Phillips catalyst and its use for the preparation of ethylene homopolymers and copolymers

US5352658A · kind A · utility

Assignee

• BASF SE

Inventors

• Kaspar Evertz · Schifferstadt, DE
• Roland Saive · Ludwigshafen, DE
• Guido Funk · Worms, DE
• Peter Koelle · Ludwigshafen, DE
• Rainer Konrad · Putlitz, DE
• Hans Gropper · Schifferstadt, DE

Key dates

• Filing date: Feb 11, 1993
• Grant date: Oct 4, 1994
• Expiry date: Feb 11, 2013

Classification

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

Abstract

A novel Phillips catalyst for the homopolymerization of ethylene and the copolymerization of ethylene with .alpha.-olefins contains, as a catalytically active component, a chromium catalyst supported on a finely divided aluminum silicate gel, modified with a fluoride and activated in an oxidizing atmosphere at elevated temperatures. The finely divided aluminum silicate gel (carrier gel) used here has an alumina content of from 0.5 to 6% by weight, the alumina being concentrated in the surface region of the carrier gel particles. The novel Phillips catalyst has high productivity and gives high molecular weight ethylene homopolymers and copolymers which have excellent low temperature impact strength and do not tend to swell in the blow molding process on emergence from the extruder die.