Polyurethane and urethane-modified isocyanurate foams and a polyol composition useful in their preparation

Claim 1

A rigid foam comprising the reaction product of a foamable reaction mixture comprising a blowing agent, a polyisocyanate and at least two active hydrogen-containing compounds reactive with an isocyanate, one of said active hydrogen-containing compounds being an alkylene oxide polymer having a hydroxyl number of about 20-110 and being composed of at least about 10 weight percent, based on the total weight of the polymerized alkylene oxide in the polymer, of a polymerized ethylene oxide, and said other active hydrogen-containing compound containing from 2 to 8 active hydrogens and a hydroxyl number of at least 100, and wherein said alkylene oxide polymer is present in an amount from 5 to 95 weight percent of the active hydrogen containing compounds in the reaction mixture, and said other active hydrogen-containing compound is present in an amount from 95 to 5 weight percent of the active hydrogen containing compounds in the reaction mixture.