BIAXIALLY STRETCHED POROUS FILM

A film that comprises a thermoplastic composition that contains a continuous phase that includes a polyolefin matrix polymer and a nanoinclusion additive dispersed within the continuous phase in the form of discrete domains is provided. The film is biaxially stretched in a machine direction and cros...

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Bibliographische Detailangaben
Hauptverfasser: TOPOLKARAEV, Vasily, A, MCENEANY, Ryan, J, STOPPER, Steven R
Format: Patent
Sprache:eng ; fre ; ger
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Beschreibung
Zusammenfassung:A film that comprises a thermoplastic composition that contains a continuous phase that includes a polyolefin matrix polymer and a nanoinclusion additive dispersed within the continuous phase in the form of discrete domains is provided. The film is biaxially stretched in a machine direction and cross-machine direction to form a porous network in the composition. The porous network contains nanopores having a maximum cross-sectional dimension of about 800 nanometers or less. At least a portion of the nanopores are oriented in the cross-machine direction so that the axial dimension generally extends in the cross-machine direction and the cross-sectional dimension generally extends in the machine direction.