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US 3,972,467 AGranted
Paper-board laminate
AssigneeInternational Paper Company
InventorsAllan A. Whillock, James Wesley Yount
Life of this patent
Estimating the term…
Abstract
An improved paperboard laminate for containers for bulk packaging liquids, syrups and pastes, which includes a layer of a high strength polymer film and which also may include a layer of aluminum foil.
Claims26
A laminate comprising:
- a layer of a paperboard base stock;
- a first layer of a thermoplastic material having a thickness of greater than about 0.0005 inches bonded to said layer of paperboard base stock;
- a layer of a polymer film having a thickness of between about 0.0003 inches and 0.0015 inches bonded to said layer of paperboard base stock, said polymer film having a tensile strength at the yield point greater than about 4000 p.s.i. and an elongation at fracture greater than about 200%;
- and
- a second layer of a thermoplastic material having a thickness of greater than about 0.0005 inches bonded to said layer of a polymer film.
2 more elements
In a thermoplastic-coated, paperboard container, suitable for liquids, pastes and syrups, an improved paperboard laminate material which comprises:
- a first layer of a thermoplastic material having a thickness of greater than about 0.0005 inches;
- a layer of a paperboard base stock, bonded to said first thermoplastic layer;
- a layer of a polymer film having a thickness of between about 0.0003 inches and 0.0015 inches bonded to said layer of a paperboard base stock, said polymer film having a tensile strength at the yield point greater than about 4000 p.s.i. and an elongation at fracture greater than about 200%;
- and
- a second layer of a thermoplastic material, having a thickness of greater than about 0.0005 inches bonded to said layer of a polymer film.
2 more elements
Dependencies are inferred from the claim text.