Purification of macrocyclic oligoesters
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United States of America Patent
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Nov 8, 2005
Grant Date -
Sep 30, 2004
app pub date -
Dec 19, 2003
filing date -
Dec 20, 2002
priority date (Note) -
Expired
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Abstract
Acid impurities, such as carboxylic acid-terminated polymers, are removed from macrocyclic oligoesters with ion exchange resins, resulting in macrocyclic oligoesters that are substantially free of acid impurities. The ion exchange resins can be regenerated anew and reused by washing the resins with various wash solutions. Macrocyclic oligoesters substantially free of acid impurities polymerize to much higher molecular weight polyesters than macrocyclic oligoesters containing acid impurities.
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