Patent ID: 8324289

Claim:
A flexible polyurethane foam obtained by reacting a high molecular weight polyoxyalkylene polyol or a polymer-dispersed polyol containing fine polymer particles in the high molecular weight polyoxyalkylene polyol, with a polyisocyanate compound in the presence of a catalyst, a blowing agent, a foam stabilizer, and a compound represented by the following formula (1) other than said foam stabilizer, wherein said compound is present in an amount of from 0.0001 to 0.0015 part by mass per 100 parts by mass of all active hydrogen compounds: wherein the average of n is from 13 to 2,100, and which flexible polyurethane foam has a core density of from 30 to 70 kg/m 3 , and wherein with respect to a flexible polyurethane foam obtained by foaming into a thickness of 100 mm, X (N/314 cm 2 ), which is the 25% hardness (ILD) measured in accordance with JIS K6400 (1997) and Y (mm), which is the value (difference in deflection on pressure side) obtained by subtracting the deflection on 500 N pressure side from the deflection on 900 N pressure side obtained from a load-deflection curve as measured by a pressure plate (Tekken Plate) in accordance with JIS E7104 (2002), satisfy a relation formula represented by the following formula (2): Y≧− 0.000370842 X 2 +0.225401 X− 10.5013 (2).