| 摘要 |
PROBLEM TO BE SOLVED: To provide a polyurethane foam showing excellent modability without impairing split tear resistance even when the proportion of water is increased in order to lower the molding density. SOLUTION: This foam is obtained by reacting a compound having at least two isocyanate-reactive hydrogen atoms in the molecule and a molecular weight of 400-10,000 with a polyisocyanate in the presence of a foam stabilizer, water and a catalyst and has a ratio r1 /r2 of 0.02-0.80 (wherein r1 is the average diameter of the cells present on the surface part between the foam surface and the part which has a thickness of 5% of the entire foam thickness, and r2 is the average diameter of the cells present in the central part (a part covering 40-60wt.% of the entire foam thickness as measured from the foam surface). |
