Modification of catalysts for propylene polymerization: Alcohols and lewis bases

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Abstract
A series of compounds were examined as modifiers for the high activity supported catalyst TiCl4/MgCl2–AlEt3 for isospecific propylene polymerization. The list included two aromatic acid esters, 21 various Lewis bases, and 12 alcohols. A convenient graphic method is described for comparing the performance of different modifiers by plotting experimental results in coordinates “relative activity‐isotactic index” and a kinetic rationale for this evaluation is presented. Aromatic acid esters exhibit much better performance than the bulk of Lewis bases but some sterically demanding aromatic alcohols show behavior show similar to that of the esters.

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