The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jun. 27, 1978
Filed:
Mar. 28, 1977
Walter P Barie, Jr, Shaler Township, Allegheny County, PA (US);
Gulf Research & Development Company, Pittsburgh, PA (US);
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.