| 摘要 |
<p>In one aspect the invention is a flexible polyurethane foam composition prepared from a formulation comprising (1) an organic polyisocyanate, (2) an isocyanate-reactive component, (3) a catalyst, and (4) a foam stabilizing agent. Foam stabilizing agents can be, (a) alkali metal dihydrogen phosphates and polyphosphates; (b) alkali metal sulfates; (c) aluminum sulfates, phosphates, polyphosphates, borates and alkanoates; (d) ammonium sulfates, phosphates, polyphosphates, borates and alkanoates; (e) acid chlorides; or (f) mixtures thereof. Preferably the isocyanate-reactive component has an average nominal functionality greater than or equal to 3 and the formulation is processed at an isocyanate index of from 80 to 130, preferably 85 to 100. In another aspect the invention is a foam prepared from a similar formulation, using the same relatively high functionality isocyanate-reactive component and reduced index, but without the foam stabilizing agent. Advantages are improved processability and physical properties, including tensile strength, tear resistance and resiliency, even when the formulations use water as a sole blowing agent.</p> |
