Multilayer microporous membrane

B - Operations – Transporting – 01 – D

Patent

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Details

B01D 69/02 (2006.01) B01D 67/00 (2006.01) B01D 69/08 (2006.01) B01D 71/34 (2006.01) C08J 9/26 (2006.01)

Patent

CA 2456170

A multilayer microporous membrane containing a thermoplastic resin, comprising a coarse structure layer with a higher open pore ratio and a fine structure layer with a lower open pore ratio, wherein said coarse structure layer is present at least in one membrane surface having a thickness of not less than 5.0 µm, a thickness of said fine structure layer is not less than 50% of the whole membrane thickness, and said coarse structure layer and said fine structure layer are formed in one-piece.

L'invention concerne un film microporeux multicouches comprenant une résine thermoplastique, une couche à structure rugueuse qui présente une proportion élevée de pores ouverts et une couche à structure dense qui présente une faible proportion de pores ouverts, ladite couche à structure rugueuse étant présente sur au moins une partie de la surface du film, cette couche présentant une épaisseur d'au moins 5,0 mu m, ladite couche à structure dense présentant une épaisseur représentant au moins 50 % de celle de la totalité du film, ladite couche à structure rugueuse et ladite couche à structure dense étant intégrées l'une à l'autre.

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