Microporus membrane from cold-rolled precursor films

C - Chemistry – Metallurgy – 08 – J

Patent

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C08J 9/36 (2006.01) B01D 69/12 (2006.01) B29C 55/12 (2006.01) B29C 55/18 (2006.01) C08J 5/18 (2006.01) B29C 71/00 (2006.01)

Patent

CA 2007160

The process for forming a microporous polymeric semi-crystalline film, involving the steps of cold compressive extruding a precursor film, preferably in a biaxial fashion, so as to compress the film by a factor of about 2 to 1 to about 10 to 1, stretching the film by about 100 to about 500 percent, preferably in a biaxial fashion, and heat annealing either before, during; or preferably after the stretching step at a temperature up to the alpha transition temperature of the polymer for a time sufficient to maintain the microporous character of the final film.

rocédé pour former une pellicule semi-cristalline polymérique microporeuse, comportant les étapes d'extrusion par compression d'une pellicule initiale, préférablement de façon biaxiale, de manière à comprimer la pellicule par un facteur allant de 2 à 1 à environ 10 à 1, d'étirage de la pellicule d'environ 100 à 500 p. 100, préférablement de façon biaxiale, et d'adoucissement à la chaleur soit avant, pendant ou préférablement après l'étape de l'étirage à une température s'élevant à la température de transition alpha du polymère pendant une durée suffisante pour maintenir le caractère microporeux de la pellicule finale.

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