Borealis Ag

Abu Dhabi Polymers Company Limited (Borouge) L.l.c.

Joy Cheng

Erik A Eriksson

Joseph Thorman

Ravindra Tupe

Floran Prades

Anh Tuan Tran

John Jamieson

Qizheng Dou

Alexandra Romina Albunia

Andrey Buryak

Luc Monnissen

Geir Johnsen

Mark Jeruzal

Christian Rein

Peter Roos

Qizheng Duo

Erik Eriksson

Geir Kristian Johnsen

The invention provides a process for the preparation of a multimodal high density polyethylene (HDPE) having a melt flow rate (MFR) 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 MFRfrom 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 MFRfrom 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.

Process for the preparation of multimodal high density polyethylene

A polymer composition and a process for the production of this composition comprising a base resin is disclosed herein. The base resin includes a very high molecular weight component, a low molecular weight component, and a high molecular weight component having a weight average molecular weight higher than the weight average molecular weight of the low molecular weight component but lower than the weight average molecular weight of the very high molecular weight component. An amount of the very high molecular weight component in the base resin is 0.5 to 8 wt %. The very high molecular weight component has a viscosity average molecular weight of greater than 1100 kg/mol. The composition has FRRof equal to or greater than 38, a melt flow rate MFRof equal to or greater than 6.5 g/10 min and a viscosity at a shear stress of 747 Pa (eta747) of 450 to 3000 kPas.

Composition and process

A multimodal polyethylene polymer having an MFRof 0.05 to 10.0 g/10 min, a density of 940 kg/mor more, a tensile modulus of 900 MPa or more wherein Formula (I).

Multimodal polyethylene polymers and methods of making and using the same

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Linz, Austria

Joy Cheng