Abstract
AbstractSeveral kinds of MgCl2‐supported catalysts were prepared by grinding the mixtures of MgCl2 and MtCln(MtCln = TiCl4, ZrCl4, HfCl4, VCl3). Polymerization of propene was conducted at 40°C and 1 atm with these solid catalysts by using Cp2MtMe2 (Mt = Ti, Zr, Hf, V) as cocatalyst. Polymerization took place only with the use of the TiCl4/MgCl2 catalyst. Both the activity and isospecificity were found to strongly depend upon the cocatalyst used. The polymers produced were fractionated with boiling heptane and analyzed by means of 13C NMR, the results of which suggested the existence of two types of catalytic centers, isospecific and aspecific. Plausible models of these catalytic centers are proposed.
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