Process for the preparation of an olefin polymer using metallocenes having specifically substituted indenyl ligands

US5304614A · kind A · utility

Assignee

• Hoechst GmbH · DE

Inventors

• Andreas Winter · Königstein, DE
• Martin Antberg · Frankfurt am Main, DE
• Volker Dolle · Kelkheim, DE
• Jurgen Rohrmann · Kelkheim, DE
• Walter Spaleck · Bocholt, DE

Key dates

• Filing date: Oct 14, 1992
• Grant date: Apr 19, 1994
• Expiry date: Oct 14, 2012

Classification

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

Abstract

A very active catalyst system for olefin polymerization comprises a cocatalyst, preferably an aluminoxane, and a metallocene of the formula I or Ia ##STR1## in which, preferably, M.sup.1 is Zr or Hf, R.sup.1 and R.sup.2 are alkyl or halogen, R.sup.3 and R.sup.4 are hydrogen or alkyl, R.sup.5 and 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 with one or more members, in which R.sup.7 can also be a (substituted) heteroatom, and m+n is zero or 1.