novel amine terminated bisaspartimides , especially 4 , 4 &# 39 ;- bisphenyl ] aspartimido } diphenylmethane are prepared by a michael - type reaction of an aromatic bismaleimide and an aromatic diamine in an aprotic solvent . these bisaspartimides are thermally polymerized to yield tough , resinous polymers cross - linked through -- nh -- groups . such polymers are useful in applications requiring materials with resistance to change at elevated temperatures , e . g ., as lightweight laminates with graphite cloth , molding material prepregs , adhesives and insulating material .