Method for producing polyolefin microporous polyolefin membrane

C - Chemistry – Metallurgy – 08 – J

Patent

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C08J 9/00 (2006.01) C08J 9/26 (2006.01) H01M 2/16 (2006.01)

Patent

CA 2611274

Disclosed is a method for producing a polyolefin microporous membrane wherein a melt-mixed blend of a polyethylene resin, a polypropylene having a mass average molecular weight of not less than 1 ~ 105 and an ethylene content of not more than 5 mass%, and a solvent for film formation is extruded from a die, then a gel sheet is obtained by slowing cooling the thus-obtained extrusion molded body, and the thus-obtained gel sheet is stretched and the solvent is removed, thereby forming a polyolefin microporous membrane. In this method, the slow cooling rate of the extrusion molded body is set at not more than 30~C/sec.

La présente invention se rapporte à un procédé de production d~une membrane microporeuse en polyoléfine, dans laquelle un mélange obtenu par fusion d~une résine de polyéthylène, un polypropylène ayant un poids moléculaire moyen en masse supérieur ou égal à 1 x 105 et un contenu en éthylène inférieur ou égal à 5 % en masse et un solvant pour la formation du film est extrudé d~une filière, puis une feuille de gel est obtenue en refroidissant lentement le corps moulé par extrusion ainsi obtenu et la feuille de gel ainsi obtenue est étirée, le solvant est retiré, formant ainsi une membrane microporeuse en polyoléfine. Selon ce procédé, la vitesse de refroidissement lent du corps moulé par extrusion est établie à une valeur inférieure ou égale à 30 °C/sec.

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