Film layers made from polymer formulations
AssigneeDow Global Technologies LLC
InventorsMridula Kapur, David A. Eversdyk, Wenbin Liang, Kenneth S. Laverdure, David T. Gillespie
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Abstract
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.
Claims10
An ethylene homopolymer or interpolymer composition having a percentage fraction of a GPC-LS chromatogram which has a molecular weight equal to or greater than 1,000,000 as determined by gel permeation chromatography with a low angle laser light scattering detector is at least 2.5 percent but no more than about 20 percent of the total area of the GPC-LS chromatogram;
- and having a percentage fraction of a GPC-RI chromatogram which has a molecular weight equal to or less than about 10,000 as determined by gel permeation chromatography with a differential refractometer is no more than about 25 percent but at least about 10 percent of the total area of the GPC-RI chromatogram.
Dependencies are inferred from the claim text.