FLAME-RETARDANT AGENTS STABLE TO HYDROLYSIS, BASED ON AMMONIUM POLYPHOSPHATE

摘要

HOE 85/H 027 JKFLAME-RETARDANT AGENTS STABLE TO HYDROLYSIS, BASED ONAMMONIUM POLYPHOSPHATEABSTRACT OF THE DISCLOSUREA microencapsulated flame-retardant agent stable tohydrolysis, based on free flowing, pulverulent ammoniumpolyphosphate of the general formulaH(n-m)+2(NH4)mPnO3n+1in which n stands for an integer with an average value ofabout 20 to 800 and the ratio of m/n is about 1, consistssubstantially ofa) about 75 to 99.5 mass % ammonium polyphosphate andb) about 0.5 to 25 mass % of a reaction product of apolyisocyanate and water, the resulting polyureaencapsulating the individual ammonium polyphosphateparticles.