The reaction of diaminotetraalkoxy- and aryloxycyclotriphos-phazene with toluendiisocyanate (TDI) was investigated in various solvents. It was found that benzene or electron negative groups such as the trifluoroethoxy group (-OCH2CF3) were the most suitable solvents for the growing of molecules having an N3P3ring. The adhesive property of the products to a hard polyvinyl chloride laminate was studied by bonding strength measurements. The product formed from the reaction of diaminotetramethoxy-cyclotriphosphazene with TDI had the strongest adhesive strength even though it had the low molecular weight.