Abstract: A film for packaging foodstuffs utilizing a first outer layer of a cross-linked olefin polymer and a second inner layer adapted for lying adjacent foodstuff being packaged. The second inner layer is constructed of a material having a self sealing capability and which produces a moisture barrier without preventing the passage of free oxygen through the second layer.

Abstract: A novel process for manufacturing a container achieved by coextruding a middle tube of material having a low oxygen transmission rate between outer and inner tubes of olefin polymer to form a multilayered tubular unit. The outer tube is cross linked and the unit is biaxially oriented to a desired size. The inner tube is sealed to itself to complete formation of the container which includes an inner layer of olefin polymer, a middle layer of material having low oxygen permeability, and a relatively strong outer layer of cross linked olefin polymer.

Abstract: A multi-layer film having a crosslinked layer of an olefin vinyl alcohol copolymer is produced by providing a substrate layer and a layer of a copolymer of an olefin and a vinyl ester. The multi-layer structure is crosslinked preferably by irradiation and then hydrolyzed to convert the olefin/vinyl ester copolymer into a copolymer of the olefin and vinyl alcohol. The thus produced structure may be incorporated into a further film combination by extrusion coating additional layers. The multi-layer structure may be oriented to produce a heat shrinkable film for use as a packaging material.

Abstract: This invention is a process for making a self-welding packaging film by blending at least two ethylene polymers, one of the polymers having a melt flow substantially greater than any of the other polymers in the blend, and thereafter extruding a film from the blend. The film may be self-supporting or it may be an inner layer in a multi-ply film. Preferred ethylene polymers for the blend are the ethylene-vinyl acetate copolymers wherein one copolymer has a melt flow of less than 5.0 and the other has a melt flow greater than 28.0.

Abstract: This invention is a self-welding packaging film made by blending at least two ethylene polymers, one of the polymers having a melt flow substantially greater than any of the other polymers in the blend, and thereafter extruding a film from the blend. The film may be self-supporting or it may be an inner layer in a multi-ply film. Preferred ethylene polymers for the blend are the ethylene-vinyl acetate copolymers wherein one copolymer has a melt flow of less than 5.0 and the other has a melt flow greater than 28.0.