| 摘要 |
PROBLEM TO BE SOLVED: To provide an inexpensive speaker edge material in which a conventional versatile polyol can be used, and which is superior in water stopping and mechanical characteristics.SOLUTION: The speaker edge material is formed of a polyurethane foam formed by foam molding a foaming stock solution including polyol, isocyanate, a foaming agent and a foam stabilizer. The speaker edge material is characterized in that: the polyol contains PPG polyol; the isocyanate is TDI isocyanate; and the foam stabilizer includes silicone having a group reactive to polyol or isocyanate. |
