High melt strength polypropylene resins and method for making same
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United States of America Patent
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Issued Date -
Jan 4, 2007
app pub date -
Jul 1, 2005
filing date -
Jul 1, 2005
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Abandoned
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Abstract
The melt strength of an unmodified semi-crystalline polypropylene resin may be increased via thermally reversible ionic bonds and long chain branches formed by the addition of a sufficient amount of at least one peroxygenated polyolefin and a sufficient amount of at least one metallic coupling agent. The peroxide content of the peroxygenated polyolefin ranges from about 1 mmol to 200 mmol total peroxide per kilogram of polymer. The metallic coupling agent is typically at least one metallic salt of alpha, beta-unsaturated carboxylic acids or alpha, beta-unsaturated carboxylic acids where the acid group has been neutralized.
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