Polyesters
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United States of America Patent
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May 26, 1998
Grant Date -
N/A
app pub date -
Jan 7, 1997
filing date -
May 10, 1994
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A process of producing a cyclic polyester oligomer mixture using a solid support system is described. A preferred cyclic polyester mixture contains at least one cyclic polyester oligomer containing 15 or more repeat units. Cyclic ethylene terephthalate oligomers are particularly preferred. The cyclic polyester oligomers may be converted to high molecular weight linear polyesters by heating in the presence of a catalyst.
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