公开(公告)号：US20210147660A1

公开(公告)日：2021-05-20

申请号：US17056855

申请日：2019-05-30

Applicant: BOREALIS AG

Inventor： Anh Tuan TRAN ,  Alexandra Romina ALBUNIA ,  Joy Jie CHENG ,  Joseph THORMAN ,  John JAMIESON ,  Ravindra TUPE

IPC: C08L23/06 ,  C08F210/02 ,  C08F210/08 ,  C08F2/00 ,  C08F2/34 ,  B29C45/00 ,  B29C43/00

Abstract: The invention provides a process for the preparation of a multimodal high density polyethylene (HDPE) having a melt flow rate (MFR2) of 0.1 to 4.0 g/10 min, said process comprising: (i) polymerising ethylene in a first polymerisation stage in the presence of a Ziegler-Natta catalyst to prepare a first ethylene homopolymer having a MFR2 from 10 to 500 g/10 min; (ii) polymerising ethylene in a second polymerisation stage in the presence of said catalyst and said first ethylene homopolymer to prepare an ethylene homopolymer mixture comprising said first ethylene homopolymer and a second ethylene homopolymer, said mixture having a MFR2 from 50 to 1000 g/10 min; and (iii) polymerising ethylene and at least one alpha-olefin comonomer in a third polymerisation stage in the presence of said catalyst and said ethylene homopolymer mixture to prepare said multimodal HDPE.

公开(公告)号：US20170260312A1

公开(公告)日：2017-09-14

申请号：US15510624

申请日：2015-09-11

Applicant: BOREALIS AG

Inventor： Ricardo GODOY-LOPEZ ,  Floran PRADES ,  Anh Tuan TRAN

IPC: C08F255/02

CPC classification number: C08F255/02 ,  C08F2800/20 ,  C08F222/06

Abstract: The present invention provides a process of producing a modified polymer composition, which composition comprises a free-radical polymeriseable monomer grafted to a polyolefin backbone. The process comprises contacting, in an extruder, an olefin polymer and the free-radical polymeriseable monomer in the presence of a stable radical in an extruder and extruding the composition.