Catalytic preparation of polyimides from polyisocyanates
Abstract
Abstract THE USE OF CERTAIN CATALYSTS GIVES MARKEDLY IMPROVED REACTION RATES IN THE FORMATION OF IMIDES (MONO- AND POLY-) BY REACTION OF AN ISOCYANATE AND AN INTRAMOLECULAR ANHYDRIDE. THE CATALYSTS ARE HYDROXIDES OF FORMULA MOH AND UREAS OF FORMULA R-N(-M)-CO-NH-R1 (R AND R1 ARE HYDROCARBLY) WHEREIN M IN EACH CASE IS HYDROGEN OR IS SUCH THAT THE HYDROXIDE MOH FORMS A URETHANE WITH ISOCYANATE, WHICH URETHANE WILL DECOMPOSE WITH ELIMINATION OF CARBON DIOXIDE AT A TEMPERATURE NOT GREATER THAN ABOUT 150*C. A PREFERRED CATALYST IS PHENYLMERCURIC HYDROXIDE. TERTIARY AMINES CAN BE EMPLOYED AS COCATALYSTS. THE CATALYTIC PROCESS CAN BE APPLIED TO THE PREPARATION OF BOTH CELLULAR AND NON-CELLULAR POLYIMIDES BY REACTION OF POLYISOCYANATES AND POLYCARBOXYLIC ANHYDRIDES. OPTIONALLY A SOLVENT IS EMPLOYED IN THE REACTION.
Inventors
- 👤 Peter S Carleton
- 👤 William J Farrissey Jr
- 👤 James S Rose
Bibliographic Details
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