PURPOSE:To obtain the titled foam having excellent physical properties and suitable as a sealing material and sound-proofing vibration-damping material, by introducing a foaming raw material for polyurethane foam into a stirring and mixing chamber of a foaming machine, supplying molten hot asphalt thereto and foaming the mixture. CONSTITUTION:A foaming raw material containing (A) a polyoxyalkylene polyol and (B) an organic isocyanate as single component or as a prepolymer and, if necessary, (C) a foaming agent, (D) a catalyst, etc., is introduced into a stirring and mixing chamber of a foaming machine. Simultaneous to the above, (E) preferably 80-120pts.wt. (based on 100pts.wt. of the component A) of molten hot asphalt is supplied to the stirring and mixing chamber and the obtained mixture is extruded and foamed to obtain the objective foam. The asphalt E is preferably the one having a penetration of =60 and the temperature of the asphalt supplied to the stirring and mixing chamber is preferably 100-120 deg.C.
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