The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jun. 20, 2023
Filed:
Jul. 18, 2019
Borealis Ag, Vienna, AT;
Irfan Saeed, Porvoo, FI;
Esa Kokko, Porvoo, FI;
Mika Salo, Porvoo, FI;
Sanjay Rastogi, Eindhoven, NL;
Dario Romano, Maastricht, NL;
Sara Ronca, Leicestershire, GB;
BOREALIS AG, Vienna, AT;
Abstract
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° 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.