Polymerization of vinyl chloride and copolymerization with propylene by a ternary catalyst system

Polymerization of vinyl chloride by the ternary catalyst system of VOCl₃–AIR_nCl_3–n complexing agent was investigated. It was suggested that the formation of a polar complex (or charge-transfer complex) between AlR_nCl_3–n and the complexing agent participated in the polymerization of vinyl chloride. In the copolymerization of vinyl chloride with propylene with the present catalyst system, it was more difficult to incorporate the propylene unit in the copolymer than with a typical radical catalyst.