Patent ID: 8197933

Claim:
A photovoltaic module backsheet comprising: a polyester film having opposite first and second surfaces, first and second fluoropolymer coatings on said first and second surfaces of said polyester film, respectively, said first and second fluoropolymer coatings each comprising fluoropolymer selected from homopolymers and copolymers of vinyl fluoride and homopolymers and copolymers of vinylidene fluoride polymer blended with compatible adhesive polymer comprising a backbone that is compatible with said fluoropolymer and pendant functional groups, said pendant functional groups selected from carboxylic acid, sulfonic acid, aziridine, anhydride, amine, isocyanate, melamine, epoxy, hydroxy and mixtures thereof; wherein said first and second surfaces of said polyester film comprise functional groups on each surface that interact with said pendant functional groups of the compatible adhesive polymer in said first and second fluoropolymer coatings to promote bonding of said first and second fluoropolymer coatings to said respective first and second surfaces of said polyester film, and wherein said first and second fluoropolymer coatings are first and second surface layers of the photovoltaic module backsheet.