Purification of acetylene-terminated polyimide oligomers

Details Purification of acetylene-terminated polyimide oligomers Purification of acetylene-terminated polyimide oligomers

1979-12-05

1981-12-22

Schain, Howard E.

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

Synthetic resins

From phenol, phenol ether, or inorganic phenolate

528188, 528192, 528350, 528353, 528392, 528488, 528492, 528494, 528496, 528499, C08G 7312, C08G 7310, C08J 314

Patent

active

043072208

ABSTRACT:
A process for purifying an acetylene-terminated polyimide oligomer containing residual solvent in which the oligomer is initially dissolved in the same solvent used as the reaction medium in its synthesis. After precipitating the oligomer from solution by mixing with an aqueous solution of potassium or sodium chloride, the precipitated oligomer is washed successively with a plurality of liquids of decreasing polarity to provide an oligomer free of residual solvent.

REFERENCES:
patent: 3679638 (1972-07-01), Korsgen et al.
patent: 3845018 (1974-10-01), Bilow et al.
patent: 3864309 (1975-02-01), Bilow et al.
patent: 3879349 (1975-04-01), Bilow et al.
patent: 4218555 (1980-08-01), Antonoplos et al.

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