Rheology-modified thermoplastic elastomer compositions for extruded profiles
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United States of America Patent
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Mar 4, 2008
Grant Date -
Jul 1, 2004
app pub date -
Sep 30, 2003
filing date -
Oct 1, 2002
priority date (Note) -
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Abstract
Rheology-modified, gel-free thermoplastic elastomer compositions comprising a melt blend of an ethylene/.alpha.-olefin polymer and a high melting polymer such as polypropylene or a propylene/.alpha.-olefin copolymer wherein the rheology modification is induced by a combination of a peroxide and a free radical coagent in a peroxide:coagent ratio of 1:4 to 1:20 and a maximum peroxide concentration of 0.075 wt %. The resulting compositions have an elastomeric phase, a non-elastomeric phase and certain physical properties that exceed those of a like composition that is rheology-modified by peroxide alone or peroxide and coagent in a 1:2 to 2:1 ratio. The compositions are used to make a variety of articles of manufacture, such as tubing and weatherstripping, via calendaring, extrusion, and molding techniques such as blow molding.
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