Process for adjusting WVTR and other properties of a polyolefin film

A process for producing a film having a WVTR of at least 200 g/m2/day at 38° C. and 90% relative humidity comprising a polyolefin blend, said polyolefin blend having at least a first and a second polymer composition, and a filler, said process comprising:

• a) extruding a precursor film from said polyolefin blend comprising said first and said second polymer compositions and said filler, said filler concentration being in a range of from about 16.5 to about 71.5 wt. %, wherein,
• i) said first polymer composition is a polypropylene and
• ii) said second polymer composition is selected from the group consisting of elastomers, plastomers, styrenic block copolymers, ethylene-maleic anhydride copolymers, ethylene ethyl acetate, and combinations thereof, and
• b) passing said precursor film between at least one pair of interdigitating grooved rollers so that said film has at least
• i) a WVTR in a range of from about 200 g/m2/day to about 10,000 g/m2/day at 38° C. and 90% relative humidity,
• ii) a dart drop impact in a range of from about 100 grams to about 300 grams, and
• iii) an elongation selected from the group consisting of machine direction, transverse direction and combinations thereof in a range of from about 150% to about 550%.