| abstract |
The present invention provides a soft polyurethane foam which is obtained by expansion molding a starting foam liquid that contains a polyol, a polyisocyanate, a crosslinking agent, a foaming agent and a catalyst. This soft polyurethane foam is configured such that: a polyether polyol having a weight-average molecular weight (Mw) of 3,000 to 12,000 and 3.5 to 4 functional groups is contained therein as the polyol; the value of (ethylene oxide groups)/(propylene oxide groups) (in terms of a molar ratio) in all compounds contained therein as the crosslinking agent is 100 or more; a short-chain polyol having a weight-average molecular weight of 1,000 or less is contained therein as the crosslinking agent; and tolylene diisocyanate is contained therein as the polyisocyanate in an isocyanate index of 70 or more. |