copolymerization of ethylene with αolefins over highly active supported ziegler-natta catalyst with vanadium active component

A new highly active supported vanadium-magnesium catalyst (vmc) has been studied in α-olefin (1-butene,1-hexene)/ ethylene copolymerization in the presence of hydrogen. data on the effect of α-olefin/ethyleneratio in copolymerization on the content of branchings in copolymers, kinetic profile, copolymer yield,molecular weight and molecular weight distribution of copolymers have been obtained. it was found that bothα-olefins are effective chain transfer agents in the ethylene-α-olefins copolymerization. the copolymerizationability of vmc is much higher than that of the well-known titanium-magnesium catalysts. it was found that theuse of optimal conditions of ethylene/α-olefin polymerization on the vmc catalyst makes it possible to obtain copolymers with a high yield (10-16 kg gcat-1 cat for 2 h) and broad and bimodal mwd. data on the branchings distribution in copolymers prepared with vmc catalyst have been obtained via fractionation of copolymers on the fractions with narrow polydispersity (mw/mn ≈ 2). quite a uniform distribution of branchings over fractions withdifferent molecular weights was found in distinction to inhomogeneous distribution of branchings in copolymers produced over the well-known supported titanium-magnesium catalyst.