Shrink films and method for making films having maximum heat...

Details Shrink films and method for making films having maximum heat... Shrink films and method for making films having maximum heat...

C - Chemistry, Metallurgy

08

J

C08J 5/18 (2006.01) B29C 47/06 (2006.01) B29C 55/10 (2006.01) B32B 27/32 (2006.01) C08L 23/02 (2006.01)

Patent

CA 2247082

This invention relates to a method for preparing orienting polyolefin wherein stretching or orientation conditions are defined to maximize the unrestrained shrink response of the film. The invention also relates to a shrink film structure as well as to a shrink film structure made by the novel method wherein in each case the shrink film comprises as the shrink control layer at least one homogeneously branched ethylene interpolymer having a polymer density of less than 0.91 g/cc. The method has commercial and developmental benefits and the film structures can be employed in such uses as industrial collating of paper goods and barrier meat packaging.

La présente invention se rapporte à un procédé permettant de préparer de la polyoléfine dont les conditions d'élasticité et d'orientation sont définies de manière à maximiser le rétrécissement illimité de la pellicule. Ladite invention concerne également une structure de pellicule rétractable ainsi qu'une structure de pellicule rétractable fabriquée selon le nouveau procédé où dans chaque cas, la pellicule rétractable comprend comme couche de régulation de rétrécissement au moins un interpolymère d'éthylène à ramification homogène présentant une masse volumique inférieure à 0,91g/cm?3¿. Ce procédé présente des avantages commerciaux et sur le plan du développement et les structures de pellicules peuvent être utilisées pour l'emballage industriel d'articles en papier et le conditionnement de viande sous matériaux barrières.

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