TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Composition: The reactive functional group is carboxy radical, amide group, amino group, epoxy group, hydroxy group, acid anhydride group, isocyanate radical, sulfonic acid group, aziridine group, amine group, urea group, phosphate group, cyano group, cyanate group, imidazole group, oxazoline group and/or imine group. The multilayer film contains copolymer of monomer containing isobornyl (meth)acrylate and/or reactive functional group. The alkyl (meth)acrylate is methyl(meth)acrylate, ethyl (meth)acrylate, propyl (meth)acrylate, N-butyl (meth)acrylate, S-butyl (meth)acrylate, t-butyl (meth)acrylate, isobutyl (meth)acrylate, hexyl (meth)acrylate, 2-ethyl hexyl (meth)acrylate, N-octyl (meth)acrylate, isooctyl (meth)acrylate, N-nonyl (meth)acrylate, isononyl (meth)acrylate, N-decyl (meth)acrylate, isodecyl (meth)acrylate, N-dodecyl (meth)acrylate, N-tridecyl (meth)acrylate, and/or n-tetradecyl (meth)acrylate. The monomer containing reactive functional group is glycidyl (meth)acrylate, gylcidyl alkyl (meth)acrylate, (meth)acrylic acid, isocyanate alkyl(meth)acrylate, (meth)acrylonitrile, cyclohexylmaleimide, hydroxy alkyl (meth)acrylate, maleic anhydride, p-toluenesulfonic acid, phosphoric acid, (meth)acrylamide, aminoalkyl (meth)acrylate, vinyl imidazole and/or 2-isopropenyl-2-oxazoline. The solvent is acetone, methyl ethyl ketone, dimethylformamide, and/or dimethylacetamide.    TECHNOLOGY FOCUS - POLYMERS - Preferred Properties: The thickness of resin layer is 3-50 mu m. The fluorinated polymer has weight average molecular weight of 50000-1000000, and melting point of 80-175 degrees C. Preferred Layer: The resin layer is formed using a resin composition containing acryl polymer having functional group, fluorinated polymer, and solvent having boiling point of 200 degrees C or less. Preferred Composition: The fluorinated polymer is vinylidene fluoride, vinyl fluoride, tetrafluoroethylene, hexafluoropropylene, chlorotrifluoroethylene, trifluoroethylene, hexafluoroisobutylene, perfluorobutylethylene, perfluoromethylvinylether, perfluoroethyl vinyl ether, perfluoropropylvinylether, perfluoromethylvinylether, perfluoropropylvinylether, perfluoromethylvinylether, perfluoro-2,2-dimethyl-1,3-dioxole, and/or perfluoro-2-methylene-4-methyl-1,3-dioxolan. The content of comonomer in the multilayer film is 0.5-50 weight%. The content of acryl-type polymer containing reactive functional group is 50 weight% or less. The multilayer film further contains aluminum, iron, or polyethylene terephthalate, and is single sheet, laminated sheet or coextruded sheet containing polyethylene naphthalate or polybutylene terephthalate. The resin layer in multilayer film further comprises pigment, filler, ultraviolet stabilizer, thermal stabilizer or barrier particles.