Yasuo Kurachi

Synthesis and properties of urethane foams having a N3P3 ring compound

To prepare the flexible and non-flammable urethane foam, the product formed by the reaction of 1,1-diamino 3,3,5,5-tetraphenoxycyclotriphosphazene, N3P3 (NH2)2 (OC6H5)4, and TDI-80 consisted of 80% 2,4-tolylenediisocyanate and 20% 2,6-tolylenediisocyanate was carried out with polyol(PPG-BM: (oxypropyrene)triol;Mw=3000, hydroxyl number 56) and water in the presence of various concentrations of amine (triethylenediamine) and tin (dibutyltin dilaurate) catalysts. The foam without shrinkage was obtained with 0.1 to 0.2g amine and 0.3 g tin catalysts. It had a limiting oxygen index value of 21 and the tensile strength and elongation of the foam were about 0.075 MPa and 140%, respectively. However, theTg of the foam estimated from tan δ was −24°C and this was almost the same value as that of the foam without N3P3 ring compounds.