Method for increasing the molecular weight of polyester resins
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United States of America Patent
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May 14, 2002
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N/A
app pub date -
Sep 13, 2000
filing date -
Dec 1, 1997
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Expired
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Abstract
A method for increasing the molecular weight of aliphatic polyester resins from dicarboxylic aliphatic acids having 2-22 carbon atoms, or from hydroxy-acids having 2-22 carbon atoms, in which the solid resin is brought into contact with a chain extender preferably chosen from the organic disocyaciates.
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