公开(公告)号：US11965052B2

公开(公告)日：2024-04-23

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 ,  C08F4/02 ,  C08F4/649 ,  C08F4/654 ,  C08F4/655 ,  C08L23/06

CPC classification number: C08F4/6492 ,  C08F2/001 ,  C08F4/025 ,  C08F4/6546 ,  C08F4/6555 ,  C08F110/02 ,  C08L23/06 ,  C08F2500/01 ,  C08F2500/12 ,  C08F2500/26 ,  C08F2500/34 ,  C08F2500/35 ,  C08L2203/16 ,  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.

公开(公告)号：US11680114B2

公开(公告)日：2023-06-20

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

CPC classification number: C08F4/6492 ,  C08F4/025 ,  C08F4/6546 ,  C08F4/6555 ,  C08F110/02 ,  C08L23/06 ,  C08F2500/01 ,  C08F2500/12 ,  C08F2500/26 ,  C08F2500/34 ,  C08F2500/35 ,  C08L2203/16 ,  C08L2207/068

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.