US Patent 8048938 Reflective film for thermal control

A reflective film includes a polymeric layer and a reflective component. The polymeric layer includes a polyimide polymer, where the polyimide polymer has a backbone with at least one non-terminal phenyl group. A linkage is connected to the non-terminal phenyl group, where the linkage can be an amide linkage or an ester linkage. An oligomeric silsesquioxane compound is connected to the linkage through an organic substituent, where the oligomeric silsesquioxane is not incorporated into the polymer backbone.