Patent ID: 6262174
Filing Date: 2001-07-17
Classification: C08L,Y10T

Abstract:
A heat-sealable film layer comprising:(a) from about 2 to about 13 percent by weight of polypropylene which is a homopolymer or copolymer comprising at least about 93 percent propylene and less than about 8 percent alpha-olefin based on the weight of the polymer, and which has a melt flow rate of from about 1.0 to about 50 dg/minute as measured in accordance with ASTM D-1238, Condition 230.degree. C./2.16 kg;(b) from about 87 to about 98 percent by weight of a polymer selected from the group consisting of linear ethylene polymer, substantially linear ethylene polymer, low density ethylene polymer, and mixtures thereof;wherein the linear ethylene polymer and substantially linear ethylene polymer are characterized by:(1) a density of from about 0.87 to about 0.96 g/cm.sup.3,(2) a molecular weight distribution, M.sub.w /M.sub.n of less than or equal to about 5,(3) a melt index, I.sub.2, as measured in accordance with ASTM D-1238, Condition 190.degree. C./2.16 kg of from about 0.5 to about 20.0 dg/minute; andwherein the low density ethylene polymer is characterized by:(1) a density of from about 0.91 to about 0.96 g/cm.sup.3, and(2) a melt index, I.sub.2, as measured in accordance with ASTM D-1238, Condition 190.degree. C./2.16 kg of from about 0.1 to about 20.0 dg/minuteand wherein the film layer comprises at least about 5 percent by weight of the low density ethylene polymer.