Process for the production of polypropylene
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United States of America Patent
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Jul 11, 1995
Grant Date -
N/A
app pub date -
Dec 12, 1990
filing date -
Dec 12, 1990
priority date (Note) -
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Abstract
A process for the polymerization of propylene or a mixture comprising propylene and one or more alpha-olefins and, optionally, one or more diolefins comprising contacting the propylene or the mixture of olefins in at least one reaction zone, under polymerization conditions, with a catalyst system comprising (i) a solid catalyst precursor, which includes magnesium; titanium; a halogen which is chlorine, bromine, or iodine, or mixtures thereof; and a mono- or polycarboxylic acid ester; (ii) a hydrocarbylaluminum cocatalyst; and (iii) a mixture of selectivity control agents comprising a mono- or polycarboxylic acid ester and a silicon compound containing at least one silicon-oxygen-carbon linkage with the proviso that (a) the atomic ratio of aluminum to titanium is in the range of about 5 to about 300; and (b) the molar ratio of the ester to silicon compound in the mixture of selectivity control agents is at least about 1.5:1.
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