Stock material or miscellaneous articles – Structurally defined web or sheet – Including components having same physical characteristic in...
Reexamination Certificate
2001-08-01
2003-06-24
Nakarani, D. S. (Department: 1773)
Stock material or miscellaneous articles
Structurally defined web or sheet
Including components having same physical characteristic in...
C428S219000, C428S220000, C428S341000, C428S342000, C428S475800, C428S476100, C428S476300, C428S476900, C428S479300, C428S479600, C428S512000, C428S513000, C428S514000
Reexamination Certificate
active
06582808
ABSTRACT:
FIELD OF THE INVENTION
This invention relates to packaging cartons made from multilayer laminates containing paperboard and at least one layer of polymer blends of polyolefins and polyamides.
BACKGROUND OF THE INVENTION
The most recent improvement in the packaging structure for milk requires a multilayer coextrusion process onto a paperboard substrate as the product contact layer which includes Nylon 6/tie layer/low density polyethylene. This multilayer can be coextruded online and thereby produce a coated substrate. The multilayer coextrusion of Nylon 6/tie layer/low density polyethylene provides oxygen barrier, sealing, strength, and pinhole resistance though it can only be coextruded on very specific coextrusion apparatus.
There is a specific need to develop a barrier material that can be extruded on the product contact side of a paperboard package as a monolayer which has the performance of the multilayer. This approach will produce a lower cost structure verses the multilayer co-extrusion line economics.
SUMMARY OF THE INVENTION
According to the present invention, there is provided a polymer blend of a polyamide and a polyolefin, such as Nylon 6 and low density polyethylene, with other required or optional components, that is extruded as a monolayer on the product contact side of a paperboard packaging structure.
The structure improves pinhole resistance as well as oxygen barrier properties over the commercial monolayer structure and produces an improved structure with better bulge resistance via the monolayer extrusion coating process.
REFERENCES:
patent: 5175036 (1992-12-01), Smiley et al.
patent: 5403667 (1995-04-01), Simoens
patent: 5958534 (1999-09-01), Marbler et al.
Bushman A. Craig
Castle Gregory J.
Johnson Dolan R.
Shih Keith S.
Fletcher Melvin D.
Hoffman Wasson & Gitler
International Paper Company
Nakarani D. S.
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