Process for the polymerization of ethylene, and ethylene polymers having broad molecular weight distribution and long-chain branching

US8759460B2 · kind B2 · utility

Assignee

• Bassell Polyolefine GmbH · DE

Inventors

• Eleonora Ciaccia · Ferrara, IT
• Iakovos Vittorias · Mainz, DE
• Shahram Mihan · Bad Soden, DE
• Lenka Lukesova · Hofheim, DE
• Dieter Lilge · Schifferstadt, DE
• Maclovio Herrera Salinas · Frankfurt, DE
• Gerhardus Meier · Frankfurt, DE
• Gerd Mannebach · Münstermaifeld, DE

Key dates

• Filing date: Nov 30, 2009
• Grant date: Jun 24, 2014
• Expiry date: Jul 15, 2030

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08F2410/04
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

New ethylene polymers having broad molecular weight distribution and long-chain branching, above all at high molecular weight fractions; the polymers have strain hardening equal or higher than 1.4 (at constant elongational rate of 0.5 s−1, at 150° C.), branching index g′ equal or lower than 0.9 (at Mw of 2·106 g/mol). The polymers are prepared by using a mixed catalyst system comprising a polymerization catalyst based on a late transition metal component having a tridentate ligand, and a Ziegler polymerization catalyst annealed at a temperature higher than 100° C., for a time of at least 10 minutes.