Biodegradable film
AssigneeInnovia Films Limited
InventorsStephen Moore, Leo Frohlich, Paul Barker, Florian Chapalain, Lucy Cowton, Christopher Meek, Jonathan Hewitt
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Abstract
The present application concerns a coated film comprising a substantially biodegradable substrate having a biodegradable coating thereon at a coat weight of not more than 12 gsm, as well as useful articles sealed inside a package at least partly comprising such a film, and also a process for producing a coated film comprising providing a substantially biodegradable film substrate and applying a biodegradable coating to the substrate at a coat weight of less than 12 gsm by means of a hot melt coating step.
Claims34
A coated film having a thickness of less than 100 μm comprising a substantially biodegradable filmic substrate having a biodegradable coating thereon at a coat weight of not more than 12 gsm;
- wherein the coated film has a WVTR (Tropical, 38° C., 90% RH) of less than 20 gsm/day;
- and/or
- wherein the coated film is heat sealable, exhibiting a seal strength greater than 300 g/25 mm when sealed at 135° C. with a half second dwell time between sealing jaws, one of which is heated.
A process for producing a coated film comprising:
- providing a substantially biodegradable film substrate;
- and
- applying a biodegradable coating to the film substrate at a coat weight of less than 12 gsm by means of a hot melt coating step to provide a coated film having a thickness of less than 100 μm;
- and a WVTR (Tropical, 38° C., 90% RH) of less than 20 gsm/day;
- and/or is heat sealable, exhibiting a seal strength greater than 300 g/25 mm when sealed at 135° C. with a half second dwell time between sealing jaws, one of which is heated.
Dependencies are inferred from the claim text.