A thermally stable microporous breathable film is provided comprising at least
35% filler, by weight of the filled-film, and a thermoplastic polymer blend of
a first polyethylene polymer and a second polyethylene polymer. The first polyethylene
polymer comprises 30%-70% by weight of the polymer blend and can have a density
between about 0.86 g/cm3 and 0.89 g/cm3 and the second polyethylene
polymer can have a density between about 0.90 g/cm3 and 0.92 g/cm3.
The filled-film can be uniaxially or biaxially oriented to form a microporous film
and/or film laminate having good body conformance and which retains a high WVTR
at 37 C. and above.
