A new type of modified bismaleimide resin was obtained by copolymerization between tris(allylphenoxy)triazine monomer (TAPT) and an aromatic diamine-chain-extension bismaleimide [e.g., 4,4'-diaminodiphenylmethane (DADPM)-chain-extension 4,4'-bismaleimidodiphenylmeth-ane (BMDPM)]. The new three-component-polymer system had good processibility and mechanical properties. Better re-were obtained when the weight ratio of TAPT to the DADPM-chain-extension BMDPM resin was 30%. (C) 2004 Wiley Periodicals, Inc.