Thermally conductive sheet and associated methods
AssigneeLighting Science Group Corporation
InventorsCLYDE F. PARRISH, FREDRIC S. MAXIK, DAVID E. BARTINE
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Abstract
A thermally conductive sheet may include an electrically insulative bottom film, an electrically insulative top film, and an intermediate layer positioned between the bottom film and the top film. The intermediate layer may include a mixture of granulated thermally conductive material and granulated electrically insulating polymer. The granulated electrically insulating polymer is adapted to form a polyimide bridge between the bottom film and the top film.
Claims21
A thermally conductive sheet comprising:
- an electrically insulative bottom film;
- an electrically insulative top film;
- and
- an intermediate layer positioned between the bottom film and the top film;
- wherein the intermediate layer comprises a mixture of granulated thermally conductive material and granulated electrically insulating polymer;
- and
- wherein the granulated electrically insulating polymer is adapted to form a polyimide bridge between the bottom film and the top film.
A method of fabricating a thermally conductive sheet comprising the steps of:
- casting a bottom film of electrically insulating polymer;
- casting a top film of electrically insulating polymer;
- evaporating solvent from the bottom and top films to the point the bottom and top films are tacky;
- depositing a mixture of a granulated thermal conductor and a granulated electrically insulating polymer on a top surface of the bottom film;
- and
- placing the top film on the mixture, defining a sandwich structure.
A thermally conductive sheet comprising:
- an electrically insulative polyimide bottom film;
- an electrically insulative polyimide top film;
- and
- an intermediate layer positioned between the bottom film and the top film;
- wherein the intermediate layer comprises a mixture of granulated thermally conductive material and granulated electrically insulating polymer;
- wherein the granulated electrically insulating polymer is adapted to form a polyimide bridge between the bottom film and the top film;
- wherein each of the top and bottom films are formed from a substance that includes polyamic acid, the polyamic acid being formed by the step of reacting pyromellitic dianhydride with 1, 12-diaminododecane;
- wherein the top and bottom polyimide sheets are bonded together by at least one polyimide bridge;
- and
- wherein the mixture of granulated thermally conductive material and granulated electrically insulating polymer comprises from 1% to 3% granulated electrically insulative polymer.
Dependencies are inferred from the claim text.