Supported high activity polyolefin catalyst component with regular distribution of magnesium values provided utilizing a controlled drying protocol
First Claim
1. In a method of preparing a supported catalyst component for the polymerization of at least one alpha olefin, including the steps of effecting interaction between a hydrocarbon soluble magnesium compound solubilized in a hydrocarbon solvent with an inorganic catalyst support including applying said magnesium compound in said solvent to said support, and drying the so-treated support to concentrate the solution, the improvement which comprises effecting such drying so to remove a selected proportion of said solvent and effect the formation of a regular spatial distribution of magnesium values in and upon the effective surface area of said inorganic support, wherein the magnesium value upon the completion of the drying step is from about 0.1 to about 12 weight percent of magnesium to inorganic support.
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Abstract
A novel catalyst support and a method for preparation thereof, characterized by the presence of selected amounts of a hydrocarbon soluble magnesium-containing compound applied to the support relative to solvent, wherein a surface uniformly and essentially continuously moistened with the solvated magnesium compound in a condition of incipient precipitation to permit the formation of a regular essentially continuous distribution of the magnesium compound onto and conforming to the support material. The drying process under these conditions is effective in maintaining to a high degree the effective surface area and pore volume of the material. The support containing the adsorbed magnesium is then dried in a controlled manner to essential incipient wetness conditions providing a regular spatial distribution of stacked reticular magnesium values at a level of one to five molecular monolayers on the support.
A representative process for polymerizing or copolymerizing olefins providing stereospecific polymers such as propylene is disclosed.
30 Citations
24 Claims
- 1. In a method of preparing a supported catalyst component for the polymerization of at least one alpha olefin, including the steps of effecting interaction between a hydrocarbon soluble magnesium compound solubilized in a hydrocarbon solvent with an inorganic catalyst support including applying said magnesium compound in said solvent to said support, and drying the so-treated support to concentrate the solution, the improvement which comprises effecting such drying so to remove a selected proportion of said solvent and effect the formation of a regular spatial distribution of magnesium values in and upon the effective surface area of said inorganic support, wherein the magnesium value upon the completion of the drying step is from about 0.1 to about 12 weight percent of magnesium to inorganic support.
- 15. A particulate, granular catalyst component useful for preparing a catalyst for the polymerization of alpha olefins to stereospecific polymers of high bulk density and high heptane insolubles with high yield and activity comprising a high surface area/high pore volume silica support impregnated with an alkoxymagnesium halide regularly microdistributed thereon in an amount sufficient to provide 0.1 to 10 weight percent of magnesium in and upon said support, and the treated surface of the support being essentially uniformly wetted with solvent after removal of a portion of said solvent
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23. A catalyst component for the polymerization of propylene and alpha olefin monomers copolymerizable therewith comprising an inorganic support of high surface area and pore volume treated with an alkoxy magnesium halide compound and a titanium halide, wherein the alkoxymagnesium halide values are distributed in and upon the surface of said inorganic support responsive to the controlled removal of solvent for said magnesium compound to provide a residual regularly distributed population of magnesium values of from about 0.05 to about 12 weight percent of magnesium to silica.
Specification