Abstract: It is to provide a method for producing a low-fuming rigid polyurethane foam, which is superior in initial activity at low temperature and requires a small amount of a stock liquid.A method for producing a rigid polyurethane foam, which comprises mixing (a) a polyisocyanate component with a polyol component comprising (b) a polyol mixture, (c) a catalyst and (d) a blowing agent, then foaming the mixture;wherein the polyisocyanate component (a) is polymethylenepolyphenyl polyisocyanate or a modified material thereof, the polyol mixture (b) comprises (b-1) an aromatic polyester polyol and (b-2) an aromatic polyether polyol; the catalyst (c) is at least one metallic catalyst; and the blowing agent (d) is an adduct of a primary or secondary amine compound with carbon dioxide.

Abstract: It is to provide a method for producing a low-fuming rigid polyurethane foam, which is superior in initial activity at low temperature and requires a small amount of a stock liquid.A method for producing a rigid polyurethane foam, which comprises mixing (a) a polyisocyanate component with a polyol component comprising (b) a polyol mixture, (c) a catalyst and (d) a blowing agent, then foaming the mixture;wherein the polyisocyanate component (a) is polymethylenepolyphenyl polyisocyanate or a modified material thereof; the polyol mixture (b) comprises (b-1) an aromatic polyester polyol and (b-2) an aromatic polyether polyol; the catalyst (c) is at least one metallic catalyst; and the blowing agent (d) is an adduct of a primary or secondary amine compound with carbon dioxide.