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Imperial Chemical Industries Limited

Imperial Chemistry Industries Plc

Ian D McKenzie

Franz Langhauser

Roland Hingmann

Ulrich Moll

Bernd Lothar Marczinke

David Fischer

Meinolf Kersting

Wolfgang Bidell

G&uuml;nther Schweier

Gunther Schweier

Jurgen Kerth

Rainer Hemmerich

Peter John Vaughan Jones

Peter Kolle

John Russell Grasmeder

Process for preparing carrier-borne transition metal catalysts

In catalyst systems of the Ziegler-Natta type modified during their preparation and comprising as active constituents

Ziegler-Natta catalyst systems modified during their preparation

A supported transition metal composition is obtained by suspending a support material in an inert liquid medium, spraying the suspension, collecting a solid material and contacting the sprayed solid with a transition metal compound. The support material may be a metal halide such as magnesium chloride or an inorganic oxide such as silica or alumina. In addition to being contacted with the transition metal compound, the support material may be contacted either before or after the spraying step with other reagents such as organo metallic compounds, halogen compounds, or Lewis Base compounds. The product obtained after contacting with the transition metal compound may be used as a component of a polymerization catalyst system to polymerize an unsaturated monomer such as ethylene or propylene.

Supported transition metal composition

A solid material which is a transition metal composition, or a support for a transition metal compound, is suspended in a liquid medium, the mixture is subjected to mechanical action and the treated mixture is spray-dried. If the solid is a support material, it is subsequently contacted with a transition metal compound. The mechanical action can be a grinding process or a process providing simultaneous vigorous agitation and a shearing action. The transition metal composition may be used with an organic metal compound to polymerize an unsaturated monomer to give a polymer of good particle form.

Spraying solid

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Ian D McKenzie