Modified ziegler-natta catalyst systems
OwnerElsa Martigny, Vincent Monteil +2inventors
InventorsElsa Martigny, Vincent Monteil, Roger Spitz, Aurélien Vantomme
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Abstract
This invention relates to modified Ziegler-Natta catalyst systems that have an excellent activity in homo- or co-polymerisation of ethylene and alpha-olefins and are able to produce polymers having reduced molecular weight distribution and improved incorporation of hexene with respect to conventional Ziegler-Natta catalyst systems.
Claims13
A method for modifying a Ziegler-Natta catalyst by introducing on the surface of a precatalyst composed of a magnesium dichloride, or on the surface of a conventional Ziegler-Natta catalyst, composed of magnesium dichloride, titanium tetrachloride and optionally an internal Lewis base, either a solution containing a chloride MCln wherein M is selected from Groups 3, 4, 5 or 6 of the Periodic Table and n is the valency of M and wherein the solution containing MCln is hot TiCl4, or a solid chloride MCln followed by addition of TiCl4, or a titanium halide wherein the halogen is not chlorine, characterised in that said modification results in changing the Ti active site electronic environment.
Dependencies are inferred from the claim text.