Method of processing a polycondensate in a multi-screw extruder
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United States of America Patent
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Jan 11, 2005
Grant Date -
Jan 8, 2004
app pub date -
May 2, 2003
filing date -
Nov 2, 2000
priority date (Note) -
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Abstract
A method for processing a polycondensate to give a granulate formed as pellets is disclosed, whereby the polycondensate is fused in the course of the method and then later resolidified. In an exemplary method, a total time during which the temperature of the polycondensate is above the melting point thereof is less than about 60 seconds. This method can be carried out by a multi-shaft extruder, whereby the degrassing and/or drying of the polycondensate in the solid state occurs at a pressure below atmospheric pressure and/or with addition of an inert gas. The time period, during which the polycondensate remains in the extruder, after being melted therein, amounts to, for example, less than about 15 seconds.
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