High density polyethylene compositions, a process for the production thereof and films prepared
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United States of America Patent
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May 13, 2003
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N/A
app pub date -
Nov 9, 2000
filing date -
Apr 6, 1998
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Abstract
The present invention concerns a bimodal film-making HDPE composition, a process for the preparation thereof, a film prepared thereof and a film-making process. The composition comprises at least one polyethylene component having a relatively low molecular weight and another polyethylene component having a relatively high molecular weight. The composition has a shear thinning index defined by the relationship: SHI.sub.5/300.ltoreq.0.00014 .eta..sub.5kPa +78 wherein .eta..sub.5kPa is the complex viscosity at G*=5 Pa and SHI.sub.5/300 is the ratio of complex viscosity at G*=5 kPa to the complex viscosity at G*=300 kPa. By means of the invention it is possible to produce material for making HDPE blown films with good mechanical properties in a process where the whole range of PE products from LLD to HD can be produced.
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