Multilayer paperboard packaging structure including polyolefin/polyamide blend layer
AssigneeInternational Paper Company
InventorsGregory J. Castle, Dolan R. Johnson, Keith S. Shih, A. Craig Bushman
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Abstract
A packaging laminate for a container which enables a blend monolayer to be effectively extrusion coated onto the paperboard substrate as the product contact layer without the need for tie layers or multilayer co-extrusion equipment. The blend monolayer has superior oxygen transmission resistance and has excellent pinhole resistance compared to straight polyethylene monolayer. The product contact layer consists of a blend of a polyolefin polymer, a polyamide, and a compatibilizer in a preferred embodiment. The monolayer blend is a low cost alternative to multilayer structures.
Claims17
A paperboard packaging laminate for a container comprising:
- a) a paperboard substrate;
- and
- b) a blend layer of a polyamide polymer and a polyethylene polymer coated onto said paperboard substrate, wherein the blend layer corresponds to a product contact layer when the laminate is formed into the container.
A paperboard packaging laminate for a container comprising:
- a) a paperboard substrate having a weight of approximately 265 lbs. per 3,000 square foot (approximately 432 grams per square meter);
- and
- b) a blend layer, comprising approximately 65% by weight of a low density polyethylene, approximately 30% by weight of a Nylon 6 and 5% by weight of a maleic anhydride functionalized compatibilizer, extrusion coated onto one side of the substrate as the product contact layer, and having a weight of approximately 25-30 lbs. per 3,000 square foot (approximately 41-49 grams per square meter).
A paperboard packaging laminate for a container comprising:
- a) a paperboard substrate;
- and
- b) a blend layer of a polyamide polymer and a polyethylene polymer coated onto said paperboard substrate, wherein the blend layer corresponds to an exterior layer when the laminate is formed into the container.
Dependencies are inferred from the claim text.