POLYOL COMPOSITION FOR HARD POLYURETHANE FOAM AND METHOD FOR PRODUCING HARD POLYURETHANE FOAM

摘要

A polyol composition for a hard polyurethane foam which contains at least a polyol compound, a blowing agent, a foam stabilizer and a catalyst and is mixed with an isocyanate component containing a polyisocyanate compound for blowing and curing, to form a hard polyurethane foam, characterized in that the blowing agent is 1,1,1,3,3-pentafluoropropane (HFC-245fa), and it further comprises at least one compatibilizer selected from the group consisting of DMA, NMP, GBL and MPA and 1,1,1,3,3-pentafluorobutane (HFC-365mfc) in respective specific amounts. The polyol composition uses HFC-245fa as a blowing agent and also is suppressed in the vapor pressure thereof.