Multi-layer films with improved properties

Details Multi-layer films with improved properties Multi-layer films with improved properties

B - Operations, Transporting

32

B

B32B 27/32 (2006.01) C08L 23/04 (2006.01) C08L 23/08 (2006.01) C08L 23/10 (2006.01)

Patent

CA 2591575

A method of improving hot tack and/or seal strength in a multi-layer film by selecting a first PE comprising at least one of mPE, LDPE or LLDPE to form a first layer and selecting a blend comprising a mPE and a PP to form an outer layer; and coextruding the first PE and the blend to form the multi-layer film comprising the first layer and the outer layer; wherein the inner layer comprises at least one component having a final melting point at least about 15 ~C higher than a final melting point of at least one component of the first layer, wherein the multi-layer film has a maximum hot tack at least about 25 % greater than a similar multi-layer film with 0-weight % of the PP in the inner layer.

L'invention concerne un procédé permettant d'améliorer l'état collant à chaud et/ou l'étanchéité d'une pellicule multicouche. Ce procédé consiste à sélectionner un premier polyéthylène (PE) comprenant un polyéthylène métallocène (mPE) et/ou un polyéthylène à basse densité (LDPE) ou un polyéthylène linéaire à basse densité (LLDPE), pour former une première couche, puis à sélectionner un mélange comprenant un mPE et un polypropylène (PP) pour former une couche externe. La couche interne comprend au moins un composant dont le point de fusion final est supérieur d'au moins 15 °C environ à celui d'un composant de la première couche. La pellicule multicouche possède un état collant à chaud maximal qui est supérieur d'au moins 25 % environ à celui d'une pellicule multicouche similaire avec un pourcentage en masse nul de PP dans la couche interne.

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