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US 5,494,871 AGranted
Process for preparing a prepolymerized olefin polymerization catalyst
AssigneeElf Atochem S.A.
InventorsClaude Brun, Michel Avaro
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Abstract
A stable, long-lived catalyst composition, well suited for the polymerization of olefins, e.g., of ethylene, comprises intimate admixture of particulates of an olefin prepolymer and a catalytically effective amount of particles of a metallic olefin polymerization catalyst, such olefin prepolymer particulates having a particle size distribution narrower than the particle size distribution of the metallic catalyst particles.
Claims9
A process for the production of a catalyst prepolymer comprising:
- prepolymerizing ethylene in a gas phase or in suspension, said ethylene optionally being in admixture with an alpha-olefin comonomer having from 3 to 8 carbon atoms, in the presence of (i) a catalyst system including a catalyst component and a cocatalyst component, said catalyst component containing titanium, magnesium, chlorine and, optionally, an electron donor or electron acceptor;
- and (ii) filler powder particles;
- and
- removing at least part of the filler powder particles after formation of the prepolymer.
1 more element
Dependencies are inferred from the claim text.