| 摘要 |
PROBLEM TO BE SOLVED: To provide the polyurethane foam for a speaker edge with excellent properties such as tensile strength, elongation, hardness or the like after compression forming especially, excellent moisture-proof and heat aging characteristics and ozone deterioration immunity or the like and excellent water cut-off characteristic. SOLUTION: A polymer polyol including at least a polyester polyether polyol and a polymer polyol including a stylene component is used for the polyol, and the polyol component blended with a foaming agent, a catalyst, and a foam stabilizer and a polyisocianate or the like are reacted to obtain the polyurethane foam for a speaker edge with excellent tensile strength and elongation or the like after compression forming. Furthermore, a specific aromatic secondary amine group chemical compound and an ultraviolet ray absorbing agent are blended to obtain a form with excellent ozone deterioration resistance and weatherability characteristic. Moreover, a specific terminal monofunctional chemical compound such as mono alcohol or a mono isocianate is blended to reduce a water absorbing rate and a gas permeability to obtain the polyurethane foam for a speaker edge with excellent water cut-off performance. |
