Method of preparation of polyimide acids

C - Chemistry – Metallurgy – 08 – G

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400/7710

C08G 73/10 (2006.01) C08G 73/14 (2006.01) C08L 79/08 (2006.01)

Patent

CA 1259438

ABSTRACT A one-step solution technique for preparing an aromatic polyamide acid which comprises reacting an aromatic dianhydride with an aromatic diamine in the presence of diglyme and a sufficient amount of a co-solvent to maintain the polyamide acid in solution, said co-solvent having the formula: ROH where R is H, an aliphatic branched or straight-chain hydrocarbon having from 1 to 5 carbon atoms or a methoxy substituted aliphatic branched or straight-chain hydrocarbon having from 1 to 5 carbon atoms.

486480

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