SUPPORTED POLYMERISATION CATALYSTS

摘要

An improved method for the preparation of a supported polymerisation catalys t system comprises the combination of (i) a porous support (ii) a polymerisabl e monomer, (iii) a polymerisation catalyst, and (iv) a cocatalyst, characteris ed in that the polymerisable monomer is added to the porous support before addition of one or both of the polymerisation catalyst and the cocatalyst. T he preferred polymerisation catalyst is a metallocene complex and the preferred porous support is silica. The resultant supported catalysts are stable over long periods of time. The supported catalysts are particularly suitable for use in the gas phase.