Bp Chemicals Limited

Stephen John Dossett

Nevin John Stewart

An improved supported Ziegler-Natta catalyst especially useful for olefin polymerisation, the catalyst including a carrier, an organomagnesium compound, a borate compound, and one transition metal compound.

High activity polyethylene catalysts prepared with borates reagents

A catalyst composition prepared by reacting together

Catalyst composition

A catalyst composition prepared by reacting together (a) a source of a Group VIII metal; (b) a bidentate phosphine ligand having at least two phosphorus atoms joined by a bridging group of the formula --(N).sub.x --(P).sub.y --N-- where x is 0 or 1; and (c) a promoter is disclosed. The Group VIII metal is preferably palladium. The promoter can be a weakly or non-coordinating anion. Alternatively it can be a boron hydrocarbyl compound or an aluminoxane. Also disclosed are novel bidentate phosphine ligands and intermediates therefor as well as novel palladium complexes. The catalysts are used in the preparation of polyketones.

A catalyst composition prepared by reacting together:

Catalyst compositions

A catalyst composition suitable for use in a process for the preparation of polyketones comprising a group VIII metal complex of a phosphonite of formula (I)

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Aldershot, United Kingdom

Stephen John Dossett