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US 4,852,646 AGranted
Thermally conductive gel materials
AssigneeRaychem Corporation
InventorsCatherine A. Dittmer, Robert S. Dubrow
Life of this patent
Estimating the term…
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-.degree. 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.
Claims26
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.sup.-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-.degree.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.
7 more elements
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.sup.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-.degree.K.;
- wherein the filler is present in an amount between 5% and 70% by weight of the composition.
1 more element
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.sup.-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/-.degree.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.
5 more elements
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.sup.-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-.degree.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.
5 more elements
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.sup.-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-.degree.K.;
- wherein the filler is present in an amount between 5% and about 70% by weight of the composition.
5 more elements
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.sup.-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-.degree.K.;
- wherein the filler is present in an amount between 5% and about 70% by weight of the composition.
6 more elements
A thermally conductive cured composition comprising:
- (a) a gel material having a cone penetration value of about 50 to 350 (10.sup.-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-.degree.K.;
- wherein the filler is present in an amount between 5% and about 70% by weight of the composition.
1 more element
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.sup.-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-.degree.K.;
- wherein the filler is present in an amount between 5% and about 70% by weight of the composition.
1 more element
Dependencies are inferred from the claim text.