Patent ID: 7556756

Claim:
In a reaction injection molding process (RIM process) for producing a polyurethane foam molded article with a surface layer from a polyisocyanate compound, a polyol mixture comprising a polyol, a catalyst and a crosslinking agent, and a blowing agent, the improvement comprising arranging a molding machine capable of providing the polyisocyanate compound, the polyol mixture and the blowing agent such that, when the polyisocyanate compound, the polyol mixture and the blowing agent are continuously injected, the injection initiation of the blowing agent is delayed from injection initiation of the polyisocyanate compound and polyol mixture and wherein the quantity of polyisocyanate compound and the polyol mixture, to be fed before the injection initiation of the blowing agent, is from about 10 to about 50 weight % of the total quantity of polyisocyanate compound and the total quantity of polyol mixture, respectively and wherein the time from the injection initiation of the polyisocyanate compound and the polyol mixture to the injection initiation of the blowing agent is from 0.1 to 3.0 seconds.