Biaxially oriented microporous membrane

B - Operations – Transporting – 29 – C

Patent

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Details

B29C 39/00 (2006.01) D01D 5/12 (2006.01)

Patent

CA 2637623

A microporous membrane is made by a dry- stretch process and has substantially round shaped pores and a ratio of machine direction tensile strength to transverse direction tensile strength in the range of 0.5 to 5Ø The method of making the foregoing microporous membrane includes the steps of : extruding a polymer into a nonporous precursor, and biaxially stretching the nonporous precursor, the biaxial stretching including a machine direction stretching and a transverse direction stretching, the transverse direction including a simultaneous controlled machine direction relax.

La présente invention concerne une membrane microporeuse fabriquée par un procédé d'étirement à sec et présente des pores sensiblement ronds et un rapport de la résistance à la traction dans le sens machine à la résistance à la traction dans le sens transversal dans la plage de 0,5 à 5,0. Le procédé de fabrication de ladite membrane comprend les étapes consistant à : extruder un polymère en un précurseur non poreux et étirer bi-axialement ledit précurseur, l'étirement bi-axial comprenant un étirement dans le sens machine et un étirement dans le sens transversal, ce dernier comprenant un relâchement dans le sens machine contrôlé simultané.

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