Ziegler-natta (pro)catalyst systems made with (multi-alkoxy)silane compound
AssigneeDow Global Technologies LLC
InventorsLinfeng Chen, Jesse C. Beilhart, David T. Gillespie, Mridula Kapur, Ian M. Munro, Eduardo Garcia, Nori Williams, Evelyn Auyeung, Kurt F. Hirsekorn
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Abstract
Ziegler-Natta (pro)catalyst systems made with an external electron donor compound, methods of synthesis of same, methods of olefin polymerization using same, and polyolefin polymers made thereby. The external electron donor compound is a (multi-alkoxy)silane.
Claims8
A procatalyst system suitable for making an olefin polymerization catalyst and consisting essentially of a blend of (A) a pre-made solid procatalyst and (B) a (multi-alkoxy)silane selected from the group consisting of tetraethoxysilane and propyltrimethoxysilane;
- wherein the (A) pre-made solid procatalyst consists essentially of a titanium compound, magnesium chloride solids, and optionally a silica;
- wherein the magnesium chloride solids consist essentially of MgCl2 and tetrahydrofuran;
- and wherein the procatalyst system is free of any other electron donor organic compound.
A method of making a catalyst system suitable for polymerizing an olefin, the method comprising simultaneously or sequentially contacting an activating effective amount of (C) an activator, (B) a (multi-alkoxy)silane selected from the group consisting of tetraethoxysilane and propyltrimethoxysilane, and (A) a pre-made solid procatalyst, thereby making the catalyst system;
- wherein the (A) pre-made solid procatalyst consists essentially of a titanium compound, magnesium chloride solids, and optionally a silica;
- wherein the magnesium chloride solids consist essentially of MgCl2 and tetrahydrofuran;
- and wherein the catalyst system is free of the any other electron donor organic compound and is suitable for polymerizing an olefin.
Dependencies are inferred from the claim text.