Halogen-free, flame retardant rigid polyurethane foam and its preparation process

摘要

A halogen free, flame resistant, rigid polyurethane foam (I) contains a mixture of oxalkylated alkylphosphonic acids and ammonium polyphosphate flame retardant (II). An Independent claim is included for a process for the production of the foam (I) by the reaction of polyisocyanates and polyols in the presence of blowing agent, stabilizer, activator and flame retardant (II).