Abstract: Heat-sealable packaging film producing a peelable seal, process for the preparation thereof and packages made therefrom or comprising such a film. This film produces such a seal on a wide range of packaging films, including polyester, polyvinyl chloride, polyamide and polyacrylonitrile films owing to:1. its chemical composition which comprises:(a) 55 to 95% by weight of at least one ethylene polymer selected from polyethylene having a density of from 0.91 to 0.93 g/cm.sup.3 and an ethylene-vinyl acetate copolymer containing at most 10% by weight of vinyl acetate,(b) 5 to 30% by weight of polystyrene, and(c) 0 to 20% by weight of a thermoplastic, elastomeric styrene-butadiene-styrene or styrene-isoprene-styrene block copolymer, and2. the fact that that face of the film which is intended to form the peelable seal, has a surface tension of from 35 to 50, preferably of 37 to 45 millinewtons per meter. The film is prepared by extrusion followed by a corona discharge pretreatment of said face.

Abstract: A heat sealable packaging film particularly suitable for producing a peelable seal by heat sealing on polystyrene.For this purpose, the composition of the film comprises:(a) 50 to 70% by weight of at least one ethylene polymer having a melt index of 0.5 to 7 g/10 min and selected from polyethylene having a density of from 0.910 to 0.925 g/cm.sup.3 and an ethylene-vinyl acetate copolymer containing at most 7% by weight of vinyl acetate.(b) 20 to 30% by weight of at least one ethylene-vinyl acetate copolymer containing 20 to 30% by weight of vinyl acetate and having a melt index of 0.5 to 7 g/10 min, and(c) 10 to 20% by weight of a styrene homopolymer having a melt index of 0.5 to 7 g/10 min.Also provided are packages including a container made from polystyrene and a covering film for the said container, which is made from the aforesaid film, laminated or not on other films.