Process for preparing spherical polymerization catalyst components for use in olefin polymerizations
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United States of America Patent
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Jul 25, 2017
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Oct 10, 2014
filing date -
Oct 10, 2014
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Abstract
A method of making a solid catalyst component for production of a polyolefin, including the steps of: a) dissolving a halide-containing magnesium compound in a mixture including alkylepoxide, an organic phosphorous compound, a carboxylic acid or anhydride, and a hydrocarbon solvent to form a homogenous solution; b) optionally treating the homogeneous solution with a halogenating agent; c) treating the homogenous solution with a first titanium halide compound in the presence of a surface modifier and optionally a first electron donor to form a solid precipitate, wherein, if present, the first electron donor is an ether; d) optionally treating the solid precipitate with a second electron donor; and e) treating the solid precipitate with a second titanium halide compound and optionally with a second electron donor to form the solid catalyst component.
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