| 摘要 |
Flexible polyurethane foam having excellent heat and humidity aging characteristics and suitably used as a material for an edge member of a diaphragm of a speaker is obtained by mixing a raw material containing a hydroxyl compound, a polyisocyanate, a foaming agent, a foam stabilizer, and a catalyst and forming the mixture. The flexible polyurethane foam has a molar ratio of urea bond relative to urethane bond of 7 or less. |
