Polyolefin film for use in packaging

A drawn film comprising a thermoplastic composition, wherein the composition contains a continuous phase that includes a polyolefin matrix polymer and a polymeric nanoinclusion additive comprising a functionalized polyolefin and a polymeric microinclusion additive dispersed within the continuous phase in the form of discrete domains,

• wherein the polymeric nanoinclusion additive is in the form of nanoscale domains and the polymeric microinclusion additive is in the form of micro-scale domains,
• wherein the continuous phase constitutes from about 60 wt. % to about 99 wt % of the thermoplastic composition,
• wherein the nanoinclusion additive constitutes from about 0.01 wt. % to about 15 wt. % of the thermoplastic composition based on the weight of the thermoplastic composition,
• wherein the microinclusion additive constitutes from about 0.1 wt. % to about 30 wt. % of the thermoplastic composition based on the weight of the thermoplastic composition,
• wherein a porous network is defined in the composition that includes a plurality of nanopores adjacent to the nano-scale domains and/or the micro-scale domains and formed by drawing of the film, the nanopores having an average cross-sectional dimension of about 800 nanometers or less, and the total pore volume of the composition is from about 15% to about 80% per cubic centimeter, and
• wherein the drawn film is a fluid-impermeable film having a hydrohead value of about 50 centimeters or more as determined in accordance with ATTCC 127-2008.