Polyethylene blends
AssigneeEquistar Chemicals, LP
InventorSameer D. Mehta
Life of this patent
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Abstract
A blend comprising a high molecular weight, high density polyethylene (HMW HDPE) and a linear low density polyethylene (LLDPE) is disclosed. The blend comprises from about 50 wt. % to about 80 wt. % of HMW HDPE. The HMW HDPE has a density greater than about 0.94 g/cc and a melt index MI2 less than about 0.1 dg/min. The blend also comprises about 20 wt. % to about 50. wt % of LLDPE. The LLDPE has a density within the range of about 0.90 to about 0.93 g/cc and an MI2 within the range of about 0.5 to about 5 dg/min. The LLDPE is a copolymer of ethylene with 1-hexene that has a dart drop impact strength of greater than about 500 grams as measured by ASTM D1709/A. The blend shows increased resistance to environmental stress cracking.
Claims20
A polymer blend which comprises:
- (a) from about 50 wt % to about 80 wt % of a high molecular weight, high density polyethylene that has a density greater than about 0.94 g/cc and an MI2 less than about 0.1 dg/min;
- and
- (b) from about 20 wt % to about 50 wt % of a linear low density polyethylene that has a density within the range of about 0.90 to about 0.93 cc/g and an MI2 within the range of about 0.5 to about 5 dg/min, wherein the linear low density polyethylene is a copolymer of ethylene with 1-hexene and the linear low density polyethylene has a dart drop impact strength of greater than about 500 grams as measured by ASTM D 1709/A.
A polymer blend which comprises:
- (a) from about 60 wt % to about 75 wt % of a high molecular weight, high density polyethylene that has a density greater than about 0.94 g/cc and an MI2 less than about 0.1 dg/min;
- and
- (b) from about 25 wt % to about 40 wt % of a linear low density polyethylene that has a density within the range of about 0.91 to about 0.925 cc/g and an MI2 within the range of about 0.5 to about 5 dg/min, wherein the linear low density polyethylene is a copolymer of ethylene with 1-hexene and the linear low density polyethylene has a dart drop impact strength of greater than about 500 grams as measured by ASTM D1709/A.
Dependencies are inferred from the claim text.