US4852646A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Thermally conductive gel materials
Assignee: Tyco International Ltd Bermuda
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Filing: 1987-06-16
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Granted: 1989-08-01
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Expires: 2007-06-16
Abstract
Abstract This invention provides new heat transfer materials comprising gels and particulate fillers and having a composite heat transfer coefficient greater than 2 watts/m-° K. and preferably greater than 15. The materials are easily conformable to irregularly shaped surfaces and have low TO-3 thermal impedance values, e.g., less than 0.5 at 300 psi mounting pressure.
Inventors
- 👤 Catherine A. Dittmer
- 👤 Robert S. Dubrow
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 22:47
CPC Classifications
C; C09; C09K; C09K5/00; C08; C08K; C08K3/00; C08K3/28; C08K3/01; C08K3/013
Claims Analysis
Total Claims: 34
Claim 1
Independent Claim
136 words
An assembly comprising: a first substrate and a second substrate; said first substrate being maintained by resistive heating at a higher temperature than said second substrate; said first substrate comprising an electrical component; and, placed between and in heat transferring contact with said first and second substrates an article comprising a flexible carrier supporting a thermally conductive cured composition comprising: (a) a gel material having a cone penetration value of about 50 to 350 (10 -1 mm) and an ultimate elongation of at least about 50%; and (b) dispersed in said gel material a particulate filler having a thermal conductivity of at least about 10 watts/m-°K.; wherein the filler is present in an amount between 5% and about 70% by weight of the composition; whereby heat is conducted from said first substrate to said second substrate.
Claim 2
Dependent Claim
136 words
An assembly comprising: a first substrate and a second substrate; said first substrate being maintained by resistive heating at a higher temperature than said second substrate; said first substrate comprising an electrical component; and, placed between and in heat transferring contact with said first and second substrates an article comprising a flexible carrier supporting a thermally conductive cured composition comprising: (a) a gel material having a cone penetration value of about 50 to 350 (10 -1 mm) and an ultimate elongation of at least about 50%; and (b) dispersed in said gel material a particulate filler having a thermal conductivity of at least about 10 watts/m-°K.; wherein the filler is present in an amount between 5% and about 70% by weight of the composition; whereby heat is conducted from said first substrate to said second substrate.
Claim 3
Dependent Claim
21 words
An assembly according to claim 1 wherein the particulate filler is present in an amount up to about 60% by weight.
Claim 4
Dependent Claim
20 words
An assembly according to claim 2 wherein the filler is present in an amount up to about 50% by weight.
Claim 5
Dependent Claim
13 words
An assembly according to claim 3 wherein the filler is a metal nitride.
Claim 6
Dependent Claim
12 words
An assembly according to claim 4 wherein the filler is aluminum nitride.
Claim 7
Dependent Claim
12 words
An assembly according to claim 1 wherein said filler is electrically insulative.
Claim 8
Dependent Claim
20 words
An assembly according to claim 1 wherein said layer is under a mounting pressure of up to about 300 psi.
Claim 9
Dependent Claim
18 words
An assembly according to claim 1 wherein said first substrate is a circuit board containing said electrical component.
Claim 10
Dependent Claim
14 words
An assembly according to claim 8 wherein said second substrate is a metal plate.
Claim 11
Dependent Claim
14 words
An assembly according to claim 8 wherein said second substrate is a cooling device.
Claim 12
Dependent Claim
13 words
An assembly according to claim 1 wherein said gel comprises a silicone composition.
Claim 13
Dependent Claim
21 words
An assembly according to claim 1 wherein said electrical component is selected from the group consisting of transistors, resistors and diodes.
Claim 14
Dependent Claim
76 words
An article comprising a flexible matrix impregnated with a cured composition comprising: (a) a gel material having a cone penetration value of about 50 to about 350 (10 1 mm) and an ultimate elongation of at least about 50%; and (b) dispersed in said gel material a particulate filler having a thermal conductivity of at least about 10 watts/m-°K.; wherein the filler is present in an amount between 5% and 70% by weight of the composition.
Claim 15
Dependent Claim
76 words
An article comprising a flexible matrix impregnated with a cured composition comprising: (a) a gel material having a cone penetration value of about 50 to about 350 (10 1 mm) and an ultimate elongation of at least about 50%; and (b) dispersed in said gel material a particulate filler having a thermal conductivity of at least about 10 watts/m-°K.; wherein the filler is present in an amount between 5% and 70% by weight of the composition.
Claim 16
Dependent Claim
14 words
An article according to claim 13 wherein the matrix material comprises a fibrous material.
Claim 17
Dependent Claim
15 words
An article according to claim 14 wherein the matrix material comprises a woven fibrous material.
Claim 18
Dependent Claim
15 words
An article according to claim 14 wherein the matrix material comprises a nonwoven fibrous material.
Claim 19
Independent Claim
140 words
A method of aiding in heat transfer comprising: placing on a first substrate from which or to which heat is to be conducted an article comprising a flexible carrier supporting a thermally conductive cured composition comprising: (a) a silicone gel material having a cone penetration value of about 50 to 350 (10 -1 mm) and an ultimate elongation of at least about 50%; and (b) dispersed in said gel material a particulate filler having a thermal conductivity of at least about 10 watts/-°K.; wherein the filler is present in an amount between 5% and about 70% by weight of the composition; applying to the exposed surface of said article a second substrate from which or to which heat is to be transferred; and applying a desired pressure to the article between the two substrates to obtain the desired heat transfer.
Claim 20
Independent Claim
140 words
A method of aiding in heat transfer comprising: placing on a first substrate from which or to which heat is to be conducted an article comprising a flexible carrier supporting a thermally conductive cured composition comprising: (a) a silicone gel material having a cone penetration value of about 50 to 350 (10 -1 mm) and an ultimate elongation of at least about 50%; and (b) dispersed in said gel material a particulate filler having a thermal conductivity of at least about 10 watts/-°K.; wherein the filler is present in an amount between 5% and about 70% by weight of the composition; applying to the exposed surface of said article a second substrate from which or to which heat is to be transferred; and applying a desired pressure to the article between the two substrates to obtain the desired heat transfer.
Claim 21
Independent Claim
141 words
A method of aiding in heat transfer comprising: placing on a first substrate from which or to which heat is to be conducted an article comprising a flexible matrix impregnated with a thermally conductive cured conductive composition comprising: (a) a gel material having a cone penetration value of about 50 to 350 (10 -1 mm) and an ultimate elongation of at least about 50%; and (b) dispersed in said gel material a particulate filler having a thermal conductivity of at least about 10 watts/m-°K.; wherein the filler is present in an amount between 5% and about 70% by weight of the composition; applying to the exposed surface of said article a second substrate from which or to which heat is to be transferred; and applying a desired pressure to the composition between the two substrates to obtain the desired heat transfer.
Claim 22
Independent Claim
141 words
A method of aiding in heat transfer comprising: placing on a first substrate from which or to which heat is to be conducted an article comprising a flexible matrix impregnated with a thermally conductive cured conductive composition comprising: (a) a gel material having a cone penetration value of about 50 to 350 (10 -1 mm) and an ultimate elongation of at least about 50%; and (b) dispersed in said gel material a particulate filler having a thermal conductivity of at least about 10 watts/m-°K.; wherein the filler is present in an amount between 5% and about 70% by weight of the composition; applying to the exposed surface of said article a second substrate from which or to which heat is to be transferred; and applying a desired pressure to the composition between the two substrates to obtain the desired heat transfer.
Claim 23
Dependent Claim
129 words
An assembly comprising: a first substrate, from which heat generated by resistive heating is to be conducted, and which comprises a transistor, a resistor or a diode; a second substrate to which heat is to conducted; and placed between and in heat transferring contact with said first and second substrates an article comprising a flexible carrier supporting a thermally conductive cured composition comprising: (a) a gel material having a cone penetration value of about 50 to 350 (10 -1 mm) and an ultimate elongation of at least about 50%; and (b) dispersed in said gel material an electrically insulative particulate filler having a thermal conductivity of at least about 10 watts/m-°K.; wherein the filler is present in an amount between 5% and about 70% by weight of the composition.
Claim 24
Dependent Claim
129 words
An assembly comprising: a first substrate, from which heat generated by resistive heating is to be conducted, and which comprises a transistor, a resistor or a diode; a second substrate to which heat is to conducted; and placed between and in heat transferring contact with said first and second substrates an article comprising a flexible carrier supporting a thermally conductive cured composition comprising: (a) a gel material having a cone penetration value of about 50 to 350 (10 -1 mm) and an ultimate elongation of at least about 50%; and (b) dispersed in said gel material an electrically insulative particulate filler having a thermal conductivity of at least about 10 watts/m-°K.; wherein the filler is present in an amount between 5% and about 70% by weight of the composition.
Claim 25
Dependent Claim
135 words
An assembly comprising: a first substrate comprising an electrical component, from which or to which heat is to be conducted and which is mounted on a circuit board; and, a second substrate to which or from which heat is to be conducted; and placed between and in heat transferring contact with said first and second substrates, an article comprising a flexible carrier supporting a thermally conductive cured composition comprising: (a) a gel material having a cone penetration value of about 50 to 350 (10 -1 mm) and an ultimate elongation of at least about 50%; and (b) dispersed in said gel material an electrically insulative particulate filler having a thermal conductivity of at least about 10 watts/m-°K.; wherein the filler is present in an amount between 5% and about 70% by weight of the composition.
Claim 26
Dependent Claim
135 words
An assembly comprising: a first substrate comprising an electrical component, from which or to which heat is to be conducted and which is mounted on a circuit board; and, a second substrate to which or from which heat is to be conducted; and placed between and in heat transferring contact with said first and second substrates, an article comprising a flexible carrier supporting a thermally conductive cured composition comprising: (a) a gel material having a cone penetration value of about 50 to 350 (10 -1 mm) and an ultimate elongation of at least about 50%; and (b) dispersed in said gel material an electrically insulative particulate filler having a thermal conductivity of at least about 10 watts/m-°K.; wherein the filler is present in an amount between 5% and about 70% by weight of the composition.
Claim 27
Dependent Claim
19 words
An assembly according to claim 20 wherein said filler has a thermal conductivity of at least about 100 watts/m-°K.
Claim 28
Dependent Claim
72 words
A thermally conductive cured composition comprising: (a) a gel material having a cone penetration value of about 50 to 350 (10 -1 mm) and an ultimate elongation of at least about 50%; and (b) dispersed in said gel material, an electrically insulative particulate filler having a thermal conductivity of at least about 100 watts/m-°K.; wherein the filler is present in an amount between 5% and about 70% by weight of the composition.
Claim 29
Dependent Claim
72 words
A thermally conductive cured composition comprising: (a) a gel material having a cone penetration value of about 50 to 350 (10 -1 mm) and an ultimate elongation of at least about 50%; and (b) dispersed in said gel material, an electrically insulative particulate filler having a thermal conductivity of at least about 100 watts/m-°K.; wherein the filler is present in an amount between 5% and about 70% by weight of the composition.
Claim 30
Dependent Claim
116 words
An article, for transferring heat from a first substrate to a second substrate, having a first surface and a second surface, both of said surfaces being adapted to be placed in heat transferring contact with said substrates, said article comprising a flexible carrier supporting an electrically insulating thermally conductive cured composition comprising: (a) a gel material having a cone penetration value of about 50 to 350 (10 -1 mm) and an ultimate elongation of at least about 50%; and (b) dispersed in said gel material a particulate filler having a thermal conductivity of at least about 10 watts/m-°K.; wherein the filler is present in an amount between 5% and about 70% by weight of the composition.
Claim 31
Dependent Claim
116 words
An article, for transferring heat from a first substrate to a second substrate, having a first surface and a second surface, both of said surfaces being adapted to be placed in heat transferring contact with said substrates, said article comprising a flexible carrier supporting an electrically insulating thermally conductive cured composition comprising: (a) a gel material having a cone penetration value of about 50 to 350 (10 -1 mm) and an ultimate elongation of at least about 50%; and (b) dispersed in said gel material a particulate filler having a thermal conductivity of at least about 10 watts/m-°K.; wherein the filler is present in an amount between 5% and about 70% by weight of the composition.
Claim 32
Dependent Claim
12 words
An article according to claim 23 in the form of a sheet.
Claim 33
Dependent Claim
25 words
An article according to claim 24 wherein said cured composition is present on at least a part of each of said first and second surfaces.
Claim 34
Dependent Claim
18 words
An article according to claim 23 wherein said carrier has an ultimate elongation of at least about 50%.
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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) | 1992-07-31 | 1993-01-30 | 1993-08-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-07-31 | 1997-01-30 | 1997-08-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-07-31 | 2001-01-30 | 2001-08-01 | $7700.00 | Window Closed / Lapsed |