Permeable polypropylene film

B - Operations – Transporting – 32 – B

Patent

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Details

B32B 27/20 (2006.01) B32B 27/18 (2006.01) B32B 27/32 (2006.01) C08K 3/22 (2006.01) C08K 5/092 (2006.01) C08K 5/098 (2006.01)

Patent

CA 2605363

A permeable, propylene-containing film structure including a core layer containing a propylene polymer matrix that has been cavitated by a two- component cavitation system, wherein the first component of the two-component cavitation system is a beta-nucleating agent to produce the beta-crystalline form of polypropylene and the second component is a filler. The film structure also includes first and second thermoplastic skin layers on either side of the core layer, respectively. A method of manufacturing a permeable propylene- containing film structure, including: forming a melt containing a propylene polymer, a beta- nucleating agent and a filler; cooling the melt to form a film layer; and stretching the film layer. The film structure has a water vapor transmission rate greater than 300 g/m2/day and a Gurley air permeability less than 3,000 s/10 cc.

La présente invention concerne une structure de film contenant du propylène perméable comprenant une couche centrale contenant une matrice de polymère propylène dont les cavitations ont été formées par un système de cavitation à deux composants, le premier composant de ce système est un agent de nucléation bêta destiné à produire la forme cristalline bêta du polypropylène et le second composant est une charge. Cette structure de film comprend aussi une première et une seconde couche de peau thermoplastique des deux côtés de la couche centrale, respectivement. Cette invention concerne aussi un procédé de fabrication de film contenant un propylène perméable qui consiste: à former un mélange contenant un polymère propylène, un agent de nucléation bêta et une charge, à refroidir le mélange de façon à former une couche de film et à étirer cette couche de film. Cette structure de film possède une vitesse de transmission de vapeur d'eau supérieure à300 g/m2/jour et une perméabilité à l'air Gurley <3,000 s/10 cc..

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