摘要 |
PURPOSE:To obtain a polycarbonate polyol useful for obtaining a polyurethane excellent in hydrolysis resistance, heat resistance, weathering resistance and mechanical strengths by selecting a polycarbonate polyol obtained by the transesterification between a polycarbonate diol and a specified compound. CONSTITUTION:A polycarbonate polyol obtained by the transesterification among a polycarbonate diol (e.g. CD220, a product of Daicel Kagadu Kogyo) and a triol compound (e.g. trimethylolpropane) and/or a tetraol compound (e.g. pentaerythritol) is selected. |