ELECTROTHERMAL HEATER MADE FROM THERMALLY CONDUCTING ELECTRICALLY INSULATING POLYMER MATERIAL
First Claim
1. A film formed from a blend of hexagonal boron nitride and a polymerizable monomer, wherein the hexagonal boron nitride is present in a concentration of from about 12 percent to about 40 percent weight, based on total weight of the film.
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Accused Products
Abstract
Thermally conductive films, composite materials including the films, and electrothermal heaters including the films, are disclosed. The films include a polymer and a sufficient concentration of hexagonal boron nitride to provide adequate heat transfer properties, and have high thermal conductivity, peel strength, and shear strength. The films can include thermoset polymers, thermoplastic polymers, or blends thereof, and can also include electrically conductive materials, reinforcing materials such as fiberglass, carbon fiber, metal mesh, and the like, and thermally conductive fillers, such as aluminum oxide, aluminum nitride, and the like. The films can be included in composite materials. The films can be used as part of a layered structure, and used in virtually any application, for example, various locations in aircraft, where heating is desirable, including nacelle skins, airplane wings, heated floor panels, and the like. The electrothermal heaters provide a more even heat, and a more rapid heat, than current resistive heaters formed from metal foils adhered to an adhesive film.
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Citations
20 Claims
- 1. A film formed from a blend of hexagonal boron nitride and a polymerizable monomer, wherein the hexagonal boron nitride is present in a concentration of from about 12 percent to about 40 percent weight, based on total weight of the film.
- 13. A composite material comprising a film and a thermally insulating layer, wherein the film is formed from a blend of hexagonal boron nitride and a polymerizable monomer, and wherein the hexagonal boron nitride is present in a concentration of from about 12 percent to about 40 percent weight, based on total weight of the film.
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16. A method for forming an thermally conductive film, comprising the steps of
blending hexagonal boron nitride and a polymerizable monomer wherein the hexagonal boron nitride is present in a concentration of between about 12 and about 40 percent weight; -
forming a layer of the resulting blend; and polymerizing the polymerizable monomer to form the thermally conductive film.
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17. A method for forming an thermally conductive film, comprising the steps of blending hexagonal boron nitride and a melted thennoplastic polymer wherein the hexagonal boron nitride is present in a concentration of from about 12 to about 40 percent weight, based on total weight of the film;
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forming a layer of the resulting blend; and cooling the melted polymer to form the thermally conductive film.
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18. A method of electrothermally heating an airplane component, comprising the steps of
providing a thermally conductive film to the airplane component, wherein the thermally conductive film comprises hexagonal boron nitride and a polymer; -
attaching at least one conductor to the thermally conductive film, wherein the conductor is further attached to a converter; and supplying electrical energy to the film via the converter and conductor so as to heat the airplane component. - View Dependent Claims (19, 20)
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Specification