| 摘要 |
<p>A process for preparing a polyurethane foamed article comprising a hard foam encapsulated by a soft foam. The process provides improved encapsulation by frothing the hard foam formulation, with for example carbon dioxide, before it is introduced onto the rising soft foam formulation. The hard foam formulation is frothed so that its density is between 75% and 145% of the soft foam formulation.</p> |
