Extrusion expansion of low molecular weight polyalkylene terephthalate for production of expanded beads
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United States of America Patent
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Nov 3, 2015
Grant Date -
Mar 7, 2013
app pub date -
Sep 6, 2012
filing date -
Sep 7, 2011
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Abstract
An extrusion expansion of low molecular weight polyalkylene terephthalates having an IV of below 1.0 dl/g to produce gas-charged beads is disclosed. The process includes an extrusion expanding of the resins and an underwater pelletizing of the melt threads. The obtained beads show a composite structure and are characterized by an IV of 0.69 dl/g or more and a melt viscosity η0 of higher than 300 Pa·s.
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