| 摘要 |
PROBLEM TO BE SOLVED: To provide a hard polyurethane foam excellent in brittleness, compression strength and heat conductivity even by using only water as a foaming agent without using a low boiling point organic solvent accompanying a risk of breaking a fire. SOLUTION: This method for producing the hard polyurethane foam by the reaction of an organic polyisocyanate with the polyol component by using water as the foaming agent in the presence of a catalyst is provided by using the polyol component containing 5-40 wt.% polyesterpolyol having at least≥3 number of functional groups having active hydrogen per 1 molecule based on the whole polyol component and also having 100-600 mgKOH/g mean hydroxy group value of the whole polyol component. COPYRIGHT: (C)2004,JPO |
