Process for pelleting ultra-high molecular weight polyethylene
AssigneeHoechst Aktiengesellschaft
InventorsWolfgang Payer, Maher Onallan, Winfried Materne, Andreas Sobbe
Life of this patent
Estimating the term…
Abstract
Pulverulent ultra-high molecular weight polyethylene, alone or as a mixture with other polyethylenes, is compacted into extrudates by extrusion agglomeration under pressure at temperatures of 100.degree. to 150.degree. C. over average residence times in the die of 2 to 40 seconds and at a compression ratio of 1:5 to 1:15, and the extrudates are divided into pellets.
Claims5
A process for pelletizing ultra-high molecular weight polyethylene comprising the steps of compacting a pulverulent material selected from the group consisting of ultra-high molecular weight polyethylene and mixtures thereof with other lower molecular weight polyethylenes by extrusion agglomeration in a die under pressure at temperatures of 100.degree. to 150.degree. C. over average residence times in the die of 2 to 40 seconds and at a compression ratio of 1:5 to 115 to obtain product extrudates, and dividing the product extrudates emerging from the die into pellets of the desired length.
Dependencies are inferred from the claim text.