Polyurethane foam and method for manufacturing the same

A polyurethane foam obtained by reacting, foaming, and curing a raw material which comprises a polyol, a polyisocyanate, a blowing agent, a catalyst, and an inorganic compound hydrate,

• wherein the raw material contains, as the polyol, a polymeric polyol obtained by graft polymerization of a vinyl monomer onto a polyether polyol and a polyether polyol obtained by addition polymerization of an alkylene oxide to a polyhydric alcohol and having a mass average molecular weight of 400 to 1,000,
• wherein the polyisocyanate comprises tolylene diisocyanate,
• wherein the inorganic compound hydrate is a hydrate of a sulfate or phosphate and wherein the blending quantity of the inorganic compound hydrate is 10 to 80 parts by mass per 100 parts by mass of the polyol, wherein the polyurethane foam has hot press moldability, and
• wherein the polyurethane foam has an apparent density of from 14 to 20 kg/m3, and a hardness of from 15 to 25 kPa.

A method for manufacturing a polyurethane foam comprising:

• preparing polyurethane foam raw material that contains a polyol, a polyisocyanate, a blowing agent, a catalyst, and an inorganic compound hydrate;
• and
• producing a polyurethane foam by reacting, foaming, and curing the raw material,
• wherein the raw material contains, as the polyol, a polymeric polyol obtained by graft polymerization of a vinyl monomer onto a polyether polyol and a polyether polyol obtained by addition polymerization of an alkylene oxide to a polyhydric alcohol and having a mass average molecular weight of 400 to 1,000, and
• wherein the blending quantity of the inorganic compound hydrate is 10 to 80 parts by mass per 100 parts by mass of polyol,
• wherein a resultant polyurethane foam has an apparent density of from 14 to 20 kg/m3, and a hardness of from 15 to 25 kPa.