POLYESTER POLYOL, POLYURETHANE OBTAINED THEREFROM, AND RIGID POLYURETHANE FOAM

摘要

A polyester polyol which, when used as a starting-material polyol for polyurethanes, especially rigid polyurethane foams, not only has a low viscosity and satisfactory handleability but has high compatibility with blowing agents, especially an HFC blowing agent such as HFC-245fa and/or HFC-365mfc. The polyester polyol is one obtained by esterifying a polycarboxylic acid with alcohols, the alcohols containing 2 to 40 wt.% at least one member selected from the group consisting of 1-hydroxy-2-acetoxybutane, 1-acetoxy-2-hydroxybutane, and 1,2-diacetoxybutane.