公开(公告)号：US20210340289A1

公开(公告)日：2021-11-04

申请号：US17261317

申请日：2019-07-18

Applicant: BOREALIS AG

Inventor： Irfan SAEED ,  Esa KOKKO ,  Mika SALO ,  Sanjay RASTOGI ,  Dario ROMANO ,  Sara RONCA

IPC: C08F4/649 ,  C08F110/02 ,  C08L23/06 ,  C08F4/02 ,  C08F4/654 ,  C08F4/655

Abstract: A process for the preparation of an ultra-high molecular weight ethylene homopolymer having a MFR21 of 0.01 g/10 min or less, said process comprising: (I) prepolymerising at least ethylene at a temperature of 0 to 90° C. in the presence of a heterogeneous Ziegler Natta catalyst to prepare an ethylene prepolymer having an Mw of 40,000 to 600,000 g/mol; and thereafter in the presence of the prepolymer and said catalyst; (II) polymerising ethylene at a temperature of 55° C. or less, such as 20 to 55° C., to prepare said UHMW ethylene homopolymer; wherein the UHMW ethylene homopolymer comprises up to 8 wt. % of said prepolymer.

公开(公告)号：US20230322969A1

公开(公告)日：2023-10-12

申请号：US18111025

申请日：2023-02-17

Applicant: BOREALIS AG

Inventor： Irfan SAEED ,  Esa KOKKO ,  Mika SALO ,  Sanjay RASTOGI ,  Dario ROMANO ,  Sara RONCA

IPC: C08F110/02 ,  C08F2/00 ,  C08L23/06

CPC classification number: C08F110/02 ,  C08F2/001 ,  C08L23/06 ,  C08F2500/34 ,  C08F2500/35 ,  C08L2207/068 ,  C08L2314/02

Abstract: A process for the preparation of an ultra-high molecular weight ethylene homopolymer having a MFR21 of 0.01 g/10 min or less, said process comprising:

(I) prepolymerising at least ethylene at a temperature of 0 to 90° C. in the presence of a heterogeneous Ziegler Natta catalyst to prepare an ethylene prepolymer having an Mw of 40,000 to 600,000 g/mol; and thereafter in the presence of the prepolymer and said catalyst;
(II) polymerising ethylene at a temperature of 55° C. or less, such as 20 to 55° C., to prepare said UHMW ethylene homopolymer; wherein the UHMW ethylene homopolymer comprises up to 8 wt.% of said prepolymer.