Film layers made from polymer formulations

Details Film layers made from polymer formulations Film layers made from polymer formulations

C - Chemistry, Metallurgy

08

L

C08L 23/06 (2006.01)

Patent

CA 2558005

Film layers made from formulated polymer compositions are disclosed. Film layers made from such formulated compositions have surprisingly good (for example, low) water vapor transmission rates and are particularly useful for packaging dry goods such as cereal. The polymer compositions preferably have at least one homogeneous ethylene homopolymer and at least one heterogeneously branched ethylene polymer. The homogeneous ethylene homopolymer has a molecular weight much higher than that of the heterogeneously branched ethylene polymer, although the density of each is preferably higher than about 0.95 g/cm3.

L'invention porte sur des couches de films de composés de polymères qui se sont avérées présenter des taux de transmission de la vapeur d'eau surprenamment favorables, (par exemple bas), et sont particulièrement utiles pour l'emballage de produits secs tels que des céréales. Lesdits composés comportent de préférence au moins un homopolymère d'éthylène homogène, et au moins un polymère d'éthylène hétérogène ramifié. L'homopolymère d'éthylène homogène a un poids moléculaire beaucoup plus élevé que le polymère d'éthylène hétérogène ramifié, bien que la densité de chacun d'eux soit de préférence supérieure à 0,95 g/cm?3¿.

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