| 摘要 |
<p>A polyurethane foam for a seat pad, obtained by expansion molding a foaming stock solution comprising: (A) a polyol component which comprises (a-1) 30 to 55 mass% of a polyether polyol consisting of a block copolymer that is obtained by ring-opening polymerization of ethylene oxide (EO) and propylene oxide (PO) and that has a molar ratio of EO repeating units to PO repeating units of 5/95 to 25/75 and a number-average molecular weight of 6,000 to 8,000 and (a-2) 2 to 20 mass% of a polyether polyol consisting of a block copolymer that is obtained by ring-opening polymerization of EO and PO and that has a molar ratio of EO repeating units to PO repeating units of 30/70 to 90/10 and a glass transition temperature of -65°C or lower; and (B) a polyisocyanate component. This polyurethane foam for a seat pad combines reduced shakiness and reduced stress relaxation, ensures a comfortable ride, is free from problematic shakes, and exhibits little hardness increase even under low-temperature atmosphere.</p> |
