Patent ID: 8835749

Claim:
A solar panel backside film, comprising: a) a polyethylene terephthalate film having, i) a molecular structure that results from a heat set temperature and duration to achieve a net peak area as measured by differential scanning calorimetry of about −15 J/g to about 5 J/g measured from the endpoint of its glass transition point up to 230° C., and ii) an additive dispersion to opacify the polyethylene terephthalate film and, b) a polymeric layer adhered to the polyethylene terephthalate film to create a solar panel backside film, wherein the solar panel backside film has a reflectivity of 50% or greater at a point in the visible range of light, and wherein the solar panel backside film, when applied to a solar panel and exposed to 2000 hours at 85° C. and 85% relative humidity, does not result in exfoliation or in the polyethylene terephthalate film.