Impact resistant protective multilayer film
A clear multilayer film for coating synthetic environmental surfaces includes an exposed protective layer and an underlying cushioning layer. The exposed layer is primarily a polymer blend of a fluorine substituted olefin polymer, such as polyvinylidene fluoride, with an acrylic polymer. The cushioning layer is of a low modulus polymer selected from among impact modified acrylic polymer, ethylene vinyl acetate polymer and metallocene catalyzed polyethylene and having an elastic modulus below about 30,000 psi (207 MPa). The cushioning layer should be substantially free of all fluorinated polymers. The multilayer film can have an optional additional thermally adhesive layer of a blend of a fluorine substituted olefin polymer with an acrylic polymer. The multi layer film offers superior protection to such substrates as outdoor building siding, vehicle body panels, and signs from stains, weather conditions, and especially impact damage. Ally of the layers can also include fillers and additives adapted to provide a very low gloss appearance.
Saint-Gobain Performance Plastics Corporation
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Xixian Michael
Zhou Friedman