Preparation of low-acid polyalkylene terephthalate and preparation of macrocyclic polyester oligomer therefrom
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United States of America Patent
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Aug 3, 2010
Grant Date -
Oct 19, 2006
app pub date -
Mar 24, 2006
filing date -
Sep 1, 2000
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Expired
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Abstract
The invention provides methods and systems for manufacturing low-acid polyalkylene terephthalate, for example, polybutylene terephthalate (PBT). The invention also provides methods and systems for preparing macrocyclic polyester oligomer (MPO) from low-acid polyalkylene terephthalate. Finally, the invention provides methods and systems for preparing MPO via reaction of a diol and a dialkyl ester in an organic solvent to form non-isolated, low-acid polyalkylene terephthalate which undergoes cyclization (depolymerization) to form MPO.
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