Chemistry of carbon compounds – Miscellaneous organic carbon compounds
Patent
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.
Lee Lester L.
University of Notre Dame du Lac
LandOfFree
Process for preparing aromatic polyimides and some polyimides pr does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Process for preparing aromatic polyimides and some polyimides pr, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Process for preparing aromatic polyimides and some polyimides pr will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-125360