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US 9,067,388 B2Granted
Paperboard assembly with co extruded microlayered polymer barrier film
AssigneeWeyerhaeuser NR Company
InventorDwayne M. Shearer
Life of this patent
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Abstract
A co-extruded microlayered polymer barrier film is provided. The barrier film can be applied to paperboard to form a container having reduced oxygen gas permeability. Co-extrusion of the barrier film allows for the simultaneous fabrication of tens or hundreds of alternating microlayers of two different polymers that combine to form a film having reduced oxygen gas permeability compared to macro layer thickness films of the same two polymers.
Claims18
A paperboard assembly with oxygen barrier properties, comprising:
- a paperboard having a first side and a second side opposite the first side;
- and
- a composite barrier film adjacent the second side of the paperboard, the composite barrier film comprising:
- a first containment layer, disposed closest to the paperboard;
- a second containment layer, disposed farthest from the paperboard;
- and
- a microlayered composite layer intermediate the first containment layer and the second containment layer and comprising a plurality of unit layers, each unit layer comprising a layer of a first microlayer polymer and a layer of a second microlayer polymer, without a layer intermediate, wherein the first microlayer polymer is a polyolefin, and wherein the second microlayer polymer is selected from the group consisting of a polyamide, polypropylene, polyethylene terephthalate, and blends thereof.
4 more elements
Dependencies are inferred from the claim text.