Composite film structure for manufacturing pouches using...

B - Operations – Transporting – 32 – B

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B32B 27/32 (2006.01) B32B 27/08 (2006.01) B65D 65/40 (2006.01) C08J 5/18 (2006.01) C08L 23/08 (2006.01) C08L 23/16 (2006.01) C08L 23/06 (2006.01)

Patent

CA 2463958

A sealant layer for use in a composite film structure, which includes at least one non-melting layer, the structure being for manufacturing pouches for containing flowable material utilizing high speed vertical form, fill and seal processes with rotary thermic sealing, the sealant layer comprising from about 70 to about 90% by weight of a single-site catalyst C4-C10 ethylene alpha- olefin polymer having a density in the range of from .890 to about .912 gm/cc and a melt index in the range of from about .2 to about 2.0 dg/cc, and from about 10 to about 30% by weight of one or more of the following: a linear low density polyethylene selected from single-site catalyst and multi-site catalyst polymers, the polyethylenes having a density in the range of from about 0.916 to about 0.930 gm/cc, a high pressure low density polyethylene and processing additives.

L'invention concerne une couche d'agent de scellement destinée à être utilisée dans une structure de film composite, laquelle comprend au moins une couche non fusible, la structure permettant la fabrication de poches destinées à contenir une matière fluide à l'aide de processus verticaux rapides de formage-remplissage-scellage par scellement thermique rotatif, la couche d'agent de scellement contenant environ 70 à environ 90 % en poids d'un polymère catalyseur mono-site d'éthylène alpha-oléfine C<sb>4</sb>-C<sb>10</sb> ayant une densité dans la gamme allant de 0,890 à environ 0,912 gm/cc et un indice de fusion dans la gamme allant de 0,2 à environ 2,0 dg/cc, et à environ 10 à environ 30 % en poids d'un ou plusieurs des éléments suivants: un polyéthylène basse densité linéaire choisi entre des polymères catalyseurs mono-site et multi-sites, les polyéthylènes ayant une densité dans la gamme allant d'environ 0,916 à environ 0,930 gm/cc, un polyéthylène basse densité à haute pression et des additifs de traitement.

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