Olefins terpolymerization with Ziegler-Natta catalysts of different stereoregularity

Terpolymerizations of propylene/1-hexene/1-hexadecene had been carried out with high-isospecific and nonisospecific catalysts. For high-isospecific Solvay TiCl3-Cp(2)TiMe(2) catalyst system, polymerization rate accelerated and incorporation of 1-hexene and 1-hexadecene in terpolymer increased when feed ratio of 1-hexene and/or 1hexadecene increased. In contrast, catalyst activity and comonomers content decreased with addition of comonomers for nonisospecific MgCl2/TiCl3-TEA catalyst system. These phenomena might be explained with the concept of monomer diffusion limitation.