Preparation of acetylene-substituted polyimide oligomers and pol

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

1977-03-28

1978-06-27

Lee, Lester L.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

260 47CP, 260 49, 260 63R, 260 65, 260 78UA, 260 78TF, 260326N, 428474, C08G 7312

Patent

active

040974561

ABSTRACT:
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.degree. F. (316.degree. 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 aminoarylacetylene 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.

REFERENCES:
patent: 3845018 (1974-10-01), Bilow et al.
patent: 3879349 (1975-04-01), Bilow et al.
patent: 3897395 (1975-07-01), D'Alelio
patent: 3998786 (1976-12-01), D'Alelio

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