| 摘要 |
PROBLEM TO BE SOLVED: To obtain a polyurethane foam having excellent dimensional stability by foaming and curing a polyurethane foam composition containing a polyisocyanate and a mixture prepared by adding hydrophobic silica-based particles to a resin premix which comprises a polyol, or the like, and has excellent storage stability. SOLUTION: This polyurethane foam is obtained by foaming and curing a polyurethane foam composition containing (C) a polyisocyanate and a mixture prepared by adding (B) hydrophobic silica-based particles which preferably have a particle diameter of 0.1-1μm and preferably contain 1-30 mol.% of R13SiO1/2 units (R1 is a 1-6C monovalent hydrocarbon group), 0.1-20 mol.% of R2SiO3/2 units (R2 is a 1-20C monovalent hydrocarbon) and 70-99 mol.% of SiO2 units to (A) a resin premix comprising a polyol (for example, polyethylene glycol), water, a catalyst (for example, tetramethylhexmethylene diamine), and a surfactant. |
