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:
May. 05, 2015
Filed:
Feb. 26, 2014
Basell Polyolefine Gmbh, Wesseling, DE;
Harilaos Mavridis, Lebanon, OH (US);
Gerhardus Meier, Frankfurt am Main, DE;
Ulf Schueller, Frankfurt am Main, DE;
Diana Doetsch, Bad Kreuznach, DE;
Bernd Marczinke, Römerberg, DE;
Iakovos Vittorias, Mainz, DE;
Basell Polyolefine GmbH, Wesseling, DE;
Abstract
Embodiments of the present disclosure relate to a method of preparing polyethylene compositions comprising polymerizing ethylene in a first gas-phase reactor and polymerizing ethylene in a second gas-phase reactor in the presence of hydrogen; wherein at least one of the first or second gas-phase reactors comprises a first and second polymerization zone; wherein a hydrogen pressure of the first and second polymerization zones are different such that at least a portion of the second ethylene cycles through the first and second polymerization zones and a gas mixture of each polymerization zone is partially or totally prevented from entering the other zone.