| 摘要 |
PROBLEM TO BE SOLVED: To provide a rigid polyurethane foam having excellent open-cell properties, and a vacuum heat insulation material including a core material composed of the rigid polyurethane foam.SOLUTION: A polyisocyanate component and an active hydrogen group-containing component are reacted with each other to foam, in the presence of thermoplastic resin fine particles composed of branched polyolefin, in order to obtain a rigid polyurethane foam, and further obtain a vacuum heat insulation material including a core material composed of the rigid polyurethane foam. |
