High-purity polymer granules and method for the production thereof
AssigneesBayer Aktiengesellschaft, Bayer Antwerpen N.V.
InventorsThomas Elsner, Jürgen Heuser, Christian Kords, Steffen Kühling, Paul Viroux
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Abstract
A process for producing polymer pellets is disclosed. The process that is particular suitable for making polycarbonate pellets entails extruding a polymer melt, cooling the extrudate by contacting it with a cooling fluid and pelletizing the solidified polymer. The process is characterized in that the cooling fluid has a solids particle content of at most 10 ppm.
Claims12
A process for producing polymer pellets, in particular polycarbonate pellets, from polymer melts, in particular polycarbonate melts, by melt extruding the polymer, cooling the melt in a cooling fluid and pelletizing the solidified polymer, characterised in that the cooling air or ambient air coming into contact with the polymer exhibits a solids particle content of at most 10 ppm, preferably at most 5 ppm, particularly preferably at most 0.5 ppm, wherein the prccess is carried out in an enclosed room under excess pressure in relation to the surroundings.
A process for producing polymer pellets comprising extruding a ploymer melt, solidifying the extrudate by contacting it with a cooling fluid to obtain a solidified polymer and pelletzing the solidified polymer, wherein cooling fluid contains particles at a concentration of at most 10 ppm, wherein the process is carried out in a closed room under excess pressure in relation to the surroundings.
Dependencies are inferred from the claim text.