Method for recovering low molecular weight polymers

Details Method for recovering low molecular weight polymers Method for recovering low molecular weight polymers

1977-03-14

1979-01-23

Crasanakis, George

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

260680B, 260674SE, C07C 1500

Patent

active

041360885

ABSTRACT:
A method for recovering a low molecular weight polymer containing no catalyst residue, which method comprises the steps of: polymerizing a conjugated diolefin or copolymerizing comonomers of conjugated diolefins and a vinyl compound having anionic polymerization activity in the presence of a catalyst containing an organic sodium compound and a chain transfer agent of an alkyl aryl compound; uniformly mixing the obtained polymerization mixture with an isopropyl alcohol aqueous solution; separating the thus obtained mixture into two phases of a polymer mixture containing the liquid low molecular weight polymer and an isopropyl alcohol aqueous solution containing catalyst residue; and separating the low molecular weight polymer from the polymer mixture.

REFERENCES:
patent: 2813136 (1957-11-01), Mertz
patent: 3448160 (1969-06-01), Schleimer
patent: 3789090 (1974-01-01), Otsuki et al.

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