| abstract |
The present invention discloses that as the reaction product of an isocyanate component and an isocyanate reactive component in the presence of a blowing agent, an initial UL 94 vertical flame rating of V-0 and a V- after one week of heat aging at 150°C are formed 0 UL 94 vertical flame rating for polyurethane foam. The isocyanate component includes an isocyanate group-containing compound and a non-reactive phosphorus compound, the non-reactive phosphorus compound being present in an amount of 1 to 20% by weight, based on the total weight of the polyurethane foam. The isocyanate-reactive component includes a polyether polyol and expandable graphite, the expandable graphite being present in an amount of 3 to 30 weight percent based on the total weight of the polyurethane foam. |