Metallocenes and process for the preparation of metallocenes

US6175026A · kind A · utility

Assignee

• Solvay Polyolefins Europe-Belgium (Societe Anonyme) · US

Inventors

• John J. Eisch · Vestal, US
• Yun Qian · Doylestown, US
• Jurgen Weber · Oberhausen, DE
• Nicola Zandona · Waterloo, BE
• Fabian Siberdt · Brussels, BE

Key dates

• Filing date: Apr 6, 2000
• Grant date: Jan 16, 2001
• Expiry date: Apr 6, 2020

Classification

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

Abstract

A metallocene corresponding to the formula ##STR1## wherein M is a group 4 transition metal, PA1 each Y is, independently, selected from the group of halogen, hydrocarbyl and hydrocarbyloxy, PA1 R.sup.1, R.sup.4 are, independently, selected from the group of hydrogen, hydrocarbyl, hydrocarbyloxy, PA1 R.sup.2, R.sup.3, R.sup.5, R.sup.6, R.sup.7, R.sup.8 are, independently, selected from the group of hydrogen, hydrocarbyl, hydrocarbyloxy, with the provision that, respectively, R.sup.2 and R.sup.3, R.sup.5 and R.sup.6, R.sup.7 and R.sup.8 can be linked to each other. A process for the preparation of metallocenes comprising the following steps: PA1 (a) contacting, in a solvent, a transition metal halide of formula MX.sub.4 with an organometallic compound of formula M'R.sub.m, wherein M is a group 4 transition metal, X is a halogen, M' is an element chosen from the groups 1, 2 and 13 of the periodic table, R is hydrogen, an alkyl, aryl, alkenyl or alkynyl group containing up to 20 carbon atoms, m=1 when M' is a group 1 element, m=2 when M' is a group 2 element, m=3 when M' is a group 13 element, in order to reduce M, which leads to a subvalent transition metal halide, (b) purifying the …