Ziegler-Natta catalyst systems modified during their preparation

US6156691A · kind A · utility

Assignee

• BASF SE

Inventors

• Stephan Huffer · Birkenfeld, DE
• Ulrich Moll · Schnaittach, DE
• Ian David McKenzie · Schöneiche bei Berlin, DE
• Franz Langhauser · Bad Dürkheim, DE
• Peter Kölle · Bad Dürkheim, DE
• Roland Hingmann · Ladenburg, DE
• Gunther Schweier · Osthofen, DE
• Rainer Hemmerich · Havelsee, DE
• Jurgen Kerth · Eisenberg (Pfalz), DE

Key dates

• Filing date: Sep 12, 1997
• Grant date: Dec 5, 2000
• Expiry date: Sep 12, 2017

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08F10/00
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

In catalyst systems of the Ziegler-Natta type modified during their preparation and comprising as active constituents PA0 a) a titanium-containing solid component which is obtained by reacting a compound of titanium with a compound of magnesium, a halogen, an inorganic oxide as support, a C.sub.1 -C.sub.8 -alkanol and a carboxylic ester as electron donor compound, and also as cocatalyst PA0 b) an aluminum compound and PA0 c) if desired, a further electron donor compound, the titanium-containing solid component a) is prepared by first, in a first stage, admixing an inorganic oxide as support with a solution of a chlorine-free compound of magnesium in an inert solvent, stirring this mixture for from 0.5 to 5 hours at from 10 to 120.degree. C. and subsequently reacting it while stirring continually in an inert solvent with a C.sub.1 -C.sub.8 -alkanol in an at least 1.3-fold excess, based on the compound of magnesium, to give a chlorine-free intermediate, then, without purification or extraction of the intermediate, adding a compound of trivalent or tetravalent titanium and a carboxylic ester as electron donor compound to this intermediate, stirring the resulting mixture for at least 3…