Copolymerization of ethylene with αolefins over highly active supported ZieglerNatta catalyst with vanadium active component

The new highly active supported vanadiummagnesium catalyst (VMC) has been studied in αolefin (1butene, 1hexene)/ ethylene copolymerization in the presence of hydrogen. Data on the effect of αolefin/ethylene ratio 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 both αolefins are effective chain transfer agents in the ethyleneαolefins copolymerization. The copolymerization ability of VMC is much higher than that of the well known titaniummagnesium catalysts. It was found that the use of optimal conditions of ethylene/αolefin polymerization on the VMC catalyst makes it possible to obtain copolymers with a high yield (1016 kg gcat1 cat for 2 h) the copolymers having 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 with different molecular weight was found in distinction to inhomogeneous distribution of branchings in copolymers produced over the well known supported titaniumagnesium catalyst.