Preparation of homopolymers and copolymers of propylene by means of a Ziegler-Natta catalyst system

US4745164A · kind A · utility

Assignee

• BASF SE

Inventors

• Guenther Schweier · Friedelsheim, DE
• James F. R. Jaggard · Ludwigshafen, DE
• Rainer A. Werner · Annaberg-Buchholz, DE
• Wolfgang Gruber · Bischofswerda, DE

Key dates

• Filing date: Nov 14, 1986
• Grant date: May 17, 1988
• Expiry date: Nov 14, 2006

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10S526/901
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

Polymers of propylene are prepared by means of a Ziegler-Natta catalyst system comprising (1) a titanium component which contains titanium, magnesium, chlorine and a benzenecarboxylic acid derivative, (2) an aluminum component and (3) a silane component, wherein the (1) used is obtained by (1.1) first reacting with one another (1.1.1) in a liquid hydrocarbon, (1.1.2) a finely divided magnesium halide, (1.1.3) an alkanol, (1.1.4) a phthalic acid ester and (1.1.5) titanium tetrachloride under certain conditions, (1.2) then extracting the solid intermediate obtained from (1.1) with a liquid alkylbenzene until the remaining solid substance has become significantly richer in magnesium, and (1.3) finally washing the solid substance remaining in (1.2) with an alkane in a certain manner.