High load bearing flexible polyurethane foams

Claim 1

In the process for the preparation of a flexible polyurethane foam by reacting a mixture comprising a polyol, an organic polyisocyanate, a blowing agent, a surfactant, and a catalyst for the urethane reaction, the improvement wherein the polyol component is a mixture of 95 to 75 weight percent of a polyol having a functionality of about 1.5 to about 3.0 with a hydroxyl number of about 25 to about 60 and 5 to 25 weight percent of a hydroxyl compound-modified benzyl ether-containing resole polyol obtained by the metal carboxylate catalyzed reaction at 100° C. to 130° C. of a phenol or mixture of phenols, a molar excess relative to the phenolic component of a non-aqueous aldehyde having 1 to 6 carbon atoms, and a modifying amount of an aliphatic hydroxyl compound having 1 to 4 hydroxyl groups, 1 to 12 carbon atoms, and 0 to 5 ether oxygen atoms.