Method of processing a polycondensate in a multi-screw extruder

Details Method of processing a polycondensate in a multi-screw extruder Method of processing a polycondensate in a multi-screw extruder

2005-01-11

2005-01-11

Boykin, Terressa (Department: 1711)

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Treating polymer containing material or treating a solid...

C264S176100, C264S219000, C528S480000, C528S481000

Reexamination Certificate

active

06841656

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.

REFERENCES:
patent: 5242993 (1993-09-01), Hergenrother et al.
patent: 5334669 (1994-08-01), Ghisolfi
patent: 0 336 520 (1989-10-01), None
patent: 5-42533 (1993-02-01), None
patent: WO0032377 (2000-06-01), None

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