Patent ID: 7540985

Claim:
A reaction injection molding process (RIM process) for producing a polyurethane molded article with a surface layer having a density of at least 0.8 g/cm 3 from (a) one or two polyisocyanate components, and (b) two polyol components, the method comprising: providing a molding machine which can feed distinctly the polyisocyanate component(s) and two polyol components; feeding a first polyurethane mixture liquid comprising a polyisocyanate component and a polyol component without a blowing agent into a mold with the molding machine; and for from 0.1 to 3.0 seconds prior to completion of feeding the first polyurethane mixture liquid, feeding a second polyurethane mixture liquid comprising a polyisocyanate component and a polyol component with the blowing agent into the mold, wherein the total duration of the first and second feeding steps is from 1.0 to 10.0 seconds.