Polyester synthesis using catalysts having low decomposition temperatures
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United States of America Patent
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Mar 9, 1999
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N/A
app pub date -
Jun 18, 1997
filing date -
Jun 18, 1997
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Expired
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Abstract
An improved two-stage process for the preparation of polyester resins is provided which involves an initial reaction of a dicarboxylic acid such as isophthalic acid with an alkylene oxide such as ethylene or propylene oxide in the presence of a catalyst to form an oligoester reaction mixture, followed by a second stage reaction between the oligoester reaction mixture and a dibasic acid or anhydride; a first-stage catalyst is employed which has a thermal decomposition temperature substantially at or below the second-stage reaction temperature. The most preferred first-stage catalyst is benzyltriethylammonium chloride.
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