Biodegradable paperboard laminate structure
AssigneeInternational Paper Company
InventorsCynthia L. Tanner, Charles E. Gibbons
Life of this patent
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Abstract
The present invention relates to a biodegradable paperboard-based package for various food products. The package utilizes a novel heat-sealable laminate structure wherein the exterior gloss heat-sealable layer is a degradable polymeric resin material such as a polyvinyl alcohol resin or a starch based low density polyethylene polymer resin. Utilization of the material in a novel fashion accelerates the paperboard substrate's degradative properties and tendencies.
Claims27
A biodegradable paperboard-based laminate structure for producing a degradable paperboard-based package comprising:
- a) a paperboard substrate having an interior side and an exterior side;
- b) at least one exterior layer of a low temperature extrusion coatable grade heat-sealable biodegradable polymer resin applied on said exterior side of said paperboard substrate;
- and
- c) an interior layer of a heat-sealable non-biodegradable polymer resin applied on said interior side of said paperboard substrate, which is heat-sealable with the exterior layer of a biodegradable polymer resin.
A biodegradable paperboard-based blank made from a biodegradable-based laminate comprising:
- a) a paperboard substrate having an interior side and an exterior side;
- b) at least one exterior layer of a low temperature extrusion coatable grade heat-sealable biodegradable polymer resin applied on said exterior side of said paperboard substrate;
- and
- c) an interior layer of a heat-sealable non-biodegradable polymer resin applied on said interior side of said paperboard substrate, which is heat-sealable with the exterior layer of a biodegradable polymer resin.
A biodegradable paperboard-based container made from a biodegradable-based laminate comprising:
- a) a paperboard substrate having an interior side and an exterior side;
- b) at least one exterior layer of a low temperature extrusion coatable grade heat-sealable biodegradable polymer resin applied on said exterior side of said paperboard substrate;
- and
- c) an interior layer of a heat-sealable non-biodegradable polymer resin applied on said interior side of said paperboard substrate, which is heat-sealable with the exterior layer of a biodegradable polymer resin.
Dependencies are inferred from the claim text.