| 摘要 |
PROBLEM TO BE SOLVED: To provide a method for producing an olefin polymer having long chain branching, especially an EPDM(ethylene-propylene-diene-methylene) tetrapolymer. SOLUTION: This method for producing an ethylene-propylene-diene-methylene(EPDM) tetrapolymer having long chain branching is to polymerize a monomer mixture comprising ethylene, propylene, a first diolefin monomer having a polymerizable bouble bond and a second diolefin monomer having two polymerizable double bonds in the presence of a catalytic system comprising a catalyst containing V+3 with proviso that any halogen directly combined with vanadium is not contained, a halogenated organoalumium promoter where a molar ratio of a halogen to aluminum is about 1 to about 2 and an activator.
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