Method for purifying ethylene-.alpha.-olefin copolymer

Details Method for purifying ethylene-.alpha.-olefin copolymer Method for purifying ethylene-.alpha.-olefin copolymer

C - Chemistry, Metallurgy

08

F

C08F 6/08 (2006.01) C08F 6/02 (2006.01)

Patent

CA 2057526

ABSTRACT OF THE DISCLOSURE A method for purifying an ethylene-.alpha.-olefin copolymer obtained by polymerizing ethylene with an .alpha.- olefin having at least 3 carbon atoms, or ethylene with an .alpha.-olefin having at least 3 carbon atoms and a non- conjugated diene compound, in a hydrocarbon solvent in the presence of a catalyst comprising a vanadium compound, an organoaluminum compound, and a halogenated ester compound, the method including a step of mixing and stirring the polymerization reaction mixture obtained by the polymerization reaction in an aqueous alkaline solution in such an amount as to give an aqueous phase having a pH of not lower than 10.0 after mixing and stirring, is disclosed. A method for purifying an ethylene-.alpha.-olefin copolymer is also disclosed, including a step of an oxidation treatment of the polymerization reaction mixture in an aqueous alkaline solution in such an amount as to give an aqueous phase having a pH of not lower than 10.0 after the oxidation treatment. - 43 -

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