METHOD FOR PRODUCING POLYESTER
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United States of America Patent
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Issued Date -
Aug 11, 2016
app pub date -
Sep 18, 2014
filing date -
Sep 20, 2013
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Abstract
The invention provides a method for producing polyester comprising:
- a step for preparing an oligomer comprising a dicarboxylic acid diester by an esterification reaction or a transesterification reaction between a dicarboxylic acid or an ester-forming derivative thereof and a glycol, and thena step for subjecting the oligomer to melt-polycondensation to provide polyester as melt-polycondensate,wherein at least in the step of subjecting the oligomer to melt-polycondensation of the two steps, the oligomer is subjected to melt-polycondensation in the presence of titanium nitride and, as a polycondensation catalyst, particles of a solid base having a coating layer of titanic acid on the surfaces, thereby to provide polyester as melt-polycondensate.
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