Polyesters production process
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United States of America Patent
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Feb 4, 1997
Issued Date -
N/A
app pub date -
Apr 16, 1996
filing date -
Oct 18, 1993
priority date (Note) -
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Abstract
An atmospheric pressure process for the continuous production of polyester is disclosed wherein a melt of bis(3-hydroxy propyl) terephthalate, or its low molecular oligomers, obtained by esterifying terephthalic acid or transesterifying dimethyl terephthalate with propylene glycol, is intimately contacted with an inert gas to facilitate polymerization and removal of the reaction byproducts. The propylene glycol evolved and the inert gas are recycled.
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