At least two-stage process for preparing propylene polymer compositions

US7816452B2 · kind B2 · utility

Assignee

• Basell Poliolefine Italia S.r.l. · IT

Inventors

• Ulrich Dahn · Mannheim, DE
• Wolfgang Bidell · Mutterstadt, DE
• Hans-Jurgen Zimmermann · Bensheim, DE
• Joachim Roesch · Ludwigshafen, DE
• Guenther Schweier · Friedelsheim, DE

Key dates

• Filing date: Jul 23, 2003
• Grant date: Oct 19, 2010
• Expiry date: May 20, 2024

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08L2308/00
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

The present invention relates to a process for preparing propylene polymer compositions in at least two-stage process wherein, in a first stage, a propylene homopolymer or a propylene copolymer comprising propylene and at least a CZ-CIO-1-alkenes other than propylene, containing at least 85% by weight of propylene, is prepared by polymerization and, in a second stage, ethylene and at least a comonomer selected from propylene and C4-C,o1alkenes are polymerized to give an ethylene polymer, comprising at least 90% by weight of ethylene, wherein the amount of the ethylene polymer in the propylene polymer composition ranges from 10 to 50% by weight and the propylene polymer composition has a melt flow rate MFR, in accordance with ISO 1133 at 230° C. and 2.16 kg, of from 2 to 50 g/10 min.