Process for the production of high molecular weight polyester resins
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United States of America Patent
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Aug 2, 1994
Grant Date -
N/A
app pub date -
Nov 25, 1992
filing date -
Mar 29, 1991
priority date (Note) -
Expired
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Abstract
A process for the solid state polyaddition of a polyester resin in which the resin, blended in a molten state with a dianhydride of an aromatic tetracarboxylic acid is granulated, crystallized and then upgraded, characterized in that the crystallization and upgrading temperature is comprised in the range between the TG and 170.degree. C., preferably between 130.degree. and 170.degree. C.
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