Patent ID: 7857930

Claim:
A method of making a flexible barrier film, comprising: co-extruding a heat sealable film; laminating a polyester layer to a first side of a vapor barrier film utilizing a first polyurethane adhesive to form a first laminated film, said vapor barrier film having a base polyester layer and an inorganic layer disposed on a first side of said base polyester layer, said laminating including laminating said polyester layer to said inorganic layer of said vapor barrier film; laminating a second side of a polyamide film to said heat sealable film utilizing a second polyurethane adhesive to form a second laminated film; and laminating said first laminated film and said second laminated film utilizing a third polyurethane adhesive to form the barrier film, said laminating including laminating a second side of said vapor barrier film to a first side of said polyamide film.