Process for the preparation of polyolefins having a broad molecular weight distribution

US5350817A · kind A · utility

Assignee

• Hoechst GmbH · DE

Inventors

• Andreas Winter · Königstein, DE
• Volker Dolle · Kelkheim, DE
• Walter Spaleck · Bocholt, DE

Key dates

• Filing date: Sep 10, 1993
• Grant date: Sep 27, 1994
• Expiry date: Sep 10, 2013

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10S526/943
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

Polyolefins having a molecular weight distribution M.sub.w /M.sub.n of .gtoreq.3 and which may be monomodal, bimodal or multimodal are obtained by polymerization or copolymerization of olefins of the formula RCH.dbd.CHR, in which a catalyst system comprising an aluminoxane and a transition-metal component (metallocene) is used, the transition-metal component comprising at least one zirconocene of the formula I ##STR1## and at least one zirconocene of the formula Ia or alternatively at least 2 zirconocenes of the formula I.