Loading patent…
AssigneeThe Dow Chemical Company
InventorsLawrence T. Kale, Pradeep Jain, David C. Kelley, Deepak R. Parikh, Sharon L. Baker, Osborne K. McKinney
Estimating the term…
An ethylene polymer extrusion composition having high draw down and substantially reduced neck-in, a process for making such a composition and a process of using such a composition to prepare extrusion coatings, extrusion profiles and extrusion cast films are disclosed. The ethylene polymer extrusion composition is made of 75-95 weight percent of at least one ethylene .alpha.-olefin interpolymer and 5-25 weight percent of at least one high pressure ethylene polymer characterized as having high melt strength and a broad, bimodal molecular weight distribution. In profiles, coatings or films, the composition can be used as sealant, adhesive or abuse resistance layers.
An ethylene polymer extrusion composition comprising from about 80 to 95 percent, by weight of the total composition, of at least one ethylene/.alpha.-olefin interpolymer composition selected from the group consisting of a homogeneously branched linear ethylene polymer composition and a heterogeneously branched linear ethylene polymer composition, wherein the ethylene/.alpha.-olefin polymer is characterized as having a density in the range of 0.85 g/cc to 0.940 g/cc and from about 5 to 20 percent, by weight of the total composition, of at least one high pressure ethylene polymer characterized as having a melt index, I.sub.2, less than 6.0 g/10 minutes, a density of at least 0.916 g/cc, a melt strength of at least 9 cN as determined using a Gottfert Rheotens unit at 190.degree. C., a M.sub.w /M.sub.n ratio of at least 7.0 and a bimodal molecular weight distribution as determined by gel permeation chromatography, wherein the ethylene polymer extrusion composition has a melt index, I.sub.2, of at least 1.0 g/10 minutes.
A process for using an ethylene polymer extrusion composition to make an extrusion coated substrate, an extrusion profile or an extrusion cast film comprising:
An article comprising at least one layer of an ethylene polymer extrusion composition, wherein the extrusion composition comprises from about 80 to 95 percent, by weight of the total composition, of at least one ethylene/.alpha.-olefin interpolymer composition selected from the group consisting of a homogeneously branched linear ethylene polymer composition and a heterogeneously branched linear ethylene polymer composition, wherein the ethylene/.alpha.-olefin polymer is characterized as having a density in the range of 0.85 g/cc to 0.940 g/cc and from about 5 to 20 percent, by weight of the total composition, of at least one high pressure ethylene polymer characterized as having a melt index, I.sub.2, less than 6.0 g/10 minutes, a density of at least 0.916 g/cc, a melt strength of at least 9 cN as determined using a Gottfert Rheotens unit at 190.degree. C., a M.sub.w /M.sub.n ratio of at least 7.0 and a bimodal molecular weight distribution as determined by gel permeation chromatography, and wherein the ethylene polymer extrusion composition has a melt index, I.sub.2, of at least 1.0 g/10 minutes.
Dependencies are inferred from the claim text.