| abstract |
A vapor pressure reducing agent for polyurethanenfoam, comprising at least one compound represented by thenfollowing formula (1):n nwherein R 1 , R 2 and R 3 represent a straight-chain alkylngroup or branched-chain alkyl group having 2 to 5 carbonnatoms, R 1 , R 2 and R 3 may be the same or different, with thenproviso that the compound wherein R 1 , R 2 and R 3 are allnethyl groups is excluded, the compound having a total acidncontent of 650 mg KOH or less as measured in accordancenwith MIL H-19457; and a premix composition for producingnpolyurethane foam, comprising a polyol, a curing catalyst,n1,1,1,3,3-pentafluoropropane, a foaming stabilizer, andnthe vapor pressure reducing agent described above. |