Process for the preparation of an olefin polymer

US5329033A · kind A · utility

Assignee

• Hoechst GmbH · DE

Inventors

• Walter Spaleck · Bocholt, DE
• Jurgen Rohrmann · Kelkheim, DE
• Martin Antberg · Frankfurt am Main, DE

Key dates

• Filing date: Oct 25, 1993
• Grant date: Jul 12, 1994
• Expiry date: Oct 25, 2013

Classification

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

Abstract

A very effective catalyst system for olefin polymerization consists of a cocatalyst, preferably an aluminoxane, and a metallocene of the formula (I) ##STR1## in which, preferably, M.sup.1 is Zr, R.sup.1 and R.sup.2 are alkyl or halogen, R.sup.3 to R.sup.6 are alkyl, --(CR.sup.8 R.sup.9).sub.m --R.sup.7 --(CR.sup.8 R.sup.9).sub.n -- is a chain having one or more members, in which R.sup.7 can also be a (substituted) hetero atom, and m+n is zero or 1. The catalyst system leads to polymers of variable molecular weight and stereotacticity, depending on the substituents R.sup.3 to R.sup.6 chosen, at polymerization temperatures which are relevant in industry.