| 摘要 |
PROBLEM TO BE SOLVED: To obtain a nonrigid polyurethane foam by foaming a specific polyol and an organic polyisocyanate in the presence of a blowing agent, etc., under specific conditions, excellent in air permeability, durability and impact resilience without deteriorating moldability and physical properties of foam. SOLUTION: This nonrigid polyurethane foam is obtained by reacting and foaming (A) a polyol such as a polyether polyol having 5-25 coefficient of resinification and 700-3,000 active hydrogen equivalent and (B) an organic polyisocyanate such as tolylene diisocyanate in the presence of a blowing agent such as water, a catalyst such as sodium acetate, a foam stabilizer such as a dimethylsiloxane-based foam stabilizer and (C) preferably 0.1-30 pts.wt. (based on 100 pts.wt. of A) of a compound prepared by modifying at least a part of the hydroxyl group of the component A into a group which is substantially nonreactive to isocyanate and has 9.5-20.0 solubility parameter (SP value). The component C is preferably the cyanoethylated substance or the cyanoisopyropylated substance of the component A. |
