Halogen-free flame retardant copolyesters( PES) hot melt adhesive was prepared using an intumescent flame retardant( n-IFR) system consisting of ammonium polyphosphate( APP) and novel triazine charring-foaming agent( CFA),and zeolite 4A as a synergistic agent. The effect of the n-IFR content on flame retardancy of PES and synergistic effect between n-IFR and zeolite 4A were studied. It is found that a little quantity of zeolite 4A can promote flame retardant effect of n-IFR to PES. When the IFR content is 2...