Liquid packages having improved leaker frequency performance

Details Liquid packages having improved leaker frequency performance Liquid packages having improved leaker frequency performance

C - Chemistry, Metallurgy

08

L

C08L 23/04 (2006.01) B65D 33/00 (2006.01) C08J 5/18 (2006.01) C08L 23/08 (2006.01) C08L 23/06 (2006.01)

Patent

CA 2341390

A pouch for containing a flowable material, said pouch being made from a film in tubular form and having transversely heat-sealed ends, said film comprising at least one layer made from a material comprising from about 70 to about 100 parts of at least one interpolymer of ethylene and a C3-C20 alpha-olefin having a density of from 0.840 to 0.940 g/cm3 and a melt index of 0.01 to 2.0 dg/min, and from about 0 to about 30 parts by weight of at least one high- pressure polyethylene having a density of at least about 0.916 g/cm3 and a melt index of from about 0.01 to about 2 dg/min, said film having an overall melt strength of from about 10 to about 15 centiNewtons as determined using a Goettfert Rheotens unit at 190~, and the transverse seal integrity of the pouch is such that leaker frequency rate for pouches, as measured in terms of 10,000 pouches produced, is substantially reduced as compared with the leaker frequency rate for pouches produced from films having a melt strength outside the specified range. Also described is a process for making such pouches.

L'invention concerne un sac contenant une matière liquide, formé d'un film tubulaire et ayant des extrémités thermoscellées de manière transversale. Le film comprend au moins une couche d'une matière renfermant entre 70 et 100 parties environ d'au moins un interpolymère d'éthylène et une alpha-oléfine C¿3?-C¿20? dont la densité va de 0,840 à 0,940 g/cm?3¿ et dont l'indice de fluidité fluctue entre 0,01 et 2,0 dg/min et entre environ 0 et 30 parties en poids d'au moins un polyéthylène haute pression dont la densité est d'au moins 0,916 g/cm?3¿ et dont l'indice de fluidité fluctue entre 0,01 et 2 dg/min. Ce film présente une résistance à la fluidité globale comprise entre environ 10 et 15 centiNewtons, valeur déterminée par une unité Goettfert Theotens à 190·. L'intégrité de scellement transversal du sac est telle que le débit de fluidité pour les sacs, mesuré en termes de 10.000 sacs produits, est sensiblement réduit en comparaison avec la fréquence de fuites des sacs produits à partir de films ayant une résistance à la fluidité non comprise dans la plage spécifiée. Fait aussi l'objet de cette invention un procédé permettant de fabriquer ces sacs.

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