| 摘要 |
An olefin copolymer is prepared by copolymerizing ethylene, an alpha -olefin and, optionally a diene having non-conjugated double bonds by solution polymerization in the presence of: (a) an organoaluminum compound, (b) a vanadium compound in the oxidation state from +3 to +5, and (c) an activator in a molar ratio of from 0.5 to 100 relative to vanadium of said vanadium compound, and an activator of a 2-halomalonic ester substituted by an aromatic group and having the formula <IMAGE> wherein X=F, Cl, Br or I, Ar is an aromatic radical which is unsubstituted, monosubstituted or polysubstituted by alkyl or alkoxy groups and which is bound to the central carbon atom either directly or by an intervening carbonyl group; and R1 and R2 are hydrocarbon radicals having from 1 to 20 carbon atoms.
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