公开(公告)号：US3925341A

公开(公告)日：1975-12-09

申请号：US41906073

申请日：1973-11-26

Applicant: BASF AG

Inventor： MUELLER-TAMM HEINZ ,  SCHICK HANNES ,  RAU WOLFGANG ,  HENNENBERGER PETER

IPC: C08F6/00 ,  B29B9/00 ,  B29B9/06 ,  B29B9/16 ,  C08F6/02 ,  C08F6/06 ,  C08F8/00 ,  C08F6/28

CPC classification number: C08F6/02 ,  C08F8/00 ,  C08L23/02 ,  C08F10/00

Abstract: A process for working up particulate polyolefins obtained by polymerization carried out with the aid of Ziegler/Natta catalysts. The process of the invention is characterized by a continuous, conventional operation (1) comprising the following integrated sub-stages: (1.1) introducing particulate polyolefin to a melting zone, (1.2) passing the molten polyolefin to a degassing zone, (1.3) transferring the degassed polyolefin to a discharge zone, and (1.4) finally extruding and granulating the resulting polyolefin; and by an important, additional and new feature (2) comprising the addition of an alkenoxide, water and optionally nitrogen to the polyolefin immediately before it passes to the melting zone or while it is in the melting zone. This process makes it possible to produce granular polyolefins of low halogen content in a particularly simple manner.