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AssigneeENSO Oyj
InventorsJurkka Kuusipalo, Kimmo Nevalainen, Tapani Penttinen
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The invention relates to compostable polymer coated paper or paperboard (1), a method for making the same and products obtained therefrom. According to the invention, a compostable biodegradable coating (3) of paper or paperboard (1) includes an outer layer (6) containing polylactide the weight of which is at the most about 20 g/m2, and of an adhesive layer (7) that binds the outer layer to the paper or paperboard (1) and is of biodegradable polymer material that is coextruded with the polylactide. Suitable materials for the adhesive layer (7) are biodegradable polyesters. The production is by coextrusion of the polylactide layer (6) and the adhesive layer (7) on either one side of the paper or paperboard or on both sides thereof. Products obtained include in particular packages for food stuffs and disposable dishes such as containers for frozen foods, disposable drinking cups, heat-sealed carton packages and packaging wraps.
A compostable polymer coated paper or paperboard, wherein the coating comprises an outer layer containing polylactide having a weight of at most 20 g/m2, and an adhesive inner layer of biodegradable polymer material coextruded with the polylactide, the inner layer binding the outer layer to the paper or paperboard with an adhesive strength sufficient to prevent peeling off of the coating, wherein the outer layer and the adhesive inner layer have a combined total weight of at most 30 g/m2.
A compostable polymer coated paper or paperboard, wherein the coating comprises an outer layer containing polylactide having a weight of at most 20 g/m2, and an adhesive inner layer of biodegradable polymer material coextruded with the polylactide, the inner layer binding the outer layer to the paper or paperboard with an adhesive strength sufficient to prevent peeling off of the coating, wherein the adhesive layer contains biodegradable polyester amide, cellulose ester or aliphatic or aliphatic-aromatic copolyester.
Dependencies are inferred from the claim text.