Patent ID: 7732355

Claim:
A water-vapor permeable film comprising: 90-99 wt % thermoplastic polyurethane (TPU) comprising hard segment and soft segment with a ratio of about 0.5-0.8 there between, and 1-10 wt % high density polyethylene (HDPE) of density of about 0.941-0.970 g/cm 3 ; wherein the hard segment of the thermoplastic polyurethane (TPU) comprises aromatic polyisocyanate comprising 4,4-methylene bisphenyl diisocyanate (MDI) or toluene diisocyanate (TDI) and the soft segment of the thermoplastic polyurethane (TPU) comprises polyether-polyol comprising polyethylene glycol (PEG), polypropylene glycol (PPG), or polytetramethylene glycol (PTMG).