Method for recovering polyphenylene oxides

Details Method for recovering polyphenylene oxides Method for recovering polyphenylene oxides

1979-05-02

1981-01-20

Lee, Lester L.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Treating polymer containing material or treating a solid...

528495, 528499, C08G 6544, C08G 6546

Patent

active

042463980

ABSTRACT:
A method for recovering polyphenylene oxide having a high bulk density and a reduced content of fine particles from a solution of a polyphenylene oxide, which comprises adding a non-solvent composed of a lower alkyl alcohol and water to an aromatic solvent solution of a polyphenylene oxide substantially free from impurities to precipitate the polyphenylene oxide, the weight ratio of the aromatic solvent to the lower alkyl alcohol being from 1:1 to 1:2 and the weight ratio of the lower alkyl alcohol to water being from 1:0.005 to 1:0.1 in the precipitation system, and the addition of the non-solvent being controlled such that a liquid composition of the aromatic solvent, the lower alkyl alcohol and water forms a single phase; and recovering the precipitated polyphenylene oxide.

REFERENCES:
patent: 3306874 (1967-02-01), Hay
patent: 3306875 (1967-02-01), Hay
patent: 3923738 (1975-12-01), Van Sorge
patent: 4011200 (1977-03-01), Yonemitsu et al.
patent: 4067851 (1978-01-01), Tomita et al.

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