Recyclable transparent high strength composite antistatic film - has abrasion-resistant polymer cover, metal foil, antistatic polymer core and weldable backing with specified vol. resistivity

摘要

A composite transparent antistatic film has an abrasion-resistant polymer cover, an electrically conducting metallic layer beneath, a core of polymer under the metal, and a welded polymer base layer which contains antistatic medium is bonded to the core layer and forms the inner surface, in the assembly the surface resistivity of the outer surface is lower than that of the inner surface. The main core layer and the weldable base layer are both the same polymer, but the core only is a stretched polymer; both the core and the top cover contain antistatic agent; the volume resistivity of the composite is 10 power 9 - 10 power 14 ohm x cm. The main core layer and the weldable layer are pref. both polyethylene. In production, a film is heated, stretched, cooled and then brought together with the unstretched film; the two are then hot pressed together. The antistatic agents used in the system are e.g. quat. ammonium cpd. polyethylene glycols, monoethers, ethanolamine, glycerides, of certain fatty acids, and phosphoric acid ester soaps. ADVANTAGE - The prod. has a high mechanical strength, can be recycled, has a virtually antistatic content in the inner face. Ensures that any charges formed on the inner surface are discharged safely.