Thermoplastic elastomer compositions rheology-modified using peroxides and free radical coagents
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United States of America Patent
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Aug 10, 2004
Grant Date -
Aug 21, 2003
app pub date -
Feb 10, 2003
filing date -
Sep 22, 2000
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Abstract
Rheology-modified 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. 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. The compositions can be used to make a variety of articles of manufacture, such as automotive instrument panel skins, via calendaring and thermoforming procedures.
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