Patent ID: 7862869

Claim:
A flexible multilayer packaging film comprising; (a) a first thermoplastic film layer, a second film layer, a third film layer, and a fourth thermoplastic film layer, wherein said first thermoplastic film layer comprises a first biaxially-oriented polymer and said first thermoplastic film layer has an internal surface and an opposing external surface, wherein said external surface of said first thermoplastic film layer comprises a surface-roughened portion on an external surface of said packaging film; (b) wherein said second film layer comprises an adhesive and is positioned between said first thermoplastic film layer and said third film layer; (c) wherein said third film layer comprises a barrier material and is positioned between said second film layer and said fourth thermoplastic film layer of said film, wherein said barrier material is selected from the group consisting of polyvinyl alcohol, ethylene vinyl alcohol copolymer, polyvinyl chloride, polyvinylidene chloride, polyvinylidene chloride/methyl acrylate copolymer, polyamide, high density polyethylene, metals, metal oxides, organometallic compounds, ceramics and mixtures thereof; (d) wherein said fourth thermoplastic film layer comprises a second biaxially-oriented polymer and said fourth thermoplastic film layer has an internal surface and an opposing external surface, wherein said external surface comprises at least one score-line and wherein said at least one score-line has a depth that terminates prior to reaching said barrier material of said third film layer thereby not adversely affecting barrier properties of said film; and (e) wherein said surface-roughened portion and said score-line intersect at least one axis drawn between both said first thermoplastic film layer and said fourth thermoplastic film layer wherein said at least one axis is perpendicular to the plane of said first thermoplastic film layer or said fourth thermoplastic film layer when said film is positioned in a lay flat condition.