公开(公告)号：US20190119419A1

公开(公告)日：2019-04-25

申请号：US15739649

申请日：2016-06-23

Applicant: BOREALIS AG

Inventor： Alexandra Romina ALBUNIA ,  Ravindra TUPE ,  Victor SUMERIN ,  John JAMIESON ,  Jani AHO ,  Markku VAHTERI ,  Jarmo KELA ,  Renate ECKMAYR

IPC: C08F210/16 ,  C08F110/02 ,  C08F2/00 ,  C08F2/14 ,  C08F2/34 ,  C08F4/02

CPC classification number: C08F210/16 ,  C08F2/001 ,  C08F2/14 ,  C08F2/34 ,  C08F4/022 ,  C08F110/02 ,  C08F2410/01 ,  C08F2410/05 ,  C08F2500/08 ,  C08F2500/12 ,  C08F2800/20 ,  C08L23/06 ,  C08L23/0815

Abstract: A process for producing copolymers of ethylene and at least one alpha-olefin having from 4 to 10 carbon atoms in the presence of a solid Ziegler-Natta catalyst comprising of magnesium, titanium, halogen and an internal organic compound, the copolymer having a density of from 906 to 937 kg/m3 and a melt flow rate MFR21 measured at 190° C. under 21.6 kg load of from 3 to 150 g/10 min. The process includes the steps of (A) homopolymerising ethylene or copolymerising ethylene and a first alpha-olefin having from 4 to 10 carbon atoms in a first polymerisation stage in the presence of the polymerisation catalyst, hydrogen and optionally the first alpha-olefin; (B) copolymerising ethylene and a second alpha-olefin having from 4 to 10 carbon atoms in a second polymerisation stage in the presence of the first homo- or copolymer of ethylene and the Ziegler-Natta catalyst; and (C) recovering the polymer mixture.