Composition and films thereof

B - Operations – Transporting – 32 – B

Patent

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Details

B32B 27/32 (2006.01) B65D 65/40 (2006.01) C08J 5/18 (2006.01) B29C 47/06 (2006.01) C08L 23/06 (2006.01) C08L 23/12 (2006.01)

Patent

CA 2397808

The present invention includes a coextruded film having at least two layers. The first layer contains a coupled propylene polymer and the second layer contains an in-reactor blend of a linear low density polyethylene fraction and a substantially linear polyethylene fraction. Alternatively, the second layer may include a homogeneously branched linear polyethylene. Preferably, the first layer makes up about 50 weight percent or less of the overall coextruded film structure. The first layer may also contain a polyethylene, such as a linear low density polyethylene, a low density polyethylene, a high density polyethylene, substantially linear polyethylene, a homogeneously branched linear polyethylene, an in-reactor blend of linear low density polyethylene and a substantially linear polyethylene, and blends thereof.

L'invention concerne un film coextrudé comprenant au moins deux couches. La première couche comprend un polypropylène couplé et la seconde couche comprend un mélange en pile d'une fraction de polyéthylène basse densité et linéaire et d'une fraction de polyéthylène sensiblement linéaire. Dans un autre mode de réalisation, la seconde couche peut comprendre un polyéthylène linéaire à ramifications homogènes. De préférence, la première couche compte pour environ 50 % en poids ou moins de l'ensemble de la structure de film coextrudé. La première couche peut également contenir un polyéthylène, tel qu'un polyéthylène basse densité linéaire, un polyéthylène basse densité, un polyéthylène haute densité, un polyéthylène sensiblement linéaire, un polyéthylène linéaire à ramifications homogènes, un mélange en pile d'un polyéthylène basse densité et linéaire et d'un polyéthylène sensiblement linéaire, et des mélanges de ceux-ci.

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