| 摘要 |
A process for producing a foamed polyurethane or polyisocyanurate by reacting a polyol with a polyisocyanate compound in the presence of a blowing agent, characterized by using as the blowing agent a mixture comprising 51 to 90 wt.% 1,1,1,3,3-pentafluoropropane and 49 to 10 wt.% 1, 1,1,3,3-pentafluorobutane.
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