Dual donor catalyst system for the polymerization of olefins
AssigneeExxonMobil Chemical Patents Inc.
InventorsNemesio Delgado Miro, George Byron Georgellis, Homer Swei
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Abstract
The present invention provides a catalyst system that exhibits unexpected control of desired properties in polyolefin products. The catalyst system includes a titanium-supported catalyst in combination with a mixture of tetraethoxysilane (TEOS) and dicyclopentyldimethoxy-silane (DCPMS). This catalyst system has been found to be effective in making polypropylene and polypropylene copolymers having relatively high melt flow rates and moderately broad molecular weight distribution.
Claims7
A propylene polymer having a MWD from 3 to less than 6, a DSC crystallization temperature from 109.5° C. to 115.4° C., and a MFR from 20 to 120 dg/min;
- wherein the propylene polymer is polymerized using a dual electron donor system consisting essentially of dicyclopentyldimethoxysilane and tetraethoxysilane.
Dependencies are inferred from the claim text.