SURFACE PROTECTING MATERIAL

摘要

PURPOSE:A protecting material suitable as a solar cell having improved water- vapor resistance, obtained by forming a hot melt adhesive layer containing an ultraviolet light absorber and an antioxidant on the treated surface, obtained by subjecting the surface of FEP film to high-frequency sputtering etching treatment. CONSTITUTION:The surface of a tetrafluoroethylene-hexafluoropropylene copolymer film is subjected to high-frequency sputtering etching and a hot melt adhesive layer containing an ultraviolet light absorber and an antioxidant is formed on the treated surface. The sputtering etching on the film is carried out at 0.005-0.5Torr atmospheric pressure and the product of discharge powder and time is >=1W.sec/cm<2>. The hot melt adhesive comprises an ethylene-ethyl acrylate copolmer or an ethylene-vinyl acetaet copolymer as a main component and has 50-500mum layer thickness.