Catalyst for the polymerization of ethylene, its preparation and the use of the resulting ethylene polymers for the production of films exhibiting little blocking

US4970184A · kind A · utility

Assignee

• BASF SE

Inventors

• Eckard Schauss · Heuchelheim, DE
• Heinz Vogt · Ludwigshafen, DE
• Rainer Hemmerich · Havelsee, DE
• Guenther Schweier · Friedelsheim, DE
• Rudolf Mueller-Mall · Schifferstadt, DE

Key dates

• Filing date: May 3, 1989
• Grant date: Nov 13, 1990
• Expiry date: May 3, 2009

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08F210/02
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

A catalyst for the copolymerization of ethylene by the gas-phase fluidized-bed method is prepared by a process in which a titanium-containing and magnesium-containing active component, reacted with an alcohol as a complexing agent, is applied to a finely divided silica from homogeneous solution, in the presence of a polysiloxane, by evaporating the solvent, and the resulting homogeneous catalyst intermediate is then preactivated by treatment with the alkylaluminum compound and the Lewis base in an inert hydrocarbon solution, and the copolymers prepared using the above catalyst are employed for the production of films exhibiting little blocking.