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A flexible composite material is disclosed which exhibits a controlled absorption of microwave energy based on presence of particulate carbon in a polymeric matrix bound to a porous substrate. The material is used in packages for microwave cooking. A process for making the material is also disclosed

A flexible composite material is disclosed which exhibits a controlled absorption of microwave energy based on presence of particulate carbon in a polymeric matrix bound to a porous substrate. The material is used in packages for microwave cooking. A process for making the material is also disclosed.

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A composite material for generation of heat by absorption of microwve energy comprising: (a) a porous, dielectric, substrate substantially transparent to microwave radiation; (b) an electrically conductive coating on one surface of the substrate comprising; (i) electrically conductive particles in (

A composite material for generation of heat by absorption of microwve energy comprising: (a) a porous, dielectric, substrate substantially transparent to microwave radiation; (b) an electrically conductive coating on one surface of the substrate comprising; (i) electrically conductive particles in (ii) a thermoplastic dielectric matrix, wherein, at least some of the matrix is beneath the surface of the substrate, is substantially free of electrically conductive particles, and is intermingled with the substrate; and (c) a protective layer of polyethylene terephthalate adhered to the electrically conductive coating. A process for manufacturing a composite material generation of heat by absorption of microwave energy comprising: (a) providing a porous, dielectric, substrate substantially transparent to microwave radiation; (b) applying to the substrate a coating of a dispersion of finely-divided, electrically conductive, particles in a thermoplastic dielectric matrix; (c) heating the coating and the substrate to a temperature above the softening point of the matrix; and (d) pressing the heated coating against the substrate at a pressure of 600 to 8700 kilopascals for 0.03 to 200 seconds.