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1. (WO2018219805) PROCESS FOR REMOVING VOLATILE COMPONENTS FROM AN OLEFIN POLYMER AND ARTICLE OBTAINED

Pub. No.:    WO/2018/219805    International Application No.:    PCT/EP2018/063781
Publication Date: Fri Dec 07 00:59:59 CET 2018 International Filing Date: Sat May 26 01:59:59 CEST 2018
IPC: B29C 47/92
B29C 47/76
B29B 9/06
B29C 47/30
B29C 47/60
B29C 47/40
Applicants: BOREALIS AG
Inventors: HRISTOV, Velichko
AL-HAJ ALI, Mohammad
Title: PROCESS FOR REMOVING VOLATILE COMPONENTS FROM AN OLEFIN POLYMER AND ARTICLE OBTAINED
Abstract:
The invention relates to a process for removal of volatile components from an olefin polymer, the process carried out in an extruder comprising at least one vacuum degassing zone, said process comprising the steps of: (a) introducing a stream of an olefin polymer into the extruder; (b) extruding the olefin polymer in the extruder at a temperature which is higher than the melting temperature of the olefin polymer but lower than the decomposition temperature of the olefin polymer, thereby producing an olefin polymer melt having reduced amount of volatile components, wherein the process in the extruder has a residence time distribution broadness (σ2) in the range of 800 to 4000 as define by equation (1) wherein: σ2 is the residence time distribution broadness, T is the mean residence time, t is the interval of residence time a fluid element of the olefin polymer spends in the extruder, E(t) is the residence time distribution function, and wherein the process optionally comprises a step (c) where the melt of the olefin polymer is passed through a die zone to a pelletizer for pelletizing the obtained olefin polymer.