Abstract
Polymerizations of ethylene or propylene were conducted in toluene employing the soluble catalytic system TiCl 4. THF/AlCl 2(C 2H 5)/Al(i-C 4H 9) 3 combined with different metal chlorides (CoCl 2,MgCl 2 or ZnCl 2) complexed with tetrahydrofuran (THF). The catalyst activity was strongly dependent upon the metal chloride used as modifier. A clear increase of catalyst activity in ethylene polymerization was observed when the Co/Ti or Mg/Ti mole ratio was increased up to 2 and then decreased markedly. In a similar way, the catalyst activity in propylene polymerization was strongly dependent upon the amount and kind of metal chloride used as modifier.
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