EPOXY RESINS BASED ON DIAMINOBISIMIDE COMPOUNDS

摘要

A method for the preparation of a diaminobisimide compound of formula (I) substantially free of oligomers, wherein Ar1 is an optionally substituted aromatic residue which provides for good conjugation between the nitrogen containing groups; and Ar is an optionally substituted aromatic residue characterized in that a t least two molar proportions of an aromatic dia- mine of the formula (II): H2N-Ar1=NH2 wherein Ar1 is as defined above, are heated with one molar proportion of an aro- matic tetracarboxylic acid of the formula (III): (HOOC)2Ar(COOOH)2, or the corresponding dianhydride, wherein Ar is as defined above, optionally in the presence of a polar solvent and optionally including 0.1 to 2 molar proportions of a tertiary amine. The compounds of formula (I) are useful curing agents in epoxy resin formulations.