Patent ID: 7947756

Claim:
Process for making a slabstock, visco-elastic, flexible, polyurethane foam which process comprises reacting a polyisocyanate and a polyol at an index of 60-95 and using a blowing agent, wherein the polyol is a polyol composition comprising b1) a polyoxyethylene-polyoxypropylene polyol, having an average nominal hydroxy functionality of 2-4 and an average equivalent weight of 1000-3000, wherein the oxyethylene (EO) is present as tipped EO and/or random EO, the total EO content being 50-90% by weight; b2) a polyoxyethylene-polyoxypropylene polyol, having an average nominal hydroxy functionality of 2-4 and an average equivalent weight of 1000-3000, wherein the EO is present as random EO and/or tipped EO, the total EO content being between 5 and 25% by weight; and b3) castor oil; and optionally b4) a polyoxypropylene polyol, having an average nominal hydroxy functionality of 3-6 and an average equivalent weight of 100-600; and optionally b5) a polyoxyalkyleneglycol having an average molecular weight from 150 to 1200; the amounts of these compounds b1, b2, b3, b4 and b5 being (based on the combined weights of b1, b2, b3, b4 and b5): b1: 10-40 wt %, b2: 10-40 wt %, b3: 5-50 wt %, b4: 0-40 wt %, b5: 0-30 wt %.