Shrink film having balanced properties or improved toughness...

C - Chemistry – Metallurgy – 08 – L

Patent

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Details

C08L 23/04 (2006.01) B29C 55/12 (2006.01) B29D 7/01 (2006.01) C08J 5/18 (2006.01) C08L 23/08 (2006.01) C08L 23/20 (2006.01)

Patent

CA 2272081

This invention relates to an improved shrink film obtained by selectively controlling and optimizing the density differential between at least two polyolefin polymer components to provide narrow density splits. One aspect of this invention relates to a biaxially oriented polyolefin shrink film having balanced properties and another aspect of this invention relates to an oriented shrink film having improved toughness. This invention also relates to a biaxial orientation method of making an improved shrink film using elaborate shrink orientation techniques such as tenter framing, double-bubble, trapped bubble, tape orientation or combinations thereof. Most preferably, the first polyolefin polymer component is a lower density, substantially linear ethylene/.alpha.-olefin interpolymer and the second polyolefin polymer component is a higher density, heterogeneously branched ethylene .alpha.- olefin interpolymer.

La présente invention concerne un film rétractable amélioré, obtenu en régulant et en optimisant sélectivement le différentiel de densité entre au moins deux composants polymères de polyoléfine, de manière à obtenir des écarts de densité réduits. La présente invention concerne, d'une part un film rétractable de polyoléfine orienté biaxialement présentant des propriétés équilibrées, et d'autre part un film rétractable orienté dont la ténacité est améliorée. La présente invention concerne, enfin, un procédé d'orientation biaxiale permettant de fabriquer un film rétractable en utilisant des techniques d'orientation de rétraction telles que le cadrage de rame, la double bulle, la bulle piégée, une orientation de bande ou leurs combinaisons. Le premier composant est, de préférence, un interpolymère d'éthylène/ alpha -oléfine sensiblement linéaire à faible densité et le second composant est un interpolymère d'éthylène/ alpha -oléfine ramifié de manière hétérogène à densité élevée.

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