Patent ID: 8552079

Claim:
A rigid flame retardant polyurethane foam which satisfies the requirements of ASTM E-84 for a Class I foam comprising the reaction product of: at least one polyisocyanate; with a polyol component comprising, from about 2 wt. % to about 35 wt. %, based on the weight of the polyol component, of at least one sucrose-based polyol, from about 2 wt. % to about 35 wt. %, based on the weight of the polyol component, of at least one non sucrose-based isocyanate-reactive compound, and from about 1 wt. % to about 13 wt. %, based on the weight of the foam, of at least one aromatic polyester polyol, in the presence of water, and optionally, at least one of carbon dioxide, surfactants, flame retardants, pigments, catalysts and fillers, with the proviso that the rigid polyurethane foam contains no trimethylolpropane-based polyols.