| abstract |
A polyurethane foam having a uniform foam structure, which can improve the flatness and flattening efficiency of a surface to be polished, has a small change in hardness during polishing, and is useful as a polishing pad. To provide a polyurethane foam. The content of a nitrogen atom derived from an isocyanate group obtained by reacting a polymer polyol, an organic diisocyanate and a chain extender in which 50 mol% or more is 1,4-cyclohexanedimethanol is 6 wt% or more. There, and made of polyurethane storage modulus E '70 is 7 × 10 9 dyn / cm 2 or more at 70 ° C., density 0.5 to 1.0 g / cm 3, cell size 5 to 200 [mu] m, the hardness ( A polyurethane foam having a JIS-C hardness of 90 or more. [Selection diagram] None |