| 摘要 |
<p>A biaxially oriented heat sealable multilayer film structure, suited for use in high altitude applications, which comprises: (a) a core substrate having two surfaces, comprising i) a layer of homopolymer polyolefin and ii) a layer of block copolymer of ethylene and propylene having a MFR of 1 to 10, adjacent to at least one side of i); (b) a polymeric heat sealable layer on one surface of said core substrate, said heat sealable layer comprising a polymeric material selected from the group consisting of a terpolymer of ethylene, propylene and butene-1, a random copolymer of ethylene and propylene, a random copolymer of propylene and butene-1, and blends thereof; and optionally, (c) a high density polyethylene (HDPE) layer adjacent to the other surface of said core substrate (a).</p> |
