HMW HDPE film with improved impact strength
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United States of America Patent
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Jan 11, 2000
Grant Date -
N/A
app pub date -
Mar 17, 1997
filing date -
Mar 17, 1997
priority date (Note) -
Expired
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Abstract
A polymeric multilayer film is disclosed that has improved gloss, dart drop and total energy dart drop while having structural qualities that are not significantly compromised. The film is composed of first film layer of a low polydispersity polyethylene copolymer and a second film layer of a high molecular weight high density polyethylene (HMW HDPE) polymer. The first film layer polymer has a polydispersity of from about 1 to about 4. In a preferred embodiment, this low polydispersity polymer is formed in the presence of a metallocene catalyst. The HMW HDPE polymer has a melt index of less than 0.1 and a density of at least about 0.940 g/cm.sup.3. Any of the layers of the film may be constructed of polymer blends with additional layers being contemplated.
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