Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Treating polymer containing material or treating a solid...
Patent
1991-12-12
1993-09-14
Schofer, Joseph L.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Treating polymer containing material or treating a solid...
528489, 528497, 528499, C08F 608
Patent
active
052450074
ABSTRACT:
A method for purifying an ethylene-.alpha.-olefin olefin having at least 3 carbon atoms, or ethylene with an .alpha.-olefin having at least 3 carbon atoms and a nonconjugated 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.
REFERENCES:
patent: 3119797 (1964-01-01), McGaughy
patent: 3374212 (1968-03-01), Marinak et al.
patent: 3496156 (1970-02-01), Luciani et al.
patent: 3644321 (1972-02-01), Koga et al.
Inagaki Katsunari
Saba Hayato
Sugimori Kiyoyuki
Wakatsuki Kizuku
Yamamoto Keisaku
Schofer Joseph L.
Sumitomo Chemical Co,. Ltd.
Weber Tom
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