Method for thermally processing polyester pellets
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United States of America Patent
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Jul 2, 1996
Grant Date -
N/A
app pub date -
Apr 26, 1995
filing date -
Apr 26, 1995
priority date (Note) -
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Abstract
A method for thermally processing polyester pellets by crystallization and polymerization in the solid state which comprises providing a confined processing unit. The pellets are introduced to said unit along with a liquid medium. The combination of pellets and liquid medium is agitated to achieve mixing and the temperature of the agitated mixture is controlled to achieve treating of the polyester pellets in the agitated heating liquid medium at a temperature slightly below the sticking temperature of the polyester. The treatment is continued for a period sufficient to substantially increase the crystallinity and molecular weight of the polyester.
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