Heat sealable packaging film comprising propylene polymer substrate and a surface layer blend of olefin copolymer or interpolymer

摘要

Multiple-layer, heat-sealable films are described comprising a substrate layer of polypropylene homopolymer or copolymer, or blends thereof with compatible polyolefins; and at least one heat-sealable surface layer of an interpolymer of propylene and two different higher alpha-olefins; a copolymer of butene-1 and a higher alpha-olefin or an interpolymer of ethylene, propylene and a higher olefin. The films are prepared by extrusion coating or coextrusion and can be oriented.