Patent ID: 8318821

Claim:
A process for producing a rigid foamed synthetic resin, the process comprising: reacting a polyol (P) with a polyisocyanate (I) in the presence of a blowing agent, a foam stabilizer, and a catalyst, wherein the blowing agent comprises a C 2-8 hydrocarbon compound and water, wherein the polyol (P) comprises a polyesterpolyol (A) having a hydroxyl value of from 100 to 400 mgKOH/g, obtained by polycondensation of a monomer comprising an aromatic compound, a polyetherpolyol (B) having an average hydroxyl value of from 100 to 500 mgKOH/g, and a polymer-dispersed polyol (Z) having fine polymer particles (M) dispersed in a base polyol (W); wherein a content of the polyesterpolyol (A) in the polyol (P), based on 100 mass % of the polyol (P), is from 50 to 95 mass %, wherein a total content of the polyetherpolyol (B) and the polymer-dispersed polyol (Z) in the polyol (P), based on 100 mass % of the polyol (P), is from 5 to 50 mass %, wherein a mass proportion of the fine polymer particles (M) to a total mass (100 mass %) of the polyetherpolyol (B) and the polymer-dispersed polyol (Z) is from 0.02 to 10 mass %, wherein a isocyanate index of the polyol (P) and the polyisocyanate (I) is over 200 and at most 400; and wherein the polyol (P) has an average hydroxyl value of from 100 to 450 mgKOH/g.