Borealis Ag

Dario Romano

Sanjay Rastogi

Esa Kokko

Irfan Saeed

Sara Ronca

Mika Salo

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

Process for the preparation of an UHMWPE homopolymer

A process for the preparation of an ultra-high molecular weight ethylene homopolymer having a MFRof 0.01 g/10 min or less, said process comprising: (I) prepolymerising at least ethylene at a temperature of 0 to 90&#xb0; 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&#xb0; C. or less, such as 20 to 55&#xb0; C., to prepare said UHMW ethylene homopolymer; wherein the UHMW ethylene homopolymer comprises up to 8 wt. % of said prepolymer.

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Maastricht, Netherlands

Dario Romano