Flexible film composition for heat seals and container thereof

摘要

The present disclosure is directed to compositions and film structures suitable for heat seal production. The heat scalable flexible film structure includes:
a layer (A) comprising a blend comprising from 35 to 80 percent by weight of the layer (A) of a propylene based plastomer or elastomer ("PBPE") and from 20 to 65 percent by weight of the layer (A) of a low density polyethylene having a density in the range of from 0.915 g/cm 3 to 0.935 g/cm 3 , wherein the blend has a melt index (as determined according to ASTM D-1238 (at 190°C/2.16 Kg)
a layer (B), adjacent to layer (A), comprising a polyolefin-based polymer, wherein the polymer or polymer blend which makes up layer (B) flows more easily than the blend of layer (A) under conditions intended for making a hard seal with the film structure; and
an outermost layer (C) comprising a material having a melting point greater than 140°C; wherein the ratio of the thickness of layer (B) to the thickness of layer (A) is 3:1 or greater. The heat scalable flexible film structure is used to make a flexible container having one or more heat seals. The heat seal can be a frangible heat seal, a hard heat seal, or a combination of frangible heat seals and hard heat seals depending on the sealing conditions.