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Process for preparing aromatic polyimides, polyimides prepared thereby

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posted on 2016-06-07, 00:00 authored by Gaetano Francis D'Alelio
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.

History

Patent Number

US 3998786 B2

Other Application

05/363,800

Inventor

Gaetano Francis D'Alelio

Inventor from Local Institution

Gaetano Frank D'Alelio

Assignee

University of Notre Dame Du Lac

Date Modified

2016-06-07

Language

  • English

Claims

22

Publisher

United States Patent and Trademark Office

Cooperative Patent Classification Codes

C08G 73/101 (20130101); C08G 73/1057 (20130101); C08G 73/106 (20130101); C08G 73/1067 (20130101); C08G 73/1071 (20130101); C08G 73/1064 (20130101); Y10S 525/925 (20130101); Y10S 525/928 (20130101)

Contributor

Gaetano Frank D'Alelio

International Patent Classification Codes

C08G 73/00 (20060101); C08G 73/10 (20060101); C08G 073/10 (); C08G 073/12 ()

US Patent Classification Codes

526/70; 524/741; 525/422; 525/436; 525/925; 525/928; 526/259; 526/263; 526/285; 526/67; 526/71; 528/125; 528/126; 528/128; 528/170; 528/172; 528/179; 528/188; 528/207; 528/208; 528/222; 528/229; 528/317; 528/322; 528/351; 528/352; 528/353; 546/37; 546/66; 548/455;

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