The effect of the type of organoaluminium compounds on the course of stereospecific polymerization of propylene in the presence of selected titanium catalysts of the second generation
A laboratory-scale method of propylene polymerization and criteria applied for the evaluation of properties of catalytic systems comprising titanium catalysts of the second generation and various organoaluminium compounds ascocatalysts were presented. As titanium catalysts a microspherical catalyst andcommercial catalyst Lynx 900, and as cocatalysts: Et2AlCl, Et3Al2Cl3, Et2AlCl + EtAlCl2, Et2AlCl + Et3Al, AlF0.75Cl0.75Et1.5 and AlF0.3Cl0.8Et1.7 were used. The evaluation criteria were: activity of the catalytic system, content of atactic fraction in polymer and bulk density of PP-i. The effect of the changes of Cl/Al ratio in the range from 1.5 to 0.8 and of a partial replacement of Cl by F in the polymerization were characterized.
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