METHODS FOR CONVERTING LINEAR POLYESTERS TO MACROCYCLIC OLIGOESTER COMPOSITIONS AND MACROCYCLIC OLIGOESTERS
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United States of America Patent
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Issued Date -
Sep 4, 2008
app pub date -
Dec 17, 2007
filing date -
Sep 1, 2000
priority date (Note) -
Abandoned
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Abstract
Macrocyclic oligoesters and compositions comprising macrocyclic oligoesters are prepared from intermediate molecular weight polyesters. In one embodiment, a diol is contacted with a dicarboxylic acid or a dicarboxylate in the presence of a catalyst to produce a composition comprising a hydroxyalkyl-terminated polyester oligomer. The hydroxyalkyl-terminated polyester oligomer is heated to produce a composition comprising an intermediate molecular weight polyester which preferably has a molecular weight between about 20,000 Daltons and about 70,000 Daltons. The intermediate molecular weight polyester is heated and a solvent is added prior to or during the heating process to produce a composition comprising a macrocyclic oligoester. An optional step is to separate the macrocyclic oligoester from the composition comprising the macrocyclic oligoester.
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