Metallic multilayer film

C - Chemistry – Metallurgy – 09 – J

Patent

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Details

C09J 123/10 (2006.01) B32B 7/12 (2006.01) B32B 15/08 (2006.01) B65D 65/40 (2006.01) C08J 5/12 (2006.01) C08J 5/18 (2006.01) C08L 23/04 (2006.01) C08L 23/10 (2006.01) C09J 7/02 (2006.01) C09J 123/04 (2006.01) C08L 23/08 (2006.01) C08L 51/06 (2006.01)

Patent

CA 2456668

The subject of the invention is a metallized film produced using a multilayer structure comprising a tie layer comprising: 5 to 50% by weight of a blend (A) comprising: 5 to 100% of a cografted blend of polymers (C1) and (C2), consisting of 90 to 20% by weight of a metallocene polyethylene (C1) of density between 0.865 and 0.915 and of 10 to 80% by weight of a polymer (C2) which is either a non-metallocene LLDPE or a polypropylene homopolymer or copolymer, and 95 to 0% by weight of a polyethylene (D) chosen from polyethylene homopolymers or copolymers and elastomers; the blend (A) being such that: the content of grafting monomer grafted is between 30 and 105 ppm the MFI or meltflow index (ASTM D 1238, at 190° C./2.16 kg) is between 0.1 and 30 g/10 min; 50 to 95% by weight of a polypropylene homopolymer or copolymer (B).

L'invention a pour objet un film métallisé réalisé à l'aide d'une structure multicouche comprenant une couche de liant comprenant: - 5 à 50% en poids d'un mélange (A) comprenant: - 5 à 100% d'un mélange de polymères (C1) et (C2) cogreffé constitué de 90 à 20% en poids d'un polyéthylène métallocène (C1) de densité comprise entre 0,865 et 0,915 et de 10 à 80 % en poids d'un polymère (C2) qui est soit un LLDPE non métallocène, soit un polypropylène homo- ou copolymère, et - 95 à 0% en poids d'un polyéthylène (D) choisi parmi les polyéthylènes homo ou copolymères et les élastomères ; le mélange (A) étant tel que: .cndot. la teneur en monomère de greffage greffé est comprise entre 30 et 10 5 ppm ; .cndot. le MFI ou indice d'écoulement à l'état fondu (norme ASTM D 1238, à 190°C sous 2,16kg) est compris entre 0,1 et 30g/10min - 50 à 95% en poids d'un polypropylène (B) homo ou copolymère.

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