Zieger-natta-type catalyst systems

US5166113A · kind A · utility

Inventors

• Harald Schwager · Speyer, DE
• Peter Koelle · Ludwigshafen, DE
• Juergen Kerth · Eisenberg (Pfalz), DE
• Ralf Zolk · Bad Dürkheim, DE

Key dates

• Filing date: Sep 17, 1991
• Grant date: Nov 24, 1992
• Expiry date: Sep 17, 2011

Classification

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

Abstract

Ziegler-Natta-type catalyst systems containing, as active constituents, PA1 a) a titanium-containing solid component which also contains magnesium, halogen and a carboxylic acid ester, and, as cocatalyst, PA1 b) an aluminum compound, wherein the carboxylic acid ester in the solid component is a diester of a carboxylic acid of the formula Ia or Ib ##STR1## where R.sup.1, R.sup.2, R.sup.3 and R.sup.4 are identical or different and are hydrogen, C.sub.1 - to C.sub.15 -alkyl, C.sub.7 - to C.sub.15 -alkylaryl, or 5- to 7-membered cycloalkyl, which may itself carry C.sub.1 - to C.sub.10 -alkyl groups, are particularly suitable for the preparation of polypropylene and copolymers of propylene containing minor amounts of other .alpha.,.beta.-unsaturated olefinic compounds having from 2 to 12 carbon atoms.