Phillips catalyst and its use for preparing ethylene homopolymers and copolymers

US5324697A · kind A · utility

Assignee

• BASF SE

Inventors

• Hans-Joachim Mueller · Havelsee, DE
• Rainer Konrad · Putlitz, DE
• Guenther Schweier · Friedelsheim, DE
• Siegfried Weber · Stuttgart, DE
• Roland Saive · Ludwigshafen, DE
• Peter Koelle · Ludwigshafen, DE

Key dates

• Filing date: Jun 26, 1992
• Grant date: Jun 28, 1994
• Expiry date: Jun 26, 2012

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08F10/02
• 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 catalytically active components a specific chromium catalyst on an aluminum phosphate support and cocatalysts of the formula I to IV, ##STR1## where M is lithium, sodium and potassium, PA0 M.sup.1 is magnesium and zinc, PA0 M.sup.2 is boron and aluminum, PA0 R is C.sub.1 -C.sub.10 -alkyl and C.sub.6 -C.sub.20 -aryl, PA0 R.sup.1 is R and C.sub.1 -C.sub.10 -alkoxy and C.sub.6 -C.sub.20 -aryloxy, PA0 X is chlorine, bromine and iodine, PA0 n is 0, 1 and 2 The chromium catalyst on an aluminum phosphate support can be obtained by applying chromium compounds to a finely divided aluminum phosphate with a P:A1 molar ratio near to or equal to 1 and a pore volume of >1 cm.sup.3 /g and activating the resulting intermediate at elevated temperatures in an oxidizing atmosphere. The novel Phillips catalyst has an exceptionally long duration of activity and its productivity can be increased further by adding hydrogen.