| 摘要 |
<p>A polyurethane foam formulation for spraying onto the side walls of moulds is provided. The polyurethane foam formulation comprises (a) a polymer polyol having a viscosity in the range of 3,000 to 8,000 cps at 25 DEG C, (b) an isocyanate selected from toluene diisocyanate; di(4-isocyanatophenyl)methane; or derivatives thereof, (c) a catalyst for the polyurethane forming reaction comprising an amine or a tin derivative and (d) a blowing agent wherein the foam formulation has an index of from 80-120.</p> |
