As part of a study on the polymn. of propene [115-07-1] in the presence of MgCl2-supported catalysts, results were obtained for polymg. at variable Et benzoate (I) [93-89-0]-alkylaluminum and alkylaluminum-Ti mole ratios. The pretreatment of MgCl2 with the Lewis base is essential to achieve high stereoregularities without an unacceptable decrease of polymn. rate, apparently because it prevents the formation of nonstereospecific active sites of low Lewis acidity, which require high I-alkylaluminum mole ratios in the cocatalyst to be poisoned. The data can be explained in the framework of a model of catalytic sites, presented in Part 1 of this series.
POLYMERIZATION OF PROPENE IN THE PRESENCE OF MGCL2-SUPPORTED ZIEGLER-NATTA CATALYSTS .2. EFFECTS OF THE COCATALYST COMPOSITION / Busico, Vincenzo; Corradini, P; Demartino, L; Proto, A; Albizzati, E.. - In: DIE MAKROMOLEKULARE CHEMIE. - ISSN 0025-116X. - STAMPA. - (1986), pp. 1115-1124.
POLYMERIZATION OF PROPENE IN THE PRESENCE OF MGCL2-SUPPORTED ZIEGLER-NATTA CATALYSTS .2. EFFECTS OF THE COCATALYST COMPOSITION
BUSICO, VINCENZO;
1986
Abstract
As part of a study on the polymn. of propene [115-07-1] in the presence of MgCl2-supported catalysts, results were obtained for polymg. at variable Et benzoate (I) [93-89-0]-alkylaluminum and alkylaluminum-Ti mole ratios. The pretreatment of MgCl2 with the Lewis base is essential to achieve high stereoregularities without an unacceptable decrease of polymn. rate, apparently because it prevents the formation of nonstereospecific active sites of low Lewis acidity, which require high I-alkylaluminum mole ratios in the cocatalyst to be poisoned. The data can be explained in the framework of a model of catalytic sites, presented in Part 1 of this series.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
