Process for the preparation of white graft polymer dispersions and flame-retardant polyurethane foams

摘要

White graft polymer dispersions in polyoxyalkylene polyether polyols are employed together with flame retardant compounds to prepare flame retardant polyurethane foams. The polymer dispersions employ less than 0.1 mole of induced unsaturation per mole of polyol mixture. Improved processes for the reparation of these polymer dispersions employ either isomerized maleate containing polyetherester polyols or polyetherester polyols prepared by reacting a polyoxyalkylene polyether polyol, a polycarboxylic acid anhydride and an alkylene oxide in the presence of salts and oxides of divalent metals.