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US 11,590,738 B2Granted
Multilayer films
AssigneePlantic Technologies Ltd.
InventorsNicholas John McCaffrey, Roya Khalil, Nicholas Roy Oakley, Brendan Morris
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Abstract
There is provided a multilayer film comprising a starch layer and at least one other layer. The multilayer film has excellent barrier properties. The starch layer comprises a modified starch having a degree of substitution less than 1.5. Suitable other layers include polyolefins. The multilayer film finds use in packaging, particularly in packaging foodstuffs.
Claims19
A multilayer film comprising:
- (a) at least one starch layer comprising a modified starch;
- and
- (b) at least one other layer having a water vapour permeability coefficient less than 1 g.mm/m2.24hr.atm measured at 38° C. and 90% relative humidity;
- and
- wherein the total thickness of the at least one starch layer is in the range of from about 50 to about 150 microns and is greater than 20% of the total thickness of the multilayer film, wherein the modified starch has a degree of substitution less than 1.5;
- wherein the multilayer film has an oxygen permeability coefficient (OPC) that remains below 0.2 cm3 mm/m2.24h.atm at 75% relative humidity for at least 10 days, wherein the OPC is normalised to 1 mm sample thickness and is based on starch layer thickness.
3 more elements
Dependencies are inferred from the claim text.