Process for the preparation of a polypropylene

US5100981A · kind A · utility

Assignee

• Hoechst GmbH · DE

Inventors

• Michael Schreck · Frankfurt, DE
• Volker Dolle · Kelkheim, DE

Key dates

• Filing date: Jun 7, 1989
• Grant date: Mar 31, 1992
• Expiry date: Jun 7, 2009

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y02P20/52
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

In the process according to the invention for the preparation of a polypropylene, a catalyst system is used which is based on the product of the reaction of a magnesium halide with an electron donor and a tetravalent titanium compound, a halogen-free organoaluminum compound and two different organosilicon compounds as stereo-regulator. Propylene homopolymers and copolymers having a very narrow molecular weight distribution and high isotacticity are obtained in high yields. The polymers are suitable, in particular, for injection molding.