| abstract |
The invention relates to a method for manufacturing flexible polyurethane foams of high firmness.n n n This process is carried out from a foaming composition prepared by mixing organic polyisocyanates, catalysts, blowing agents, polyether polyols as well as from 0.1 to 30% by weight and, preferably, from 3 to 15% by weight relative to the polyether polyols, of one or more hydroxylated resins based on ketone-formaldehyde condensates.n n n The method of the invention is particularly applicable to the manufacture of polyurethane foams of high elasticity also endowed with high firmness properties. |