TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Components: The solvent comprises acetone, methyl ethyl ketone, dimethylformamide and dimethylacetamide.    TECHNOLOGY FOCUS - POLYMERS - Preferred Components: The fluoropolymer layer contains 0.1-10 pts. wt. of DOPO and includes 50-95 pts. wt. of fluoropolymer. The multi layer film satisfies a specific formula. The fluoropolymer includes comonomer vinylidene fluoride, tetrafluoroethylene, hexafluoropropylene, chlorotrifluoroethylene, trifluoroethylene, hexafluoroisobutylene, perfluorobutylethyene, perfluoromethylvinylether, perfluoroethyl vinyl ether, perfluoropropylvinylether, perfluorohexyl vinyl ether, perfluoro-2,2-dimethyl-1,3-dioxole and perfluoro-2-methylene-4- methyl-1,3-dioxolan. The comonomer contains 0.5-50 wt.% based on total weight of the fluoropolymer. The fluoropolymer has weight-average molecular weight of 5-100, melting point of 80-175 degrees C and thickness of 3-50 mu m. The fluoropolymer layer is amorphous resin that includes acrylic resin, polycarbonate, polyvinyl chloride, styrene-(meta) acrylonitrile copolymer, styrene-maleic anhydride copolymer, cycloolefin polymer, poly acrylonitrile, polystyrene, polysulfone, polyethersulfone or polyarylate. The fluoropolymer layer is a pigment that includes dispersant, filler, UV stabilizer, thermal stabilizer, antioxidant and an additive that includes barrier particles. The multi layer film further comprises a primer layer that is formed on an upper part of the fluoropolymer layer. The primer layer further comprises DOPO and a main chain skeleton that includes free radical addition polymer induced (meta) acryl group, urethane group, polyester group, aliphatic poly ester group, polyester urethane, ether sulfone group, ether imine group, amide group, meta acrylamide group, urea group, polycarbonate group, meta acrylic monomer, meta acrylamide based monomer, and vinyl monomer. The primer layer includes functional groups including carboxyl group, sulfonic acid group, aziridine group, anhydride group, amine group, isocyanate radical, cyanogen group and cyanuramide, epoxy group, hydroxy group, ester functional group, carbamate functional group, amide group, urea group, imide group, phosphate group, phosphate group, cyano group, cyanate group, imine group and oxazoline group. The primer layer has thickness of 10-5000 nm. The multi layer film further includes coextrusion materials that include aluminum, iron, polyethylene terephthalate, polyethylene naphthalate or polybutylene terephthalate. The surface of the coextrusion materials is treated with plasma, corona, primer, anchor, and coupling agents or through thermal process. The thickness of the coextrusion materials is 50-500 mu m. Preferred Process: The method additionally comprises drying the coating layer after the coating process. The drying process is performed at less than 200 degrees C for 30 second to 30 minutes and additionally performs plasma, corona, primer, anchor, coupling agent treatment process.