Process for preparing aromatic polyimides, polyimides prepared t

Details Process for preparing aromatic polyimides, polyimides prepared t Process for preparing aromatic polyimides, polyimides prepared t

1973-05-25

1976-12-21

Lee, Lester L.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

260 334P, 260 465E, 260 47UA, 260 49, 260 63R, 260 65, 260 67R, 260 78TF, 260 78UA, 428474, C08G 7310, C08G 7312

Patent

active

039987868

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 and at least one aromatic diamine 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. Other monomers, e.g., a monoamine or an .alpha.,.beta.-carboxylic acid monoanhydride can be added to the mixture so as to provide reactive end groups, preferably olefinically terminated, 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: 3179634 (1965-04-01), Edwards
patent: 3277043 (1966-10-01), Holub
patent: 3576691 (1971-04-01), Meyers
patent: 3671490 (1972-06-01), Bargain
patent: 3678015 (1972-07-01), Holub et al.
patent: 3709862 (1973-01-01), Minami

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