PROCESSES FOR REDUCING ACID CONTENT OF A POLYALKYLENE TEREPHTHALATE AND USING SUCH IN THE PRODUCTION OF MACROCYCLIC POLYESTER OLIGOMER
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United States of America Patent
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Issued Date -
May 28, 2009
app pub date -
Oct 23, 2008
filing date -
Oct 23, 2007
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Abandoned
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Abstract
The invention relates to a method for producing low-acid polyalkylene terephthalate from which MPO can be advantageously manufactured. In certain embodiments, the acid content of commercially available polybutylene terephthalate (PBT) is reduced by adding a small amount of 1,4-butane diol (BDO) to a solution of the commercially available PBT in refluxing ortho-dichlorobenzene (oDCB) solvent.
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