| 摘要 |
Provided is a polyurethane foam for a seat pad which simultaneously achieves higher levels of shakiness-reducing properties and stress relaxation-reducing properties, thus providing a comfortable ride and thus having no problem of shakiness, and which exhibits only a small increase in the hardness under low-temperature environment (for example, 5°C or less). Specifically, provided is a polyurethane foam for a seat pad produced by foam-molding a foaming liquid containing (A) a polyol component and (B) a polyisocyanate component, wherein the polyol component (A) includes, based on said polyol component, 30% to 55% by mass of (a-1) a polyether polyol, wherein said polyether polyol (a-1) is a block copolymer obtained through ring-opening polymerization of ethylene oxide (EO) and propylene oxide (PO), and has a molar ratio of repeating units derived from EO to repeating units derived from PO of 5/95 to 25/75 and a number average molecular weight of 6, 000 to 8, 000, and the polyol component (A) further includes, based on said polyol component, 2% to 20% by mass of (a-2) a polyether polyol, wherein said polyether polyol (a-2) is a block copolymer obtained through ring-opening polymerization of EO and PO, and has a molar ratio of repeating units derived from EO repeating unit derived from PO of 30/70 to 90/10 and a glass-transition point of -65°C or less. |
