Patent ID: 8771444

Claim:
A method for selectively reducing emissivity through a surface, the method comprising: providing a low emissivity composite film, comprising: a film substrate; an underlayer of abrasion resistant hardcoat material coated 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%; and at least one infrared reflective layer; a transparent protective top coat comprising a polysilazane, fluoro silane, fluoroalkyl silane, or combination thereof, wherein the protective top coat has a thickness of less than about 0.5 microns and is disposed over the infrared reflective layer; wherein the composite film has an emissivity of less than about 0.30; and wherein the underlayer is disposed between the film substrate and the infrared reflective layer; and selectively positioning the low emissivity composite film relative to a generally planar surface so that either; the low emissivity composite film is arranged in a first position generally coplanar with the surface to reduce emissivity through the surface; or the low emissivity composite film is arranged in a second position generally non-coplanar with the surface to not reduce emissivity through the surface.