Packaging film
AssigneeNovamont S.p.A.
InventorsCatia Bastioli, Sebastià Gesti' Garcia
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Abstract
The present invention relates to a film comprising at least one biodegradable layer (i) having an elastic modulus of more than 450 MPa, consisting of a mixture of polyhydroxyalkanoate constituting the continuous phase and aliphatic and/or aliphatic-aromatic polyester constituting the discontinuous phase, and at least one coating layer (ii) preferably capable of having barrier effects against gases and liquids. The surface of said layer (i) will have a root mean square roughness Sq of more than 10 nm and less than 45 nm, measured by atomic force microscopy (AFM). The film is particularly suitable for use in food packaging.
Claims23
A barrier film comprising at least one biodegradable layer (i) having an elastic modulus higher than 450 MPa, consisting of a mixture comprising a polyhydroxyalkanoate constituting the continuous phase and an aliphatic and/or aliphatic-aromatic polyester constituting the discontinuous phase, the said mixture further comprising from 0.01 to 5% wt. of a crosslinking agent and/or a chain extending agent having two or multiple functional groups, and at least one coating layer (ii), where the surface of layer (i) is characterised by a root mean square roughness Sq of more than 20 nm and less than 45 nm, measured by atomic force microscopy (AFM).
Packaging having a barrier effect comprising a biodegradable film with a modulus of more than 450 MPa, consisting of a mixture comprising a polyhydroxyalkanoate as the continuous phase and at least one aliphatic and/or aliphatic-aromatic polyester as the discontinuous phase.
Dependencies are inferred from the claim text.