Dibasic acids containing a pyromellitimide ring were synthesized by the reaction of pyromel-litic dianhydride with such ω-aminoacids as glycine, ε-amino-caproic acid and p-amino-benzoic acid. By the condensation polymerization of the dibasic acids obtained above with diamines, polypyromellitimide-amides were synthesized. The polymers were soluble in m-cresol and sulfuric acid, and the inherent viscosities of the polymers ranged from 0.21 to 0.42 (in m-cresol). The polymers were found to be considerably heat-stable.
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Saga et al. (1966) studied this question.
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