Method for producing microporous sheet

Details Method for producing microporous sheet Method for producing microporous sheet

C - Chemistry, Metallurgy

08

J

C08J 9/00 (2006.01) C08J 9/28 (2006.01)

Patent

CA 2716840

Provided is a method of producing a microporous sheet material of a polymeric matrix of polyolefin, with finely divided and substantially water-insoluble filler distributed throughout the matrix, and a network of interconnecting pores communicating throughout the microporous material. The method includes: (a) forming a mixture of polyolefin, filler and a processing plasticizer composition; (b) extruding the mixture to form a continuous sheet; and (c) contacting the continuous sheet with a non-flammable extraction fluid composition to extract the processing plasticizer composition from the continuous sheet. The extraction fluid has a boiling point of 75°C or less, and is essentially free of trichloroethylene. The microporous sheet material has Tensile Strength equal to or greater than 800 kPa. A microporous sheet material also is provided.

L'invention porte sur un procédé de fabrication d'une matière en feuille microporeuse d'une matrice polymère de polyoléfine, avec une charge finement divisée et sensiblement insoluble dans l'eau distribuée dans toute la matrice et un réseau de pores d'interconnexion communiquant dans toute la matière microporeuse. Le procédé consiste à : (a) former un mélange de polyoléfine, de charge et d'une composition de plastifiant de traitement ; (b) extruder le mélange pour former une feuille continue ; et (c) mettre en contact la feuille continue avec une composition de fluide d'extraction ininflammable pour extraire la composition de plastifiant de traitement de la feuille continue. Le fluide d'extraction a un point d'ébullition de 75°C ou moins, et est sensiblement exempt de trichloroéthylène. La matière en feuille microporeuse a une résistance à la traction égale ou supérieure à 800 kPa. L'invention porte également sur une matière en feuille microporeuse.

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