Microporous multi-layer membrane film based on polypropylene...

Details Microporous multi-layer membrane film based on polypropylene... Microporous multi-layer membrane film based on polypropylene...

B - Operations, Transporting

32

B

B32B 5/32 (2006.01) B29C 55/14 (2006.01) B32B 27/18 (2006.01) B32B 27/32 (2006.01) H01M 2/16 (2006.01) C08L 23/10 (2006.01) C08L 23/12 (2006.01)

Patent

CA 2723110

The invention relates to a biaxially oriented microporous film composed of at least three coextruded layers encompassing an internal cut-off layer and two external layers, wherein all three layers contain a mixture of propylene homopolymer and propylene block copolymer and .beta.-nucleation agent. The propylene block copolymer I of the external layers has a melting point exceeding 140 °C and the propylene block copolymer II of the internal layer has a melting range starting at a temperature ranging from 50 to 120 °C and the melting point of the propylene block copolymer I is greater than the melting point of the propylene block copolymer II.

L'invention concerne un film microporeux à orientation biaxiale composé d'au moins trois couches coextrudées, comprenant une couche de mise hors service intérieure et deux couches extérieures, les trois couches renfermant un mélange d'homopolymère de propylène et de copolymère séquencé de propylène et d'un agent de nucléation ß. L'invention est caractérisée en ce que le copolymère séquencé de propylène I des couches extérieures présente un point de fusion supérieur à 140°C, et en ce que le copolymère séquencé de propylène II de la couche intérieure présente une plage de fusion qui commence à une température comprise entre 50 et 120°C, et en ce que le point de fusion du copolymère séquencé de propylène I est supérieur au point de fusion du copolymère séquencé de propylène II.

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