FLAME RETARDANT HIGH DENSITY RIGID POLYURETHANE FOAMS

摘要

FLAME RETARDANT HIGH DENSITY RIGID POLYURETHANE FOAMS The invention pertains to flame retardant high density rigid polyurethane foams prepared by the reaction of an alkylene oxide adduct of toluenediamine or diaminodiphenylmethane with an organic polyisocyanate and a blowing agent wherein melamine is incorporated as the sole flame retardant compound. The amount of melamine is at least 5 percent by weight of the total composition.