Preparation of acetylene-substituted polyimide oligomers

Details Preparation of acetylene-substituted polyimide oligomers Preparation of acetylene-substituted polyimide oligomers

C - Chemistry, Metallurgy

07

D

402/221, 402/33,

C07D 209/48 (2006.01) C07D 487/04 (2006.01) C08G 73/10 (2006.01)

Patent

CA 1104138

PREPARATION OF ACETYLENE-SUBSTITUTED POLYIMIDE OLIGOMERS Abstract of the Disclosure An improved method is described for the preparation of certain acetylene-substituted polyimide oligomers which are substantially free of reaction solvent and thus do not fracture at use temperatures above 600°F. (316°C.). The acetylene- substituted polyimide oligomers are prepared by reacting an aromatic tetracarboxylic acid dianhydride such as benzophenone tetracarboxylic acid dianhydride with an aromatic diamino compound such as a diamino polyarylene ether in the presence of N-methyl-2-pyrrolidone (NMP) as a solvent to form a first reaction product which is in turn reacted with an aminoaryl- acetylene to form a solution of an acetylene-substituted polyamic acid oligomer in NMP. The polyamic acid oligomer is thereafter converted to the desired acetylene-terminated polyimide oligomer by heating in the continued presence of said N-methyl-2-pyrrolidone. The N-methyl-2-pyrrolidone can then be removed by any suitable means such as by precipitation of the acetylene-substituted polyimide oligomer in a non-solvent such as ethanol.

296511

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