Blends of polyurethane and polyphosphazene and their use as flame-retardant foamed compositions

摘要

Flame-retardant polymer blends of a polyurethane polymer or prepolymer and a poly(organophosphazene) are disclosed. Preferred poly(organophosphazenes) contain functional groups capable of reacting with isocyanate groups present during the curing of the polyurethane. The blends are preferably formulated by reacting the poly(organophosphazene) containing functional groups under conditions where some of the functional groups of the poly(organophosphazene) can react with the isocyanate groups present during the polymerization and curing of the polyurethane. These polymer blends are useful for making flame-retardant foamed articles of manufacture.