Abstract: A back-sheet for a photovoltaic module is provided. A process for forming a back-sheet for a photovoltaic module includes the steps of providing a fluoropolymer film, providing a polymer melt comprising 20 to 95 weight percent ethylene propylene diene terpolymer, 5 to 70 weight percent of inorganic particulates, and 0 to 50 weight percent of adhesive selected from thermoplastic polymer adhesives and tackifiers, and depositing the polymer melt directly on the fluoropolymer film and pressing the fluoropolymer film and polymer melt together and cooling the polymer melt to form a first polymer layer adhered to the fluoropolymer film.

Abstract: A photovoltaic module is provided having an active solar cell layer having a front light receiving side and opposite rear side, with an encapsulant layer is adhered to the rear side of the active solar cell layer. The encapsulant layer comprises a first polymer film comprising 20 to 95 weight percent chlorosulfonated polyolefin such as chlorosulfonated polyethylene, and optionally an adhesive. The first polymer film of the encapsulant layer may further comprise 10 to 70 weight percent of inorganic particulates such as calcium carbonate, titanium dioxide, kaolin and clays. The first polymer film may be both a single layer encapsulant layer and back-sheet with an exposed surface.

Abstract: A photovoltaic module comprises an active solar cell layer having a front light receiving side and opposite rear side, an encapsulant layer adhered to the rear side of the active solar cell layer, and a back-sheet adhered to the encapsulant layer. The back-sheet comprises a first polymer film adhered to said encapsulant layer, where the first polymer film comprises 20 to 95 weight percent chlorosulfonated polyolefin, such as chlorosulfonated polyethylene, based on the weight of the first polymer film, and 1 to 35 weight percent of adhesive based on the weight of the first polymer film. The first polymer film may further comprise 10 to 70 weight percent of inorganic particulates such as calcium carbonate, titanium dioxide, kaolin and clays.