Methods of making multiphase elongate polymeric extrudates by directing additives into a cross-sectional location thereof
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United States of America Patent
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May 21, 2002
Grant Date -
Apr 12, 2001
app pub date -
Dec 8, 2000
filing date -
Dec 4, 1998
priority date (Note) -
Expired
status (Latency Note)
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Abstract
This invention provides an apparatus and method for injecting an additive directly into a polymer melt stream. The method comprises supplying a melt flow of a polymeric host material to a die assembly having a thin-plate assembly and injecting at least one additive into at least one predetermined location in a cross-section of the melt flow of the polymeric host material while the melt flow passes through the die assembly. The method achieves uniform dosing of the one or more additives in the extrusion direction in the polymeric host material without homogeneously mixing the one or more additives and the polymeric host material. The apparatus for directly injecting one or more additives into a polymer melt stream comprises a pumping system, a die assembly having a thin-plate assembly, and a distribution line.
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