Use of an alloy of thermoplastic starch and TPE in the manufacture of an adhesive ultrathin waterproof-breathable film

An adhesive waterproof-breathable film comprising an alloy of thermoplastic starch and of hydrophilic thermoplastic elastomer (TPE), said hydrophilic TPE comprising at least 50% by weight of polyethylene glycol (PEG), with regard to total weight of said hydrophilic TPE;

• wherein said hydrophilic TPE comprises:
• a copolymer comprising polyurethane blocks and PEG blocks (TPUs);
• and
• at least one other hydrophilic TPE chosen from the group consisting of:
• copolymers comprising polyamide blocks and PEG blocks (PEBAs), wherein the molecular weight of the PEG block is between 200 and 6000 g/mol;
• copolymers comprising polyester blocks and PEG blocks (COPEs), wherein the molecular weight of the PEG block is between 200 and 6000 g/mol;
• and their blends;
• and
• wherein the adhesive waterproof-breathable film has a thickness within a range of 5 μm to 25 μm.