Patent ID: 8506741

Claim:
A process for making a protective film comprising: a) providing a first carrier film having a length greater than 2 meters; b) coating the first carrier film with a dope comprising a soluble polyimide polymer and a solvent, wherein the soluble polyimide polymer is 6FDA-BDAF; c) curing the dope to form a base layer by evaporating the solvent such that the base layer has a base layer thickness less than 12 microns, and where the base layer has a length of at least 2 meters, an exterior surface, and an interior surface; d) coating the base layer exterior surface with an exterior layer where the exterior layer comprises a dielectric material; e) removing the first carrier film; f) connecting a second carrier film to the base layer exterior coated surface; g) coating the base layer interior surface with an interior layer, where the interior layer comprises a metallic layer, wherein the protective film comprises the base layer with the interior and exterior surfaces coated; and h) applying the protective film to a substrate such that the interior layer faces the substrate.