Patent ID: 8613822

Claim:
A method for reducing emissivity of a structure, the method comprising: providing a low emissivity composite film comprising: a film substrate; an underlayer of abrasion resistant hardcoat material deposited on the film substrate and comprising a crosslinked acrylate polymer and metal oxide nanoparticles, the underlayer having a dried thickness of about 2 to about 6 microns and an abrasion delta haze of about 3 to about 5%; at least one infrared reflective layer; a transparent protective top coat comprising a polysilazane, fluoro silane, fluoroalkyl silane, or combination thereof, having a thickness of less than about 0.5 microns, wherein the protective top coat is disposed over the infrared reflective layer; and an adhesive layer; wherein the composite film has an emissivity of less than about 0.30; wherein the underlayer is disposed between the film substrate and the infrared reflective layer; wherein the adhesive layer is disposed on the film substrate opposite the underlayer and infrared reflective layer; and attaching the adhesive layer to a surface forming at least a portion of a structure.