PHOSPHORUS-CONTAINING EPOXY FOR FLAME-RETARDANT .3. USING PHOSPHORYLATED DIAMINES AS CURING AGENTS

Two phosphorus-containing diamine compounds, bis(4-aminophenoxy)-pheny l phosphine oxide and bis(S-aminophenyl) phenyl phosphine oxide, were synthesized for use as curing agents of epoxy resins. Phosphorylated e poxy resins were obtained by curing Epon 828 and Eponex 1510 with thes e two diamine agents. For raising the phosphorus contents of the resul ting epoxy resins, the phosphorus-containing epoxy, bis(glycidyloxy)ph enyl phosphine oxide (BGPPO), was also used. These two diamine agents showed similar reactivity toward epoxies. Their reactivities were high er than DDS and lower than DDM. High char yields in TGA evaluation wer e found for all the phosphorylated epoxy resins, implying their high f lame retardancy. The excellent flame-retardant properties of these pho sphorylated epoxy resins were also demonstrated by the high limiting o xygen index (LOI) values of 33 to 51. (C) 1997 John Wiley & Sons, Inc.