Chemistry of carbon compounds – Miscellaneous organic carbon compounds
Patent
1974-05-06
1978-02-14
Tillman, Murray
Chemistry of carbon compounds
Miscellaneous organic carbon compounds
260 78TF, 260326C, 427120, 428458, C08J 306
Patent
active
040737888
ABSTRACT:
The process for producing polyamide acid and polyimide polymers for use as coating materials by reacting an aromatic dianhydride reactant with an aromatic diamine reactant to produce a polyamide acid polymer wherein said reactants are present in approximately equal molar quantities, by utilizing the steps of forming an anhydrous mixture of an aromatic dianhydride reactant and an aromatic diamine reactant in an organic solvent wherein the reactants are in the molar ratio of about two-to-one, reacting said reactants at a temperature below that at which imidization occurs to form an amide acid intermediate having two free carboxyl groups each ortho to an amide group, and further reacting said amide acid intermediate with a reactant of the character of the original reactant initially present in the lesser amount with said additional reactant being in the molar amount equal to the molar amount of said lesser initial reactant thereby to form a polyamide acid polymer for use as a coating material. Additional steps may include the addition of a volatile ammonium base to produce a water soluble polyamide acid polymer and diluting the coating medium with water to form an aqueous-organic coating medium. The amide acid intermediate may be partially imidized and appropriate flow agents may be added. The coating medium is applied to a substrate to form a coating and the coating is cured to a polyimide form by the application of heat. The resulting product is a substrate with a polyimide coating.
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General Electric Company
Koeckert A. H.
Papin Joseph E.
Tillman Murray
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