Abstract: Disclosed herein is a polyurethane foam for cushioning materials. The polyurethane foam is formed by reacting a mixture of a polyol component, a polyisocyanate component and other optional components. The polyol component contains a mixed polyol which is composed of a low-hydroxyl-number polyol having a hydroxyl number of 30-80 and a high-hydroxyl-number polyol having a hydroxyl number of 350-600 and has an average hydroxyl number of 120-170. The mixture may additionally contain a plasticizer component containing at least one kind of plasticizer having one active hydrogen atom per molecule.

Abstract: Process for preparing flame retarding polyurethane foams from a polyhydroxyl compound, diisocyanate mixture, a blowing agent, a catalyst and any other auxiliary agent if necessary, comprising mixing polyhydroxyl compound having at least two active hydrogen atoms per molecule, a molecular weight of 1,000 to 10,000 and wherein at least 10% by weight of the hydroxyl groups are primary hydroxyl groups, and a diisocyanate mixture containing 10 to 60% by weight of a modified diisocyanate prepared from the reaction of a diisocyanate compound expressed by the formula ##STR1## wherein X is an oxygen or sulfur atom.

Abstract: This invention relates to a process for preparing unshrinking, flexible, and flame retarding polyurethane foams from a polyhydroxyl compound, diisocyanate, a blowing agent, a catalyst and other auxiliary agents.