
Dependent Claim
39 words
The paste as recited in claim 1 wherein the paste has a viscosity of between about 10 3 to about 10 6 poise over a shear rate range of about 10 -3 to about 10 1 sec -1 .
Claim 13
Dependent Claim
20 words
The paste as recited in claim 1 wherein the paste has a thermal conductivity of greater than bout 1.0 Watt/mK.
Claim 14
Dependent Claim
20 words
The paste as recited in claim 1 wherein the paste has a thermal conductivity of greater than about 3 Watt/mK.
Claim 15
Dependent Claim
23 words
The paste as recited in claim 13 wherein the paste has a thermal conductivity of between about 3 Watt/mK to about 6 Watt/mK.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1995-03-24 | 1995-09-23 | 1996-03-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-03-24 | 1999-09-23 | 2000-03-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-03-24 | 2003-09-23 | 2004-03-24 | $7700.00 | Window Closed / Lapsed |