Patent ID: 7759403

Claim:
A flexible polyurethane foam obtained by reacting a polyol composition with a polyisocyanate compound in the presence of a catalyst, a blowing agent and a foam stabilizer, wherein the polyol composition comprises a high molecular weight polyoxyalkylene polyol (A1), and a polymer-dispersed polyol (A2) containing fine polymer particles in the high molecular weight polyoxyalkylene polyol (A1), and at least part of the fine polymer particles contained in the polymer-dispersed polyol (A2) are fine polymer particles having silicon atoms, 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 (5): Y ≧-0.000370842 X 2 +0.225401 X -10.5013 (5), wherein the fine polymer particles having silicon atoms are fine polymer particles obtained by polymerizing a monomer comprising a silicon-containing acrylate or a silicon-containing methacrylate.