| abstract |
The present invention relates to a process for making a flame retardant polyurethane foam which comprises reacting a reaction mixture consisting essentially of a propylene oxide-based polyol that is essentially free of ethylene oxide moieties, a polyisocyanate, melamine in an amount of between about 5 and about 55 parts by weight per hundred parts of the polyol, a halogenated phosphate supplemental flame retardant in an amount of between 8 and about 50 parts by weight per hundred parts of the polyol, and water in an amount of between about 3 and about 6 parts by weight per hundred parts of the polyol, said polyol being further characterized by a molecular weight of between about 2,500 and about 6,000, to provide a polyurethane foam characterized by enhanced flame retardancy. |