Reductions of TiC14 by organoaluminium compounds were carried out in hydrocarbon and halogenated hydrocarbon solvents using various ethers as donor. Under appropriate conditions, TiC14 was quantitatively reduced by trialkylaluminium to give a homogeneous black solution of TiCl3.~AICla.ether complex. Catalyst systems of the soluble TiC13 and A1 (i-Bu)3 (cocatalyst) showed high catalytic activities for random copolymerization of ethylene with propylene. The resulting copolymers were superior elastomers with low crystallinity and had outstandingly high tensile strength and elongation at break in comparison with copolymers prepared from a conventional VOCla/AI(Et)I.5Cll.5 catalyst system. Characterization data of copolymers suggest that the excellent tensile properties are due to microblock-type sequences of ethylene and propylene in a polymer chain.
Посилання на статтю:
Preparation of soluble TiCI 3 catalysts by reduction of TiCI 4 with organoaluminium compounds and their use for copolymerization of ethylene with propylene / K. Makino, K. Tsuda* and M. Takaki // Polymer. – 1992. – Vol 33. – P. 2416-2420.