Catalyst systems of the Ziegler-Natta type

US6524995B2 · kind B2 · utility

Assignee

• Basell Polypropylen GmbH · DE

Inventors

• Wolf Spaether · Cincinnati, US
• Stephan Huffer · Birkenfeld, DE
• John Lynch
• Wolfgang Bidell · Mutterstadt, DE
• Joachim Rosch · Ludwigshafen, DE
• Gunther Schweier · Osthofen, DE
• Roland Hingmann · Ladenburg, DE
• Alexandre Segul · Tarragona, ES
• Rainer Hemmerich · Havelsee, DE
• Ingo Treffkorn · Hagenbach, DE

Key dates

• Filing date: Jan 2, 2001
• Grant date: Feb 25, 2003
• Expiry date: Jul 30, 2021

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08F110/06
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

Catalyst systems of the Ziegler-Natta type comprise as active constituentsa) a solid component comprising a compound of titanium or vanadium, a compound of magnesium, a particulate inorganic oxide as support and an internal electron donor compound,and as cocatalystb) an aluminum compound andc) if desired, a further, external electron donor compound,wherein the particulate, inorganic oxide used has a specific surface area of from 350 to 1000 m2/g and a mean particle diameter {overscore (D)} in the range from 5 to 60 &mgr;m and comprises particles which are composed of primary particles having a mean particle diameter {overscore (d)} in the range from 1 to 10 &mgr;m and contain voids or channels between the primary particles, where the macroscopic proportion of voids or channels having a diameter of greater than 1 &mgr;m in the particles of the inorganic oxides is in the range from 5 to 30% by volume and the molar ratio of the compound of magnesium to the particulate, inorganic oxide is from 0.5:1 to 2.0:1.