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:
Sep. 27, 2005
Filed:
May. 14, 2004
Lars Wittkowski, Mannheim, DE;
Andreas Deckers, Flomborn, DE;
Wilhelm Weber, Neustadt, DE;
Thomas Dröge, Neustadt, DE;
Andrei Gonioukh, Liblar, DE;
Frank-olaf Mähling, Mannheim, DE;
Lars Wittkowski, Mannheim, DE;
Andreas Deckers, Flomborn, DE;
Wilhelm Weber, Neustadt, DE;
Thomas Dröge, Neustadt, DE;
Andrei Gonioukh, Liblar, DE;
Frank-Olaf Mähling, Mannheim, DE;
Basell Polyolefine GmbH, Wesseling, DE;
Abstract
A process for preparing ethylene polymers by the high-pressure method comprises dissolving one or more free-radical initiators in one or more ketones of the formula Iwhere Rand Rare identical or different and are selected from among C-C-alkyl and C-C-cycloalkyl and Rand Rmay also be covalently linked to one another to form a 4- to 13-membered ring, prior to the polymerization,compressing the solution, metering it into the polymerization reactor at one or more points and subsequently carrying out the polymerization at from 150 to 380° C. and from 500 to 4500 bar.