Method for improving compression set in thermoplastic vulcanizates
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United States of America Patent
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Mar 17, 2009
Grant Date -
Oct 18, 2007
app pub date -
Apr 12, 2006
filing date -
Apr 12, 2006
priority date (Note) -
Expired
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Abstract
The compression set [(70° C., 22 hr), (100° C., 22 hr)] of TPVs can be improved by substituting, within their respective constituent plastic phase, all or portions of polyolefins having a high melting point, with polyolefins having lower melting point (Tm from between 115° C. to 140° C.). Exemplary polyolefins having melting points in this range include homopolyethylene, syndiotactic polypropylene, and isotactic poly(1-butene). Composition and methods of formulating thermoplastic vulcanizates to achieve an improved high temperature (between 70° C. 100° C.) compression set by selecting between suitable polyolefins on the basis of melting point temperature and substituting from 30% to 100% of high melting point polyolefins with low melting point polyolefins in the plastic phase are taught.
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