| abstract |
PROBLEM TO BE SOLVED: To provide a flexible polyurethane foam excellent in moisture heat aging resistance, ozone deterioration resistance and the like, and a loudspeaker edge using the foam which is excellent in waterproofness and the like. SOLUTION: As the polyol, a polyester polyol having excellent compatibility with a polyether polyol such as adipate of a long-chain alkylene glycol having 5 or more carbon atoms or the like is used, and a foaming agent, a catalyst, a foam stabilizer and the like are blended with the polyester polyol. The resulting polyol component is reacted with a polyisocyanate to obtain a flexible polyurethane foam having good resistance to humid heat aging and ozone deterioration. In addition, a specific aromatic secondary amine compound, a terminal monofunctional compound and an ultraviolet absorber are blended to obtain a flexible foam having more excellent ozone deterioration resistance and weather resistance. Further, a speaker edge made of this flexible foam, having a small decrease in strength and elongation due to compression molding or the like and having particularly excellent waterproofness, weather resistance and the like is obtained. |