| abstract |
Flexible polyurethane foams having a density lower than 21 Kg/m³ obtained, without expanding agents of the chlorofluoroalkanic type, by the polycondensation of an isocyanic prepolymer with a polyolic composition including a polyol, with an equivalent weight higher than 500, water and an additive for processability composed of a cross-linking/chain-lengthening agent having a low molecular weight and, optionally, a cell-opening agent. |