Process for preparing aromatic polyimides and some polyimides pr

Details Process for preparing aromatic polyimides and some polyimides pr Process for preparing aromatic polyimides and some polyimides pr

1974-12-16

1978-02-21

Lee, Lester L.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

260 334P, 260 465E, 260 47UA, 260 49, 260 63R, 260 65, 260 78TF, 260 78UA, 260250BN, 260326C, 260326S, 260326N, 260326A, 260326R, 260326HL, 428474, C08G 7310, C08G 7312

Patent

active

040751716

ABSTRACT:
A process for preparing substantially completely cyclized aromatic polyimides, either monomeric, oligomeric or polymeric, is provided. The process involved the reaction of a mixture of at least one tetracarboxylic acid dianhydride, at least one aromatic diamine and an .alpha.,.beta.-carboxylic acid monoanhydride in at least one aromatic phenol, preferably cresols, in the presence of an organic azeotroping agent such as a cyclic hydrocarbon, preferably benzene, until substantially all of the water of reaction is eliminated. The monoanhydride provides reactive end groups which will enable the polyimide to cure by coupling together by addition or condensation thereby increasing molecular weight with little or no by-product. After the water is removed, it is preferred that the azeotroping agent be removed and then the polyimide increased in molecular weight by heating in the aromatic phenol.
The polymer can then be isolated by concentration or precipitation as a powder, or the polymer in solution can be used to prepare coatings on various substrates.

REFERENCES:
patent: B497490 (1976-03-01), D'Alelio
patent: 3671490 (1972-06-01), Bargain
patent: 3763114 (1973-10-01), Saluti et al.
patent: 3879349 (1975-04-01), Bilow et al.

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