High molecular weight high density polyethylene with improved tear resistance
AssigneeExxon Chemical Patents Inc.
InventorsSteven A. Best, Thomas S. Daniluk
Life of this patent
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Abstract
Articles fabricated from certain high molecular weight high density polyethylenes (HMW-HDPE) combined with a second component, exhibit superior puncture propagation tear resistance and puncture propagation tear length. The second component may be an elastomer such as styrene-butadiene-styrene, styrene-isoprene-styrene, EPR, EPDM, butyl rubber, metallocene-catalyzed polyethylene, and combinations thereof. The second component or components will be present in a fabricated article from 1 to 15 weight percent. Articles include films, bags made from films, and extrusion blow-molded articles.
Claims7
A high molecular weight-high density polyethylene composition comprising:
- a) a first component present in the range of from about 85 to 99 weight percent, said first component is an high molecular weight-high density polyethylene said high molecular weight-high density polyethylene having;
- i) a density in the range of from about 0.940 to about 0.970 g/cc;
- ii) an alpha-olefin comonomer content up to about 2 mole percent based on the total moles of the high molecular weight-high density polyethylene;
- iii) melt index in the range of from about 0.02 to about 0.1 dg/min.;
- and
- b) in the range of from 1 to about 15 weight percent of a metallocene-catalyzed linear low density polyethylene,;
- and
- wherein a film made from said composition has a puncture propagation tear, (machine direction) above about 2 KgF, and a puncture propagation tear length, (machine direction) up to about 100 mm.
Dependencies are inferred from the claim text.