Flexible polyurethane foams having low resistance to air flow and method for preparation

The method of forming a flexible polyurethane foam characterized by its low resistance to air flow, high load bearing characteristics and high strength comprising the steps of (1) foaming a flexible polyurethane foam by reacting a polyisocyanate, a polyol blend including from about 40-60 percent by weight of a polyether triol having an average molecular weight of about 4500 to about 6500 and from about 60-40 percent by weight of a reinforced polymer polyol having an average molecular weight of about 4500 to about 5500, said reinforcing of said polyol being through the addition of a stable dispersion of a vinyl polymer to said polyol in an amount of from about 10 to 30 percent by weight of the polymer polyol;

• and a low molecular weight cross-linking agent selected from the group consisting of 1,4-cyclohexanedimethanol and 4,4'methylene-bis (2-chloroaniline);
• and (2) while said flexible polyurethane foam is in the "green" uncured state, compressing said foam in at least one direction to about 80 to 95 percent of the height of the block of foam.