Abstract: A polyol combination having up to a total of about 100 parts by weight (1) from about 95.1 to about 99.9 parts by weight of a first polyol having a nominal average functionality higher than about 4.5, an equivalent molecular weight in the range of from about 1500 to about 2500, a hydroxyl value in the range of from about 25 to about 35 mg KOH/g and an ethylene oxide content in the range of from about 10 to about 30% by weight based on total weight of said first polyol, and (2) from about 0.1 to about 4.9 parts by weight of a second polyol having a nominal average functionality in the range of from about 2.2 to about 6, an equivalent molecular weight in the range of from about 1000 to about 3000 and an ethylene oxide content of at least 50% by weight based on total weight of said second polyol, wherein the polyol combination is essentially free of stably dispersed polymer particles.

Abstract: A process for preparing a soft flexible polyurethane foam by reacting (a) one or more organic polyisocyanates with (b) one or more polyols having a molecular weight in the range from about 400 to about 12,000, in the presence of (c) a catalyst, (d) a blowing agent, and (e), if desired, auxiliaries and/or additives, wherein the blowing agent (d) comprises water in admixture with about 0.01 to about 1 pbw, per 100 pbw polyol (b), of one or more non-crosslinked organic polyelectrolytes having a molecular weight in the range from about 1000 to about 20,000,000.