I. Kim

POLYMERIZATION OF PROPYLENE BY HIGHLY-ACTIVE CATALYSTS SYNTHESIZED WITH MG(OET) 2/BENZOYL CHLORIDE/TICL4 - DETERMINATION OF ACTIVE-SITE CONCENTRATION BY CO INHIBITION METHOD

SummaryActive centers have been studied in the polymerization of propylene using highly active Mg(OEt)2/Benzoyl chloride/TiCl4 catalysts activated with AlEt3. The method for the measurement of active centers is based on the inhibiting effect of CO on polymerization. The activity of the present catalysts, which is higher than that of TiCl3 or MgCl2-supported catalyst, is mainly due to the higher concentration of active centers by one order of magnitude. In order to investigate the stability of active centers during polymerization the number of active centers are compared at various polymerization times.

Homo- and Co-Polymerization of Ethylene with Highly Active Ti/Mg Bimetallic Complexes: Effect of crystallization conditions on structure and productivity

SummaryHomo- and co-polymerization of ethylene were performed by using a catalyst system composed of recrystallized MgCl2 TiCl4 THF complex with AlEt3. The effect of crystallization conditions during the catalyst preparation on the chemical composition and physical structure of catalysts was discussed with the help of element analysis, IR spectroscopy, and X-ray powder diffraction. The variation caused by different crystallization conditions had considerable influences on the rate profiles of homo-and co-polymerization of ethylene.