Pentaerythritol Phosphate Derivatives as Flame Retardants for Polyolefins

摘要

A building block of our experimental char-forming flame retardants is pentaerythritol phosphate alcohol or PEPA. We present examples of the synthesis of several PEPA derivatives, notably bis-PEPA carbonate (BPC) and bis-PEPA PEPA-phosphonate (BP3). The syntheses are complicated by steric hindrance to reaction, and the choice of solvent and reaction conditions is important. All compounds can be formulated to give UL 94 V-0 flame retardant properties in polypropylene.