Mixed polyimides and process for preparing them

Details Mixed polyimides and process for preparing them Mixed polyimides and process for preparing them

C - Chemistry, Metallurgy

08

L

400/5804

C08L 79/08 (2006.01) C08G 73/10 (2006.01)

Patent

CA 2021047

To produce mixed polyimides having structural units of the general formulae (see fig. I) and (see fig. II) wherein n is an integer larger than 1 and R represents a divalent aromatic residue, a solution of an intramolecular tetracarboxylic acid dianhydride mixture including 50 to 99 % by mol benzophenone-3,3',4,4'- tetracraboxylic acid dianhydride and 50 to 1 % by mol pyromellitic acid dianhydride is heated in a polar aprotic solvent and is admixed with an altogether equimolar amount of 2,4- and/or 2,6-toluenediisocyanate and/or methylenebis(phenylisocyanate). The mixed polyimides according to the invention are readily soluble in organic solvents, are flame-retardant and exhibit a good thermostability.

Pour l'obtention d'un mélange de polyimides comportant des unités structurelles de formules générales (voir fig. I) et (voir fig. II), où n est un entier supérieur à 1 et R représente un radical aromatique divalent, une solution d'un mélange intramoléculaire de dianhydride d'acide tétracarboxylique, comprenant 50 à 99 % en moles de dianhydride d'acide benzophénone-3,3',4,4'-tétracarboxylique et 1 à 50 % en moles de dianhydride d'acide pyromellitique, est chauffée dans un solvant polaire aprotique et mélangée avec une quantité équimolaire de 2,4- et (ou) 2,6-toluènediisocyanate et (ou) méthylènebis(phénylisocyanate). Les polyimides mixtes de l'invention sont ininflammables, facilement solubles dans les solvants organiques, et offrent une bonne stabilité thermique.

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