| abstract |
A polyol composition for rigid polyurethane foams, which is used in combination with HFC-245fa as a blowing agent at a reduced vapor pressure of the blowing agent. The blowing agent ingredient comprises 1,1,1,3,3-pentafluoropropan (HFC-245fa). The composition comprises diethylene glycol monoethyl ether acetate and one or more polyol compounds including a polyol compound having a tertiary amino group, wherein the content of nitrogen atoms assignable to the tertiary amino is 0.5 to 9 wt.% based on the polyol compounds. Use of the blowing agent ingredient which further includes HFC-365mfc or HFE-254pc is also preferable. |