Phillips catalyst and its use for the preparation of ethylene/.alpha.-olefin copolymers

US5557021A · kind A · utility

Assignee

• BASF SE

Inventors

• Hans-Joachim Mueller · Havelsee, DE
• Kaspar Evertz · Schifferstadt, DE
• Siegfried Weber · Stuttgart, DE
• Guido Funk · Worms, DE
• Rainer Konrad · Putlitz, DE
• Roland Saive · Ludwigshafen, DE

Key dates

• Filing date: Aug 8, 1995
• Grant date: Sep 17, 1996
• Expiry date: Aug 8, 2015

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 copolymerization of ethylene with .alpha.-olefins, contains, as a catalytically active component, a finely divided, aluminum silicate-supported, phosphorus-containing chromium catalyst. This can be prepared by applying at least one organic phosphorus(III), (IV) and/or (V) compound and at least one chromium(III) compound which does not react with said phosphorus compounds under the reaction conditions used, in succcession in any order or simultaneously, to a finely divided aluminum silicate hydrogel or xerogel with formation of a catalyst intermediate and activating the catalyst intermediate at elevated temperatures in an oxidizing atmosphere, with the result that the chromium catalyst is formed. The novel Phillips catalyst gives ethylene/.alpha.-olefin copolymers in which the comonomers are more uniformly distributed over the copolymer chains than is the case with ethylene/.alpha.-olefin copolymers which have been prepared with the aid of conventional Phillips catalysts. Moldings which have been produced from the ethylene/.alpha.-olefin copolymers obtained in the novel procedure have a particularly high environmental stress cracking resistance and …