Multi-layered film with polypropylene and polyethylene...

B - Operations – Transporting – 32 – B

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B32B 27/32 (2006.01) B29C 47/06 (2006.01) B32B 37/00 (2006.01) B29C 47/00 (2006.01)

Patent

CA 2131085

The invention relates to a multilayer film comprising two external layers and at least one intermediary layer. For all the successive layers forming the film, it comprises at least once the succession of the three following layers; (A) layer comprising (a) at least one propylene homopolymer, and/or (b) at least one propylene/ alpha -olefin copolymer; the binding layer (L) comprising (e) at least one ethylene/ alpha -olefin copolymer; (B) layer comprising (c) at least one radical polymer of the ethylene (homopolymer of ethylene or copolymer of ethylene/polar comonomer), or (d) a mixture of at least one polymer such as defined in (c) with up to 20 % by weight of said radical polymer of ethylene, at least one linear copolymer of ethylene/ alpha -olefin; the binding layer (L) being arranged between the layers (A) and (B), and, when the multilayer film comprises more than one layer of a given type (A), (B) and (L), the constituants of the different layers of the same type may be identical or different. Utilization in the field of retractable covers.

2131085 9415787 PCTABS00167 L'invention concerne un film multicouche comprenant deux couches externes et au moins une couche intermédiaire. Pour toutes les couches successives qui le composent, il comprend au moins une fois la succession des trois couches suivantes: (A) couche comprenant (a) au moins un homopolymère du propylène, et/ou (b) au moins un copolymère propylène - .alpha.-oléfine; (L) couche liante comprenant (e) au moins un copolymère éthylène - .alpha.-oléfine; (B) couche comprenant (c) au moins un polymère radicalaire de l'éthylène (homopolymère de l'éthylène ou copolymère de l'éthylène - comonomère polaire), ou (d) un mélange d'au moins un polymère tel que défini en (c), avec jusqu'à 20 % en poids par rapport audit polymère radicalaire de l'éthylène, d'au moins un copolymère linéaire éthylène - .alpha.-oléfine; la couche liante (L) étant disposée entre les couches (A) et (B), et, lorsque le film multicouche comporte plus d'une couche d'un type donné (A), (B) et (L), les constituants des différentes couches du même type pouvant être identiques ou différents. Utilisation dans le domaine des housses rétractables.

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