High strength porous film of polypropylene and process for...

B - Operations – Transporting – 29 – C

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B29C 55/12 (2006.01) B29C 55/00 (2006.01) B29D 7/01 (2006.01) C08J 5/18 (2006.01) H01M 2/16 (2006.01)

Patent

CA 2203734

Disclosed is a high strength porous film of polypropylene which comprises predominantly a polypropylene resin and possesses the following physical properties: (1) a tensile strength of at least 35 MPa in machine direction (MD) and transverse direction (TD); (2) a porosity of not more than 80%; and (3) a moisture permeability of at least 20 g/m2 day. The porous film may be produced by stretching or thermally treating a biaxially stretched polypropylene film. The high strength porous film may be used for wrapping food or as a separator of a secondary battery.

On divulgue une pellicule de polypropylène poreuse de haute résistance qui comprend de façon prédominante une résine de polypropylène et qui présente les propriétés physiques suivantes : (1) une résistance à la traction d'au moins 35 MPa dans le sens de fabrication et dans le sens travers; (2) une porosité n'excédant pas plus de 80 %; et (3) une perméabilité à l'humidité d'au moins 20 g/m2 par jour. La pellicule poreuse peut être produite par étirage ou traitement thermique d'une pellicule de polypropylène étirée biaxialement. La pellicule poreuse de haute résistance peut être utilisée pour emballer les aliments ou comme séparateur dans une secondaire.

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