| 摘要 |
PURPOSE:To provide a flexible polyurethane foam (especially slab stock foam) which does not scorch even when water alone is used as a blowing agent and has low density and excellent properties. CONSTITUTION:A process for manufacturing a flexible polyurethane under such conditions that (1) a polyether polyol having an average functionality of 2.5-4.5, an average equivalent weight of 500-1500 and a content of primary hydroxyl groups of at least 25% and/or said polyether polyol modified with an ethylenically unsaturated monomer are used as a polyol component, (2) at least 4.5 pts.wt. water is used per 100 pts.wt. said polyol, and (3) the NCO/OH equivalent ratio is 0.9 or below. |
