Process for the production of high molecular weight polyester resins
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United States of America Patent
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Aug 16, 1994
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N/A
app pub date -
Dec 28, 1992
filing date -
Mar 29, 1991
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Abstract
A process for the solid state upgrading of a polyester resin by polyaddition reaction in which the resin is upgraded in the presence of an upgrading additive which is a compound different from a dianhydride of an aromatic tetracarboxylic acid, containing two groups capable of addition reactions with the terminal groups of the polyester, selected for example in the group of the dianhydrides of aliphatic and cycloaliphatic tetracarboxylic acids.
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