Multilayer film
AssigneeTristano Pty Ltd
InventorsChangping Chen, John Scheirs, Markus Leufgens
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Abstract
The invention relates to a multilayer film comprising at least a tri-layer structure, said tri-layer structure being made up of a core polymer layer interposed between two covering polymer layers that each comprise polyethylene, wherein the core polymer layer comprises a melt blend of polyethylene, thermoplastic starch, and ethylene acrylic acid copolymer.
Claims17
A multilayer film comprising at least a tri-layer structure, said tri-layer structure being made up of a core polymer layer interposed between two covering polymer layers that each comprise polyethylene, wherein the core polymer layer comprises a melt blend of:
- from about 5 wt % to about 85 wt % polyethylene comprising very low density polyethylene and low density polyethylene, from about 10 to about 80 wt % thermoplastic starch, from about 2 wt % to about 25 wt % ethylene acrylic acid copolymer and from about 0.2 wt % to about 2 wt % polyethylene wax;
- and wherein the core polymer layer further comprises ethylene vinyl acetate (EVA) copolymer.
A process for producing a multilayer film comprising at least a tri-layer structure, the process comprising forming the tri-layer structure by coextruding a core polymer layer interposed between two covering polymer layers that each comprise polyethylene, wherein the core layer comprises a melt blend of:
- from about 5 wt % to about 85 wt % polyethylene comprising very low density polyethylene and low density polyethylene, from about 10 wt % to about 80 wt % thermoplastic starch, from about 2 wt % to about 25 wt % ethylene acrylic acid copolymer, and from about 0.2 wt % to about 2 wt % polyethylene wax;
- and wherein the core polymer layer further comprises ethylene vinyl acetate (EVA) copolymer.
Dependencies are inferred from the claim text.