Method for making polyetheramide acid

Details Method for making polyetheramide acid Method for making polyetheramide acid

C - Chemistry, Metallurgy

08

G

402/221, 402/33

C08G 73/14 (2006.01)

Patent

CA 1148697

Abstract of the Disclosure A method is provided for making polyetheramide acid having an intrinsic viscosity in N,N-dimethylacetamide of about 0.05 dl/g to 0.4 dl/g at 25°C. A mixture of aromatic bis (ether dicarboxylic acid) or dianhydride is heated with a substantially equal molar amount of organic diamine in the presence of water and in the substantial absence of an organic solvent. The resulting polyetheramide acid is recovered as a finely divided powder and can be used to make high molecular weight polyether- imide by malt extrusion.

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