NOVELTY - A fluoropolymer coated film comprises a polymeric substrate film; and a fluoropolymer coating on the polymeric substrate film. The polymeric substrate film comprises functional groups that interact with functional groups of vinyl fluoride copolymer to promote bonding of the fluoropolymer coating to the polymeric substrate film.    USE - The substrate film is used as a backsheet for a photovoltaic module (claimed).    ADVANTAGE - The crosslinked resin has good mechanical properties, e.g. high maximum stress and elongation at break values. The fluoropolymer coating film has a good quality coating results.    DETAILED DESCRIPTION - A fluoropolymer coated film comprises a polymeric substrate film; and a fluoropolymer coating on the polymeric substrate film. The fluoropolymer coating comprising a vinyl fluoride copolymer comprising 40-90 mol.% repeat units derived from vinyl fluoride and 10-60 mol.% repeat units derived from the monomer (a) and (b), provided that 0.1-50 mol.% repeat units in the copolymer are derived from monomer (b). Monomer (a) is tetrafluoroethylene, trifluoroethylene and/or chlorotrifluoroethylene. Monomer (b) is vinyl monomer containing at least one functional group from hydroxyls, thiols, carbonyls, carboxylic acids, carboxylic esters, acid anhydrides, sulfonyls, sulfonic acids, sulfonic esters, phosphoric acids, phosphoric esters, boric acids, boric esters, epoxies, isocyanates, thiocyanates, amines, amides, nitriles and halogen from bromide or iodide. The polymeric substrate film comprises functional groups that interact with the functional groups of the vinyl fluoride copolymer to promote bonding of the fluoropolymer coating to the polymeric substrate film. An INDEPENDENT CLAIM is included for a process for forming a fluoropolymer coated film comprising coating a polymeric substrate film with a liquid fluoropolymer coating composition comprising a liquid medium and dispersed or dissolved vinyl fluoride copolymer, and removing the liquid medium from the coating.