B - Operations – Transporting – 29 – C
Patent
B - Operations, Transporting
29
C
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.
Haire Charles
Wei Xiangyun
Celgard Llc
Perley-Robertson Hill & Mcdougall Llp
LandOfFree
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