A five layered thermoplastic film may be utilized to form storm windows or packaging material. A preferred embodiment of the film comprises a core layer consisting essentially of either (a) a copolymer of ethylene and vinyl acetate or (b) a three component blend of (a) a linear low density polyethylene,...http://www.google.es/patents/US4643943?utm_source=gb-gplus-sharePatente US4643943 - Multi-layer polyolefin shrink film
