| 摘要 |
PROBLEM TO BE SOLVED: To provide a method for manufacturing rigid polyurethane foam having improved thermal conductivity and a composition for the rigid polyurethane foam. SOLUTION: In producing a rigid polyurethane foam by use of a composition comprising an aromatic polyisocyanate, a polyol, a foaming agent, a catalyst, a foam controlling agent and other additives, the foaming agent is a blend of cyclopentadiene and water and the polyol contains a polyether polyol obtained by addition polymerization of an alkylene oxide using of o-toluenediamine as an initiator.
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