Patent ID: 7935779
Filing Date: 2011-05-03
Classification: C08G,Y10S

Abstract:
1. A process for synthesizing a polyimide having the formula comprising: a) reacting a dianhydride having the formula  with R b) reacting a poly (aryl carbodiimide) (p-CDI) and said acid-ester functionalized anhydride to form a poly-acylurea-functionalized ester-anhydride (p-AEA) having the formula c) reacting said p-AEA with R d) heating said p-AEAE in the presence of a CDI catalyst to a temperature from about 120° C. to about 280° C. to form an aryl isocyanate and a poly(acid-ester-amide) having the following formula and simultaneously conducting a sequential self-repetitive reaction to form said polyimide, wherein said sequential self-repetitive reaction involves repetitions of three sequential steps comprising: 1) catalytically converting said aryl isocyanate into said p-CDI in the presence of said CDI catalyst; 2) reacting said p-CDI and said poly(acid-ester-amide) to form a poly-acylurea-functionalized amide-ester (p-AAE) having the formula 3) thermolyzing said p-AAE obtained in step 2) into said aryl isocyanate and a poly-di(ester-amide) having the formula wherein, in the formulas above: n is an integer in the range of 1 to 100; R is a tetravalent aromatic organic radical containing at least one benzene ring or a tetravalent aliphatic organic radical containing at least two carbon atoms; and, R