Process for the preparation of an olefin polymer

US5278264A · 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: Aug 24, 1992
• Grant date: Jan 11, 1994
• Expiry date: Aug 24, 2012

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.