Process for the processing of a thermoplastic polycondensation polymer
AssigneeStamicarbon B.V.
InventorsRudolf J. H. Burlet, Jozef M. H. Lemmens
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Abstract
The invention relates to a process for the processing of a thermoplastic polycondensation polymer by supplying the polymer in finely distributed form to a first vented extruder in which the polymer is devolatilized at a temperature below its melting temperature. The polymer is then placed in a second extruder where the polymer is transported below the melting temperature of the polymer over a first length of the screw from the inlet of the extruder, with constant evacuation of volatile components by means of a vacuum exhausting device at a vacuum of less than 10 mbar and the polymer is compressed and melted over a second length of the screw and then leaves the extruder as an end product of a semimanufacture.
Claims10
A process for the processing of a thermoplastic polycondensation polymer, said process comprising:
- (a) supplying polymer particles with a size of less than 2,000 .mu.m to a first vented extruder in which said polymer is devolatilized and homogenized by means of transporting said polymer through said extruder at a temperature below the melting temperature of said polymer with constant evacuation of volatile components at a vacuum of less than 10 mbar;
- (b) supplying said polymer to a second vented extruder in which said polymer is devolatilized by means of transporting said polymer over a first length of a screw at a temperature below the melting temperature of said polymer with constant evacuation of volatile components at a vacuum of less than 10 mbar;
- and
- (c) compressing and melting said polymer over a second length of said screw of said second extruder, with said polymer exiting said second extruder as an end product or semi-manufacture,
- wherein, said second screw length of said second extruder is equal to 1-10 times the diameter and wherein the total length of said first and second extruders screw path is equal to 20-45 times the diameter.
Dependencies are inferred from the claim text.