Propylene polymerization with δ-TiCl3/AlClEt2 and δ-TiCl3/AlEt3 catalyst systems

Some parameters of propylene polymerization using δ-TiCl3/AlClEt2 and δ-TiCl3/AlEt3 catalyst systems were evaluated. The catalyst was prepared through the reduction of TiCl4 complexed with di-n-butyl ether (DBE) (mole ratio DBE/TiCl4=0.67) by AlClEt2. Propylene polymerizations were carried out at different Al/Ti ratios, using AlEt3 or AlClEt2 as cocatalysts and different polymerization temperatures. The effects of these parameters on catalyst activity, stereo-specificity and polymer molecular weight were investigated. The results indicate that these parameters strongly affect catalyst performance.