Preparing multi-layer coextruded polyolefin stretch wrap films
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United States of America Patent
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May 28, 1991
Grant Date -
N/A
app pub date -
Oct 25, 1988
filing date -
Oct 25, 1988
priority date (Note) -
Expired
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Abstract
The present invention relates to multi-layer coextruded thermoplastic stretch wrap films useful for the packaging or palletizing of goods. More particularly the films of this invention include at least three layers having two outer layers and at least one intermediate layer placed between the outer layers. The intermediate layer is formed from a high pressure low density polyethylene resion and the outer layers are formed from a linear low density polyethylene copolymer such as ethylene copolymerized with a minor amount of at least on C.sub.4 to C.sub.10 alpha-olefin, such as hexene-1, octene-1, decene-1, 4-methyl-pentene-1 and butene-1. The force required to stretch the films of this invention may be controlled by the thickness of the intermediate layer relative to overall film thickness, the melt index of the intermediate layer resin, the molecular weight of the intermediate layer resin or a combination thereof.
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